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Pollination Ecology and Floral Evolution in Rocky Mountain Wildflowers

Explores how pollinators, seed predators, and outcrossing dynamics drive floral trait evolution and population genetic structure in Rocky Mountain plant communities, combining field experiments, electrophoresis, and null-model statistics.

Diane R. CampbellNickolas M. WaserMary V. Priceoptimal outcrossing distancefixation indicesmultidimensional phenospaceData from: Genetic and spatial variation in vegetaData from: Comparative impacts of long-term trendsData from: Is plant fitness proportional to seed sStarch gel electrophoresis (Polemoniaceae)Null model permutation testingTransect-based seed sampling for plant population genetics (Ranunculaceae)Selection of floral traits by pollinators and seedCompetition for hummingbird pollination and sequenFloral larceny: Implications, resistance, and the

Knowledge Graph (740 nodes, 3862 connections)

Research Primer

Background

Pollination ecology examines how flowering plants and their animal visitors — bees, hummingbirds, flies, moths, butterflies, and others — interact to move pollen between flowers, and how those interactions shape the evolution of floral traits like color, scent, shape, and nectar. The subalpine meadows around Gothic, Colorado, in the Gunnison Basin have been one of the world's most productive natural laboratories for this research for more than half a century. Wildflowers here bloom in a short, intense season tied to snowmelt, and their reproduction depends almost entirely on animal pollinators. Understanding those relationships matters for predicting how meadows will respond to climate change, for informing land stewardship, and for conserving the pollinators themselves.

A handful of ideas recur throughout the findings below. Pollination syndromes are the traditional notion that a flower's traits (for example, red tubular corollas with dilute nectar) predict its pollinator (for example, hummingbirds). Floral larceny refers to visitors such as nectar robbers that take nectar without transferring pollen, often by piercing the base of the flower. Plant-pollinator networks are maps of who visits whom in a community; link rewiring describes how those connections reshuffle through the season even when the same species are present. Optimal outcrossing distance captures the idea that pollen moved too short or too far a distance can both reduce seed success, favoring an intermediate mating range. Reciprocal hybridization is the experimental technique of crossing two species in both directions to separate maternal (cytoplasmic) from paternal effects, an important tool in the long-studied Ipomopsis aggregata by I. tenuituba hybrid zone near Gothic.

Other concepts appear in more specialized findings. Cognitive ecology asks how pollinator learning and memory shape foraging choices and, indirectly, plant evolution. Buzz pollination is the vibration bees use to shake pollen from tubular anthers. Antagonistic selection arises when different visitors (say, pollinators and seed predators) favor opposite trait values. And reproducible research practices — shared data and standardized protocols — have become a methodological frontier, especially in the chemistry of floral scent.

Foundational work

Decades of research at RMBL established the basic vocabulary of the field. Inouye's experimental removal of bumble bees showed that Bombus species partition flowers by matching tongue length to corolla depth, a classic demonstration of competitive resource partitioning (Inouye, 1978). In the same year, Waser showed that sequentially flowering Delphinium nelsonii and Ipomopsis aggregata compete for shared hummingbird pollinators, with overlap reducing seed set through interspecific pollen transfer (Waser, 1978). Pyke formalized bumble bee movement within and between inflorescences as optimal foraging (Pyke, 1978), while Inouye provided the standard terminology still used for nectar robbing and other forms of floral larceny (Inouye, 1980).

A second wave of foundational papers tackled plant mating and pollen transfer. Price and Waser demonstrated an optimal outcrossing distance in Delphinium nelsonii, showing that crosses between very close or very distant parents produced fewer viable offspring than intermediate crosses (Price & Waser, 1979). Harder and Thomson showed that bumble bees deposit only a tiny fraction of the pollen they remove from Erythronium grandiflorum, establishing that floral traits can evolve to package and dispense pollen across many visits (Harder & Thomson, 1989). Campbell and Halama experimentally separated pollen and resource limitation of seed set in I. aggregata, showing both can operate simultaneously (Campbell & Halama, 1993). Waser and colleagues then challenged the strict pollination syndrome view, arguing that most real pollination systems are more generalized and dynamic than textbook categories suggest (Waser et al., 1996).

Key findings

One of the strongest conclusions to emerge is that pollination syndromes — the idea that flower traits cleanly predict pollinators — are weaker than textbooks imply. A global test found that only about 1–6% of 482 species fell within a predicted syndrome cluster, and syndromes correctly predicted the main pollinator in only about a third of cases (Ollerton et al., 2009). Generalization is the rule, and visitor identity matters: pollen-collecting bees remove roughly twice as much pollen as nectar-collecting bumble bees but deposit an order of magnitude less on stigmas (Thomson & Thomson, 1991). Even apparent cheaters are ambiguous. Nectar robbers often pollinate the flowers they rob, and their net effects on plants can be positive, neutral, or negative depending on context (Maloof & Inouye, 2000), with strong negative impacts concentrated in pollen-limited, self-incompatible species and under heavy robbing intensity.

A second theme is the dynamism of plant-pollinator communities. Although the species list in a meadow can appear stable, week-to-week turnover of interactions is high and dominated by rewiring — species reshuffling which partners they visit — rather than species coming and going (CaraDonna et al., 2017). Network properties vary widely across the season in ways that are invisible in cumulative, season-long networks (Cuartas-Hernández et al., 2020). Experimental removals show why this flexibility matters: losing a single pollinator species reduces the floral fidelity of the remaining pollinators and cuts plant reproduction, even when other effective pollinators remain (Brosi & Briggs, 2013). Removing flowers of a dominant generalist like Helianthella reduces community-wide pollinator visitation by nearly half (Ogilvie & Forrest, 2022).

A third theme is the role of climate and water. Hummingbird visitation to Ipomopsis aggregata declines with reduced winter snow inputs, tightening pollen limitation in drier years (Brookes et al., 2016). Plants produce more seeds in years with later snowmelt, and projected earlier snowmelt is expected to cause population decline in I. aggregata (Campbell & Powers, 2019). Under drought, networks can both contract and expand: visitor abundance at I. aggregata was more than four times higher in drought years (Campbell et al., 2021), and drought networks showed higher connectance and more links per species (Ogilvie et al., 2022). These climate effects feed back into evolution. Floral traits in the Ipomopsis hybrid zone show measurable change across generations consistent with phenotypic selection (Campbell et al., 2018), and floral traits have substantially higher heritability than vegetative traits, giving them stronger evolutionary potential (Campbell et al., 2022).

Current frontier

Early work from the 1970s through the 1990s established foraging, competition, and mating-system foundations. Work since 2020 has shifted strongly toward how climate change alters floral traits, rewards, and interactions. Experimental warming with open-top chambers reduces pollinator visitation to Delphinium and Potentilla by more than 80% (Bergman et al., 2021) and increases Ipomopsis nectar production by 41% while subtly changing floral scent (Wu et al., 2025). Manipulations of snowmelt timing and summer precipitation show that floral volatile emissions respond to these shifts and that natural selection on scent itself changes with the environment (Powers et al., 2025). Temperature and humidity together shape nectar volume and concentration and, in turn, pollinator visitation rates (Wheeler, 2025), and temperature can shift pollinator floral choice independently of which species are present (Arrowsmith et al., 2025).

A parallel frontier asks whether plants can evolve fast enough to keep up. Models parameterized with long-term RMBL data suggest that evolutionary rescue via a single trait (specific leaf area) is possible in some I. aggregata populations but requires the combination of strong selection, high heritability, and phenotypic plasticity, and is undercut by year-to-year variability in snowmelt (Campbell et al., 2025). A broader synthesis of herbaceous model species finds evidence of climate-driven fitness loss and maladaptation in every species examined, with limited dispersal constraining rescue (Kooyers et al., 2025). Other emerging directions include nocturnal moth pollen-transport networks (Syskine & Boggs, 2025), the chemistry of pollen defense compounds (Rivest et al., 2024), sodium as an underappreciated nectar reward (VanValkenburg et al., 2024), and calls for more reproducible methods in floral volatile research (Kantsa et al., 2022).

Open questions

Several questions stand out for the next decade. How will rewiring buffer or fail to buffer meadows as warming, earlier snowmelt, and drought reshape both plant and pollinator communities? Can evolutionary rescue operate in multiple traits at once, and how does environmental stochasticity — not just gradual change — interact with plasticity and selection to determine population persistence? What roles do understudied players such as nectar microbes, nocturnal moths, and pollen chemistry play in shaping pollinator behavior and plant fitness? How do pre-zygotic post-pollination processes work when heterospecific pollen transfer is common even between distantly related species (Cohen et al., 2025)? And methodologically, how can floral volatile studies adopt reproducible standards so that cross-site comparisons become possible? Answering these questions will require continued long-term monitoring at sites like RMBL coupled with mechanistic experiments and stronger links between ecological and evolutionary models.

References

Arrowsmith, J., et al. (2025). Temperature influences pollinators' choice of floral partners independently of community composition. Journal of Animal Ecology.

Bergman, E., et al. (2021). Open-top warming chambers reduce animal pollination of two subalpine herbs.

Brookes, R. H., et al. (2016). Drought, pollen and nectar availability, and pollination success.

Brosi, B. J., & Briggs, H. M. (2013). Single pollinator species losses reduce floral fidelity and plant reproductive function. PNAS.

Campbell, D. R., & Halama, K. J. (1993). Resource and pollen limitations to lifetime seed production in a natural plant population. Ecology.

Campbell, D. R., & Powers, J. M. (2019). Early snowmelt projected to cause population decline in a subalpine plant.

Campbell, D. R., et al. (2018). Clines in traits compared over two decades in a plant hybrid zone.

Campbell, D. R., et al. (2021). Plant-pollinator interaction niche broadens in response to severe drought perturbations.

Campbell, D. R., et al. (2022). Genetic and spatial variation in vegetative and floral traits across a hybrid zone.

Campbell, D. R., et al. (2025). Predicting the contribution of single trait evolution to rescuing a plant population from demographic impacts of climate change. Evolution Letters.

CaraDonna, P. J., et al. (2017). Interaction rewiring and the rapid turnover of plant-pollinator networks. Ecology Letters.

Cohen, J. I., et al. (2025). Phylogeny does not predict the outcome of heterospecific pollen-pistil interactions in a species-rich alpine plant community. American Journal of Botany.

Cuartas-Hernández, S., et al. (2020). Temporal flexibility in the structure of plant-pollinator interaction networks.

Harder, L. D., & Thomson, J. D. (1989). Evolutionary options for maximizing pollen dispersal of animal-pollinated plants. American Naturalist.

Inouye, D. W. (1978). Resource partitioning in bumblebees: experimental studies of foraging behavior. Ecology.

Inouye, D. W. (1980). The terminology of floral larceny. Ecology.

Kantsa, A., et al. (2022). An analytical pipeline to support robust research on the ecology, evolution, and function of floral volatiles.

Kooyers, N. J., et al. (2025). Responses to climate change – insights and limitations from herbaceous plant model species. New Phytologist.

Maloof, J. E., & Inouye, D. W. (2000). Are nectar robbers cheaters or mutualists? Ecology.

Ogilvie, J. E., & Forrest, J. R. K. (2022). Removing flowers of a generalist plant changes pollinator visitation, composition, and interaction network structure.

Ogilvie, J. E., et al. (2022). Simultaneous niche expansion and contraction in plant-pollinator networks under drought.

Ollerton, J., et al. (2009). A global test of the pollination syndrome hypothesis. Annals of Botany.

Powers, J. M., et al. (2025). Natural selection on floral volatiles and other traits can change with snowmelt timing and summer precipitation. New Phytologist.

Price, M. V., & Waser, N. M. (1979). Pollen dispersal and optimal outcrossing in Delphinium nelsoni. Nature.

Pyke, G. H. (1978). Optimal foraging: movement patterns of bumblebees between inflorescences. Theoretical Population Biology.

Rivest, S., et al. (2024). Consequences of pollen defense compounds for pollinators and antagonists in a pollen rewarding plant. Ecology.

Syskine, I., & Boggs, C. L. (2025). Flying by night: Comparing nocturnal pollinator networks over time in the Colorado Rocky Mountains. Ecological Entomology.

Thomson, J. D., & Thomson, B. A. (1991). Heterogeneity among floral visitors leads to discordance between removal and deposition of pollen.

VanValkenburg, A., et al. (2024). Sodium enriched nectar shapes plant-pollinator interactions in a subalpine meadow. Ecology and Evolution.

Waser, N. M. (1978). Competition for hummingbird pollination and sequential flowering in two Colorado wildflowers. Ecology.

Waser, N. M., Chittka, L., Price, M. V., Williams, N. M., & Ollerton, J. (1996). Generalization in pollination systems, and why it matters. Ecology.

Wheeler, K. (2025). Temperature and relative humidity effects on nectar quantity, nectar quality, and plant-pollinator interactions.

Wu, S., et al. (2025). Effects of experimental warming on floral scent, display and rewards in two subalpine herbs. Annals of Botany.

Concept (14) →

optimal outcrossing distance

Distance range that maximizes pollen fertilization success and offspring survival

processpopulation ecology9 papers

fixation indices

F-statistics (FIS, FST, FIT) measuring genetic differentiation and inbreeding at different hierarchical levels

metricpopulation ecology9 papers

multidimensional phenospace

The extent of possible variation in a particular phenotypic trait where different dimensions represent the extent of phenotypic variation in two trait...

frameworkevolution8 papers

hybrid breakdown

Reduced fitness in F2 hybrids compared to F1 hybrids, often attributed to genetic incompatibilities between nuclear genes

phenomenonevolution7 papers

total fitness

Population growth rate (λ) integrating all vital rate components equivalent to average fitness component across a lineage or population

measurementpopulation ecology5 papers

reciprocal hybridization

Crosses between two species where each species serves as both maternal and paternal parent, allowing study of cytoplasmic inheritance effects

processevolution5 papers

pathogen transmission

Spread of disease between individuals through various mechanisms including spore dispersal

processpopulation ecology4 papers

scent emission

measurementgeneral ecology2 papers

reproducible research

Research practices that allow independent researchers to reproduce results using the same methods and data

frameworkmethodological2 papers

cognitive ecology

Study of how cognitive mechanisms govern decision-making by floral visitors and shape pollination and plant fitness

frameworkgeneral ecology2 papers
Show 4 more concepts

Protocol (10) →

Starch gel electrophoresis (Polemoniaceae)

Standard enzyme electrophoresis technique used to determine genotypes at the 6PGD-2 locus for parentage assignment. Distinguishes between homozygous m...

laboratorystandardized20 papers

Null model permutation testing

Generation of null models that maintain interaction totals per species while randomizing interaction patterns, followed by permutation tests to assess...

analyticalstandardized10 papers

Transect-based seed sampling for plant population genetics (Ranunculaceae)

Systematic collection of seeds from plants along established transects for genetic analysis. Seeds collected within defined distances of sampling poin...

samplingstandardized8 papers

Microsatellite genotyping (Polemoniaceae)

PCR amplification of microsatellite loci followed by capillary electrophoresis for allele sizing and polymorphism assessment.

analyticalstandardized7 papers

Evolutionary rescue modeling with environmental stochasticity

Development of deterministic and stochastic population models incorporating empirical estimates of selection, heritability, and phenotypic plasticity ...

computational5 papers

Hybrid zone cline analysis over elevational gradient (Polemoniaceae)

Long-term monitoring of plant morphological traits across permanent transects spanning a hybrid zone between two Ipomopsis species along an elevationa...

samplingstandardized4 papers

reflectance-based chlorophyll index (Polemoniaceae)

Non-destructive estimation of leaf chlorophyll concentration using reflectance spectroscopy and vegetation indices.

measurement4 papers

Ordinal rust infection severity assessment

Weekly assessment of fungal rust infection using a 6-class ordinal scale from absent (0) to 75-100% infected (5), with infection location recorded.

observational3 papers

Split-plot experimental design

Replicated split-plot design with snowmelt manipulated at plot level and precipitation manipulated at subplot level.

experimental2 papers

negative binomial regression

Statistical analysis using zero-inflated negative binomial generalized linear mixed models to account for excess zeros in ecological count data, speci...

analytical2 papers

Author (85) →

Show 75 more authors

Marian A. Zimmerman

21 works

George Aldridge

9 works

B. A. Roy

17 works

A. Jurgens

3 works

J. Pleasants

11 works

C. N. Morozumi

4 works

Jocelyn Navarro

3 works

Justin Kipness

Rocky Mountain Biological Laboratory3 works

R. J. Mitchell

14 works

Ayaka Paul

3 works

Kaysee Arrowsmith

3 works

A. Schiffer

2 works

J. Brunet

9 works

X. Loy

7 works

R. G. Shaw

6 works

R. Alarcon

5 works

Madison Crowell

Rocky Mountain Biological Laboratory3 works

D. Lopez

3 works

J. Ollerton

3 works

D. Hopp

2 works

L. Chittka

6 works

A. Faidiga

2 works

Paula Sosenski

Autonomous University of Yucatán3 works

P. G. Wolf

4 works

J. E. L. Maloof

5 works

Candace Galen

University of Missouri4 works

Peter G.L. Klinkhamer

4 works

E. J. Melendez-Ackerman

4 works

C. J. Nelson

Rocky Mountain Biological Laboratory3 works

D. A. Stratton

3 works

A. M. Delva

2 works

M. Forster

2 works

Ross M. Brennan

University of California, Davis4 works

C. Wendlandt

2 works

V. A. Reynolds

2 works

G. Trujillo

2 works

R. B. Miller

7 works

James L. Cunningham

University of Arizona3 works

P. E. Howell

University of Georgia3 works

L. Harder

University of Calgary3 works

C. M. Hodges

5 works

M. Bosch

2 works

G. Clarke

4 works

T. J. Barnes

2 works

P. Bierzychudek

10 works

Ethan VanValkenburg

University of Michigan-Ann ArborORCID: 0009-0001-3610-65903 works

A. M. Montalvo

5 works

L. M. Graceffa

2 works

E. I. Hersch-Green

2 works

Saskia G.T. Klumpers

2 works

Trevor Ledbetter

2 works

S. Lei

2 works

Kyle Niezgoda

Emory University2 works

Theodora Petanidou

University of the Aegean2 works

C. Rasmussen

2 works

L. S. Rayor

2 works

Wilnelia Recart

2 works

Kevin Ryan

US Geological SurveyORCID: 0000-0003-1202-36162 works

S. Travers

6 works

J. Schmitt

2 works

H. R. Pulliam

1 work

Maya Midzik

Rocky Mountain Biological Laboratory3 works

James V. Jones

4 works

M. A. Schlessman

3 works

M. Stang

3 works

J. Agren

2 works

W. A. Barr

2 works

Geoffrey Broadhead

Cornell University2 works

D. A. Cibula

2 works

Asstan Cisse

2 works

T. J. De Jong

2 works

E. K. Dobbs

2 works

S. E. Elliott

2 works

Heather Ellison

2 works

N. C. Ellstrand

2 works

Publication (372) →

Show 362 more publications

Bottom-up effects of nutrient enrichment on plants, pollinators, and their interactions

2008thesis

Floral reward strategies, visitor behavior, and plant reproductive outcomes

2019thesis

Effects of experimental warming on floral scent, display and rewards in two subalpine herbs

2025Annals of Botanyarticle

Comparative impacts of long-term trends in snowmelt and species interactions on plant population dynamics

2022Journal of Ecologyarticle

Interaction rewiring and the rapid turnover of plant-pollinator networks

2017Ecology Lettersarticle

Responses to climate change – insights and limitations from herbaceous plant model species

2025New Phytologistarticle

Linking pollinator visitation rate and pollen receipt

2003American Journal of Botanyarticle

Altered precipitation affects plant hybrids differently than their parental species

2013American Journal of Botanyarticle

Conditional Exploitation and Context-Dependent Fitness Consequences of Pollination Mutualisms

2018http://hdl.handle.net/10150/628436thesis

Measurements of selection in a hermaphroditic plant: variation in male and female pollination success

1989Evolutionarticle

Variation in nectar robbing over time, space, and species

2002Oecologiaarticle

Phenotypic plasticity of floral volatiles in response to increasing drought stress

2019American Journal of Botanyarticle

Nectar Robbing in <i>Ipomopsis aggregata</i>: Effects on Pollinator Behavior and Plant Fitness

1998Oecologiaarticle

Genetic and spatial variation in vegetative and floral traits across a hybrid zone

2022American Journal of Botanyarticle

Temporal scale-dependence of plant–pollinator networks

2020Oikosarticle

The structure of plant-pollinator interactions in montane meadow environments

2004thesis

Reciprocal benefits in a plant-pollinator mutualism

2008thesis

Competitive context drives pollinator behavior: linking foraging plasticity, natural pollen deposition, and plant reproduction.

2016thesis

Nectar robbing in Ipomopsis aggregata: does high nectar production confer tolerance?

2005student paper

The terminology of floral larceny

1980Ecologyarticle

Components of Phenotypic Selection: pollen export and flower corolla width in Ipomopsis aggregata

1991Evolutionarticle

The impact of floral larceny on individuals, populations, and communities

2001Oecologiaarticle

Plant–pollinator interaction niche broadens in response to severe drought perturbations

2021Oecologiaarticle

Phenotypic plasticity and selection on leaf traits in response to snowmelt timing and summer precipitation

2022New Phytologistarticle

The dual role of floral traits: pollinator attraction and plant defense

2004Ecologyarticle

Predicting the effects of nectar robbing on plant reproduction: implications of pollen limitation and plant mating system

2007American Journal of Botanyarticle

Resource partitioning in bumblebees: experimental studies of foraging behavior

1978Ecologyarticle

Single pollinator species losses reduce floral fidelity and plant reproductive function

2013PNASarticle

Facilitated exploitation of pollination mutualisms: fitness consequences for plants

2017Journal of Ecologyarticle

Perturbations in plant-pollinator networks: Integrating theoretical and empirical approaches to understand responses to global change

2022thesis

Predicting the contribution of single trait evolution to rescuing a plant population from demographic impacts of climate change

2025Evolution Lettersarticle

Pollinator and habitat-mediated selection as potential contributors to ecological speciation in two closely related species

2023Evolution Lettersarticle

Lifetime fitness in two generations of <i>Ipomopsis</i> hybrids

2008Evolutionarticle

Context-dependent reproductive isolation mediated by floral scent and color

2015Evolutionarticle

Bridging the generation gap in plants: pollination, parental fecundity, and offspring demography

2008Ecologyarticle

Ecophysiology of first and second generation hybrids in a natural plant hybrid zone

2005Oecologiaarticle

Realized tolerance to nectar robbing: compensation to floral enemies in <i>Ipomopsis aggregata</i>

2009Annals of Botanyarticle

Roles of pollinators, seed predators, and vertebrate herbivores in maintaining females in the gynodioecious <i>Polemonium foliosissimum</i>.

2014thesis

Direct and indirect effects of pollinators and seed predators to selection on plant and floral traits

2004Oikosarticle

Clines in traits compared over two decades in a plant hybrid zone

2018Annals of Botanyarticle

Temporal flexibility in the structure of plant–pollinator interaction networks

2020Oikosarticle

The evolutionary ecology of ultraviolet floral pigmentation

2015thesis

Beyond biomass: measuring the effects of community-level nitrogen enrichment on floral traits, pollinator visitation and plant reproduction

2010J of Ecologyarticle

Effects of high temperature and early snowmelt on floral morphology and volatile organic compounds in <i> Ipomopsis aggregata </i>

2021student paper

Natural selection on floral volatiles and other traits can change with snowmelt timing and summer precipitation

2025New Phytologistarticle

Effects of Local Density on Pollination and Reproduction in <i>Delphinium nuttallianum</i> and <i>Aconitum columbianum</i> (Ranunculaceae)

1999American Journal of Botanyarticle

Floral scent in natural hybrids of <i>Ipomopsis</i> (Polemoniaceae) and their two parental species

2014Annals of Botanyarticle

Predicting patterns of mating and potential hybridization from pollinator behavior

2002American Naturalistarticle

Optimal foraging: movement patterns of bumblebees between inflorescences

1978Theoretical Population Biologyarticle

Photosynthetic and growth responses of reciprocal hybrids to variation in water and nitrogen availability

2010American Journal of Botanyarticle

Nectar production patterns in Ipomopsis aggregata (Polemoniaceae)

1983American Journal of Botanyarticle

Evolution of floral traits in a hermaphroditic plant: field measurements of heritabilities and genetic correlations

1996Evolutionarticle

Effects of floral traits on sequential components of fitness in Ipomopsis aggregata

1991American Naturalistarticle

Consequences of nectar robbing for realized male function in a hummingbird-pollinated plant

2000Ecologyarticle

Is Plant Fitness Proportional to Seed Set? An Experiment and a Spatial Model

2017The American Naturalistarticle

Ecology and evolution of plant-pollinator interactions

2009Annals of Botanyarticle

Effects of road dust on the pollination and reproduction of wildflowers

2017International Journal of Plant Sciencesarticle

Genetic and environmental variation in life-history traits of a monocarpic perennial: a decade-long field experiment

1997Evolutionarticle

Removing flowers of a generalist plant changes pollinator visitation, composition, and interaction network structure

2022Ecospherearticle

Nectar addition changes pollinator behavior but not plant reproduction in pollen rewarding <i> Lupinus argenteus</i>

2021American Journal of Botanyarticle

Predispersal Seed Predation Obscures the Detrimental Effect of Dust on Wildflower Reproduction

2021International Journal of Plant Sciencesarticle

Interpopulation variation and optimal mating in the perennial herb, Polemonium brandegeei

2024thesis

Why are some plant-nectar robber interactions commensalisms?

2018Oikosarticle

Invasive plants and water availablity mediate outcomes of plant-pollinator interactions

2019thesis

Competition for nectar resources does not affect bee foraging tactic constancy

2020Ecological Entomologyarticle

Additive effects of herbivory, nectar robbing and seed predation on male and female fitness components of the host plant <i>Ipomopsis aggregata</i>

2011Oecologiaarticle

The hole truth: why do bumble bees rob flowers more than once?

2024Plantsarticle

Are nectar robbers cheaters or mutualists?

2000Ecologyarticle

Stimulation of flower nectar replenishment by removal: a survey of eleven animal-pollinated plant species

2014Journal of Pollination Ecologyarticle

Interactions between nectar robbers and seed predators mediated by a shared host plant, <i>Ipomopsis aggregata</i>

2008Oecologiaarticle

Mechanisms of tolerance to floral larceny in two animal-pollinated wildflowers, <i>Polemonium viscosum</i> and <i>Ipomopsis aggregata</i>

2008Ecologyarticle

Impact of nectar robbing on estimates of pollen flow: conceptual predictions and emperical outcomes

2003Ecologyarticle

Adaptive speciation

2004chapter

Heterospecific pollen deposition in <i>Delphinium barbeyi</i>: linking stigmatic pollen loads to reproductive output in the field

2016Annals of Botanyarticle

Pollinator shifts and the origin and loss of plant species

2008Annals of the Missouri Botanical Gardenarticle

Effects of nectar robbing on nectar dynamics and bumblebee foraging strategies in Linaria vulgaris

2005Oikosarticle

Bumble bees are constant to nectar-robbing behaviour despite low switching costs

2020Animal Behaviourarticle

Foraging strategy predicts foraging economy in a facultative secondary nectar robber

2017Oikosarticle

The sensory and cognitive ecology of nectar robbing

2021Frontiers in Ecology and Evolutionarticle

Quantifying direct vs. indirect effects of nectar robbers on male and female components of plant fitness

2015Journal of Ecologyarticle

Norditerpene alkaloid concentrations in tissues and floral rewards of larkspurs and impacts on pollinators

2013Biochemical Systematics and Ecologyarticle

Bumblebee response to variation in nectar availability

1981Ecologyarticle

Genetic and morphological patterns show variation in frequency of hybrids between <i>Ipomopsis</i> (Polemoneaceae) zones of sympatry

2009Heredityarticle

Adaptive significance of flower color and inter-trait correlations in an <i>Ipomopsis</i> hybrid zone

1998Evolutionarticle

Effects of flowering plant density on pollinator visitation, pollen receipt, and seed production in <i>Delphinium barbeyi</i>

2009American Journal of Botanyarticle

Floral phenotypic response of <i> Ipomopsis aggregata </i> and related hybrids to changing soil moisture and nitrogen enrichment

2022student paper

Pollinator choice and stabilizing selection for flower color in Delphinium nelsonii

1981Evolutionarticle

Pollen precedence and stigma closure: a mechanism of competition for pollination between Delphinium nelsonii and Ipomopsis aggregata

1986Oecologiaarticle

The behavioral ecology of nectar robbing: why be tactic constant?

2017Current Opinion in Insect Sciencearticle

Optimal outcrossing in Ipomopsis aggregata: seed set and offspring fitness

1989Evolutionarticle

Reproductive isolation and hybrid pollen disadvantage in <i>Ipomopsis</i>

2003Journal of Evolutionary Biologyarticle

Environmental stressors differentially affect leaf ecophysiological responses in two <i>Ipomopsis</i> species and their hybrids

2006Oecologiaarticle

Birds Perceive More Intraspecific Color Variation in Bird-Pollinated Than Bee-Pollinated Flowers

2020Frontiers in Plant Science. doi 10.3389/fpls.2020.590347article

Pollination, breeding system, and genetic structure in two sympatric <i>Delphinium</i> (Ranunculaceae) species

2001American Journal of Botanyarticle

Investigating the impact of pollinator- and seed predator-mediated selection on floral traits in an <i>Ipomopsis aggregata</i> and <i>I. tenuituba</i> (Polemoniaceae) hybrid zone

2012student paper

Pollen transfer by hummingbirds and bumblebees, and divergence of pollination modes in <i>Penstemon</i>

2003Evolutionarticle

Effective mutualism between sequentially flowering plant species

1979Naturearticle

Density-dependent demographic responses of a semelparous plant to natural variation in seed rain

2010Oikosarticle

Simultaneous niche expansion and contraction in plant–pollinator networks under drought

2022Oikosarticle

A comparison of distances flown by different visitors to flowers of the same species

1982Oecologiaarticle

Leaf physiology reflects environmental differences and cytoplasmic background in <i>Ipomopsis</i> hybrids

2007American Journal of Botanyarticle

Inflorescence size: test of the male function hypothesis

1989American Journal of Botanyarticle

Comparing clines in floral and vegetative traits along an elevation gradient in an <i>Ipomopsis</i> hybrid zone

2016student paper

Reproductive costs of self-pollination in Ipomopsis aggregata: are ovules usurped?

1991American Journal of Botanyarticle

Pollen presentation and pollination syndromes, with special reference to <i>Penstemon</i>

2000Plant Species Biologyarticle

Self-sterility in <i>Ipomopsis aggregata</i> (Polemoniaceae) is due to prezygotic ovule degeneration

2006American Journal of Botanyarticle

Pollinator specialization: from the individual to the community

2016New Phytologistarticle

When resources don't rescue: flowering phenology and species interactions affect compensation to herbivory in <i>Ipomopsis aggregata</i>

2012Oikosarticle

A global test of the pollination syndrome hypothesis

2009Annals of Botanyarticle

Life-history consequences of vegetative damage in scarlet gilia, a monocarpic plant

2007Oikosarticle

Phylogeny does not predict the outcome of heterospecific pollen–pistil interactions in a species-rich alpine plant community

2025American Journal of Botanyarticle

Pollen dispersal and optimal outcrossing in Delphinium nelsoni

1979Naturearticle

Pollen transport and deposition by bumble bees in Erythronium: influences of floral nectar and bee grooming

1986Journal of Ecologyarticle

Size-specific interaction patterns and size matching in a plant-pollinator interaction web

2009Annals of Botanyarticle

Yeasts in nectar enhance male fitness in a montane perennial herb

2014Ecologyarticle

Experimental species removals impact the architecture of pollination networks

2017Biology Lettersarticle

Temperature influences pollinators' choice of floral partners independently of community composition

2025Journal of Animal Ecologyarticle

Effect of Road Dust Deposition on the Floral Lifespan of Scarlet gilia, <i>Ipomopsis aggregata</i>

2017student paper

Effects of nectar robbing on pollen deposition and hummingbird-pollinator behavior in <i>Ipomopsis aggregata</i>

2009student paper

Plasticity and changes in selection in response to changing precipitation regimes

2013student paper

Unraveling the ecological and evolutionary impacts of a plant invader on the pollination of a native plant

2021Biological Invasions doi 10.1007/s10530-021-02457-zarticle

Selection of trait combinations through bee and fly visitation to flowers of <i>Polemonium foliosissimum</i>

2014Journal of Evolutionary Biologyarticle

Nectar Yeasts in the Tall Larkspur <i>Delphinium barbeyi</i> (Ranunculaceae) and Effects on Components of Pollinator Foraging Behavior

2014PloS onearticle

Oviposition patterns and larval success of a pre-dispersal seed predator attacking two confamilial host plants

1995Oikosarticle

Community context mediates effects of pollinator loss on seed production

2023Ecospherearticle

Open-top warming chambers reduce animal pollination of two subalpine herbs

2021Journal of Pollination Ecologyarticle

The effects of a bumble bee nectar robber on plant reproductive success and pollinator behavior

2001American Journal of Botanyarticle

Genetic and environmental variation in leaf traits and physiology of <i>Ipomopsis</i>

2012student paper

Effects of pollinators, herbivores, and seed predators on flowering phenology

1997Ecologyarticle

The effects of snowmelt date, soil moisture, and precipitation on nectar and floral morphology of Ipomopsis

2025student paper

Genotype-by-environment interaction and the fitness of plant hybrids in the wild

2001Evolutionarticle

Pollinator traits and competitive context shape dynamic foraging behavior in bee communities

2017bioRxivother

'Anti-bee' and 'pro-bird' changes during the evolution of hummingbird pollination in Penstemon flowers

2004Journal of Evolutionary Biologyarticle

Hummingbird avoidance of nectar-robbed plants: spatial location or visual cues

2000Oikosarticle

Trade-off mitigation: a conceptual framework for understanding floral adaptation in multispecies interactions

2021Biological Reviewsarticle

The effects of road dust on pollination and reproduction of the native wildflower species, <i>Delphinium nuttallianum</i>

2013student paper

Butterflies show flower colour preferences but not constancy in foraging at four plant species

2011Ecological Entomologyarticle

Plasticity in Ipomopsis flower color and nectar production over space and time in response to water availability

2023student paper

Foraging efficiency and size matching in a plant-pollinator communitiy: the importance of sugar content and tongue length

2019Ecology lettersarticle

Volatile organic compounds as signals for pollinators and their consistency across years

2019student paper

Asymmetrical pollen success in Ipomopsis (Polemoniaceae) contact sites

2006American Journal of Botanyarticle

A trade-off between the frequency and duration of bumblebee visits to flowers

1998Oecologiaarticle

Elevational and temporal variation in Ipomopsis floral and vegetative traits.

2015student paper

Demographic responses of hybridizing cinquefoils to changing climate in the Colorado Rocky Mountains

2023Ecology and Evolutionarticle

Dose-dependent effects of nectar alkaloids in a montane plant-pollinator community

2013Journal of Ecologyarticle

Food supply and nest timing of broad-tailed hummingbirds in the Rocky Mountains

1976Condorarticle

Biotic and abiotic drivers of pathogen prevalence in a rust fungus with multiple plant hosts

2025student paper

Indirect selection of stigma position in Ipomopsis aggregata via a genetically correlated trait

1994Evolutionarticle

Water-use efficiency may influence the distribution of <i>Ipomopsis aggregata</i>, <i>I. tenuituba</i>, and their natural hybrids along an environmental gradient

2009student paper

Heterogeneity among floral visitors leads to discordance between removal and deposition of pollen

1991Ecologyarticle

An analytical pipeline to support robust research on the ecology, evolution, and function of floral volatiles

2022Frontiers in Ecology and Evolutionarticle

Quantifying Nectar Resources in Bumble Bee Visited Plants

2019student paper

Variability in the effectiveness of <i>Penstemon strictus</i> pollinators and the role that water availability plays

2017student paper

How does road dust influence Ipomopsis pollination?

2018student paper

Sweet and salty: Pollinators and sodium-enriched nectar

2022student paper

Experimental studies of pollen carryover: hummingbirds and Ipomopsis aggregata

1982Oecologiaarticle

Pollen and gene dispersal: the influences of competition for pollination

1985Evolutionarticle

Investigating the potential mechanism behind bumble bee preference for Corydalis flowers inhabited by nectar specialist yeast

2024student paper

Comparing pollen dispersal and gene flow in a natural plant population

1991Evolutionarticle

The Impact of Primary and Secondary Robbing on Hummingbird Pollination.

2014student paper

Seed set and seed mass in <i>Ipomopsis aggregata</i>: variance partitioning and inferences about postpollination selection

1995Evolutionarticle

Elucidating the influence of a nectar yeast and nectar robbing on bumblebee foraging tactic constancy

2024student paper

Effects of Interspecific Pollen Transfer (IPT) in a Specialist and a Generalist Flower

2005student paper

Using the literature to test pollination syndromes - some methodological cautions

2015Journal of Pollination Ecologyarticle

Costs and benefits of alternative food handling tactics help explain facultative exploitation of pollination mutualisms

2018Ecological Society of Americaarticle

Road Dust, <i>Ipomopsis aggregata</i> Seed Count, and attack by <i>Hylemya</i> Flies—Are they Linked?

2016student paper

Spatial genetic heterogeneity in a population of the montane perennial plant Delphinium nelsonii

1987Heredityarticle

Variation in bill morphology and pollen prevalence in the Broad-Tailed Hummingbird (<i>Selasphorus platycercus</i>)

2017student paper

Is there a positive correlation between bee size and size parameters of the flowers the bees visit for pollen to provision their nests?

2009student paper

Pollinator behaviour and natural selection for flower colour in Delphinium nelsonii

1983Naturearticle

Flying by night: Comparing nocturnal pollinator networks over time in the Colorado Rocky Mountains

2025Ecological Entomologyarticle

Fit or Unlit: using quantum dots to investigate the effects of a floricolous yeast and nectar robbing on male fitness in Ipomopsis aggregata

2024student paper

The spatial variation of leaf traits in <i> Ipomopsis </i> according to soil moisture and snow depth

2021student paper

Atypical flowers can be as profitable as typical hummingbird flowers

2018The American Naturalistarticle

The Effect of Dominant Floral Resource Removal on Plant-Pollinator Interactions

2017student paper

Effects of water availability on expression of vegetative traits in Ipomopsis across space and time

2024student paper

Resistance to pre-dispersal seed predators in a natural hybrid zone

2002Oecologiaarticle

Pollinator-mediated selection on a flower color polymorphism in experimental populations of <i>Antirrhinum</i> (Scrophulariaceae)

2001American Journal of Botanyarticle

Using phenotypic manipulations to study multivariate selection of floral trait associations

2009Annals of Botanyarticle

Snowmelt Timing Leads to Plasticity and Alters Natural Selection on Leaf Traits in <i> Ipomopsis </i>

2022student paper

Reproductive biology of a North American subalpine plant: <i>Corydalis caseana</i> A. Gray ssp. <i>brandegei</i> (S. Watson) G. B. Ownbey

2000Plant Species Biologyarticle

Pollen transfer by natural hybrids and parental species in an <i>Ipomopsis</i> hybrid zone

1998Evolutionarticle

The Effects of Early Snowmelt on Drought Stress in Subalpine Plant Species

2024student paper

Determining changes in floral volatile composition of <i> Ipomopsis aggregata </i> in response to nectar robbing and its associated microorganisms

2022student paper

Optimal foraging in hummingbirds: testing the marginal value theorem

1978American Zoologistarticle

Impacts of snowmelt timing and precipitation on the expression of vegetative traits and floral traits in <i>Ipomopsis aggregata</i>

2020student paper

The Effects of Exclusion Bags and Open-Top Chambers on Pollinator Activity

2019Student paperstudent paper

The Role of <i>Castilleja spp.</i> In Plant and Mycorrhizae Communities Within Various Climates

2017student paper

Evolutionary options for maximizing pollen dispersal of animal-pollinated plants.

1989American Naturalistarticle

Trapline foraging by pollinators: its ontogeny, economics and possible consequences for plants

2009Annals of Botanyarticle

Effects of Experimental Water Addition on Floral Nectar Traits

2022student paper

A study of correlational selection through floral manipulations of <i></i>Polemonium foliosissimum<i></i> (Polemoniaceae)

2010student paper

The effects of ungulate herbivory and nutrient variation on pollen reciept in Ipomopsis aggregata

2002student paper

The Impact of Delphinium nuttallianum and Ipomopsis aggregata Phenology on Broad tailed Hummingbird (Selasphorus platycercus) Visitation Patterns

2024student paper

The spatial scale of genetic differentiation in a hummingbird-pollinated plant: comparison with models of isolation by distance

1992American Naturalistarticle

Determining pollinator behavior differences bumblebees and flies.

2023student paper

The effects of floral fragrance manipulations of <i>Ipomopsis aggregata</i> on the seed predator <i>Hylemya</i>

2011student paper

The Impact of Delphinium nuttallianum and Ipomopsis aggregata Phenology on Broad-tailed Hummingbird (Selasphorus platycercus) Visitation Patterns

2024student paper

Pollinators of the Rocky Mountain columbine: temporal variation, functional groups and associations with floral traits

2009Annals of Botanyarticle

Evolvability and trait function predict phenotypic divergence of plant populations

2023Proceedings of the National Academy of Sciencesarticle

Bumblebee foraging on vertical inflorescences: optimal or not?

2009student paper

Bill Morphology and Niche Partitioning in <i>Selasphorus platycercus</i>

2016student paper

Flower constancy, insect psychology, and plant evolution

1999Naturwissenschaftenarticle

Variation in pollinator preference between two <i>Ipomopsis</i> contact sites that differ in hybridization rate

2007Evolutionarticle

Optimal foraging in bumblebees and coevolution with their plants

1978Oecologiaarticle

Fungal Phytopathogens Decrease Plant-Insect Interactions.

2015student paper

Pollinator selection by floral traits and color in a hybrid zone of <i>Ipomopsis aggregata</i> and <i>I. tenuituba</i> (Polemoniaceae)

2004student paper

Effect of Nitrogen on Linaria vulgaris and Native Species

2024student paper

The impacts of early snowmelt and summer precipitation on the physiology and leaf morphology of <i>Ipomopsis aggregata</i>

2018student paper

Consequences of Pollination Neighborhood Composition and Pollinator Communities

2014student paper

Quantifying the effects of pollen load and heterospecific pollen ratio on the species <i>Delphinium barbeyi</i> (Ranunculaceae)

2013student paper

Volatile production by the buds and corollas of two sympatric, confamial plants, Ipomopsis aggregata and Polemonium foliosissimum

2002Journal of Chemical Ecologyarticle

Nectar robbing patterns in Ipomopsis aggregata and Linaria vulgaris

2006student paper

Evolutionary dynamics of an <i>Ipomopsis</i> hybrid zone: confronting models with lifetime fitness data

2007American Naturalistarticle

Plant reproduction and optimal foraging: experimental nectar manipulations in Delphinium nelsonii

1983Oikosarticle

Consequences of Nectar Robbing in Colorado Wildflowers: Insect Variation and Nectar Sugar Concentration

2017student paper

Patchiness in the dispersion of nectar resources: evidence for hot and cold spots

1979Oecologiaarticle

Efficient harvesting of renewing resources

2005Behavioral Ecologyarticle

Effects of Floral Abundance, Pollinator Interactions, and Floral Morphology on Stigmatic Pollen Deposition

2022student paper

Environmental Correlates and Fitness Consequences of a Flower Color Polymorphism in Boechera stricta.

2015student paper

Testing the oviposition cues that drive preference of <i></i>Hylemya<i></i> for different sexes of <i></i>Polemonium foliosissimum<i></i>

2010student paper

Patterns of color and nectar variation across an <i>Ipomopsis</i> (Polemoniaceae) hybrid zone

1997American Journal of Botanyarticle

Optimal nectar production in a hummingbird pollinated plant

1981Theoretical Population Biologyarticle

Temporal variation in high elevation plant-pollinator communities

2022student paper

Why red flowers are not invisible to bees

1997Israel Journal of Plant Sciencesarticle

The effect of Delphinium nelsonii pollen on seed set in Ipomopsis aggregata, a competitor for hummingbird pollination

1985American Journal of Botanyarticle

Differential success of pollen donors in a self-compatible lily

1993Evolutionarticle

Effects of floral traits, pollinator visitation, and plant size on Ipomopsis aggregata fruit production

1994American Naturalistarticle

Mutualistic Networks Over Time: The Effects of Changing Floral Abundances on Plant- Pollinator Interactions

2016student paper

Geographical variation in hybridization of <i>Ipomopsis</i> (Polemoniaceae): testing the role of photosynthetic responses to temperature and water

2013International Journal of Plant Sciencesarticle

Observing pollinator trait variation in relation to niche breadth in seasons of high and low precipitation

2019student paper

Does road dust affect growth rates in <i>Ipomopsis aggregata</i>?

2019student paper

Dynamic nectar replenishment in flowers of <i>Penstemon</i> (Scrophulariaceae)

2002American Journal of Botanyarticle

Niche partitioning due to adaptive foraging reverses effects of nestedness and connectance on pollination network stability

2016Ecology Lettersarticle

What are the bees' needs? Analyzing the diet breadth for three Rocky Mountain Bumble Bees

2020student paper

Investigating the Effect of Drought on Floral Traits Mediating Pollinator Interactions

2023student paper

In your stomach or in your nectar? Disentangling the effects of two pollination-related yeasts on bumblebee behavior and foraging

2023student paper

Untangling the seasonal dynamics of plant-pollinator communities

2020Nature Communications. DOI: 10.1038/s41467-020-17894-yarticle

Physiological and Morphological Changes in Ipomopsis aggregata Along an Elevational Gradient

2006student paper

The effect of changing floral density on pollinator networks in a subalpine meadow environment

2025student paper

The effects of water and phosphorus on floral traits and nectar production of <i>Ipomopsis aggregata</i>

2007student paper

Hybridization and pollinator behavior in <i>Castilleja</i> (Orobanchaceae)

2006student paper

The effects of the invasive plant <i>Linaria vulgaris</i> on native plant fitness and pollinator behavior

2005student paper

Ecological causes and consequences of flower color polymorphism in <i>Boechera stricta</i>

2011student paper

Does Road Dust Affect Hylemya Oviposition in Scarlet Gilia (<i>Ipomopsis aggregata</i>)?

2017student paper

Impacts of drought gradient on pollen limitation in flowers in dry subalpine meadows

2018student paper

Characterizing nectar content in wet and dry subalpine meadows during an extreme summer drought

2018student paper

The effects of primary and secondary nectar robbing of Ipomopsis aggregata on hummingbird visitation.

2015student paper

Effects of Temperature and Competitor Abundance on Bumble Bee Foraging

2024student paper

Effects of nectar robbing on the volatile organic compounds and nectar chemistry of intraindividual flowers in <i> Corydalis caseana </i> ssp. <i> brandegeei </i>

2021student paper

The effects of floral traits on the behaviors of pollinators and pre-dispersal seed predators in a gynodioecious species, <i>Polemonium foliosissimum</i>.

2012student paper

Interactions among nectar robbing, floral herbivory, and ant protection in <i>Linaria vulgaris</i>

2005Oikosarticle

Hierarchical analysis of allozymic and morphometric variation in a montane herb, Ipomopsis aggregata (Polemoniaceae)

1995Journal of Heredityarticle

Rescue of stranded pollen grains by secondary transfer

2003Plant Species Biologyarticle

The Effects of Soil Nitrogen Availability on Plant Reproduction and Solitary Bee Behavior

2006student paper

Effects of Bombus Pollinator Removal on Fly Foraging Behavior.

2015student paper

Diptera behavioral response to targeted <i>Bombus</i> removal

2011student paper

Pollinator-mediate selection in Ipomopsis aggregata: does correlational selection explain floral phenotypes?

2008student paper

Geitonogamy: the neglected side of selfing

1993Trends in Ecology and Evolutionarticle

The effect of nectar guides on pollinator preference: experimental studies with a montane herb

1985Oecologiaarticle

Reciprocal transplant experiments with Delphinium nelsonii (Ranunculaceae): evidence for local adaptation

1985American Journal of Botanyarticle

Testing the marginal value theorem on Bombus appositus and Bombus nevadensis

2025student paper

Observing the effects of a nectar-inhabiting bacterium, Pantoea sp., and nectar robbing on male fitness in Ipomopsis aggregata

2025student paper

Impact of Decreased Flower Attractiveness on Pollinator Visitation Rates and Pollinator Community Composition

2024student paper

Optimal foraging, plant density and the marginal value theorem

1981Oecologiaarticle

Experimental studies of pollen carryover: effects of floral variability in Ipomopsis aggregata

1984Oecologiaarticle

Consequences of pollen defense compounds for pollinators and antagonists in a pollen rewarding plant

2024Ecologyarticle

Consequences of secondary nectar robbing for male components of plant reproduction

2018American Journal of Botanyarticle

Does Floral Nectar Depth Correlate With Pollinator Proboscis Length?

2024student paper

Pollinator foraging behavior and gene dispersal in Senecio (Compositae)

1980Evolutionarticle

Biotic and abiotic drivers of plant-pollinator interaction rewiring

2023thesis

Tests of pre- and postpollination barriers to hybridization between sympatric species of <i>Ipomopsis</i> (Polemoniaceae)

2001American Journal of Botanyarticle

Relative success of self and outcross pollen comparing mixed- and single-donor pollinations in <i>Aquilegia caerulea</i>

1992Evolutionarticle

Color polymorphism in <i>Boechera stricta</i> due to phenotypic plasticity and reproductive advantage

2010student paper

Sodium enriched nectar shapes plant–pollinator interactions in a subalpine meadow

2024Ecology and Evolutionarticle

Optimal foraging in hummingbirds: rule of movement between inflorescences

1981Animal Behaviourarticle

Temperature and relative humidity effects on nectar quantity, nectar quality, and plant-pollinator interactions

2025student paper

Quantifying within-season floral trait distributions of flowers in Colorado Rocky Mountain sub-alpine dry meadows.

2015student paper

Optimal foraging in bumblebees: rule of movement between flowers within inflorescences

1979Animal Behaviourarticle

Plant-Pollinator Interactions between Erigeron speciosus and Heterotheca villosa in Virginia Basin

2024student paper

Attracting pollinators and avoiding herbivores: insects influence plant traits within and across years

2013Oecologiaarticle

Testing evolutionary and ecological hypotheses using path analysis and structural equation modelling

1992Functional Ecologyarticle

Effects of water availability on the relationship between seed set and pollen received in Ipomopsis aggregate.

2014student paper

The distribution of standing crop of nectar: what does it really tell us?

1983Oecologiaarticle

Improving our chemistry: Challenges and opportunities in the interdisciplinary study of floral volatiles

2015Natural Products Reportsarticle

Trapline foraging by bumblebees: I. Persistence of flight-path geometry

1996Behavioral Ecologyarticle

Pollination, angiosperm speciation, and the nature of species boundaries

1998Oikosarticle

Context-dependent pollinator behavior: An explanation for patterns of hybridization among three species of Indian paintbrush

2007Evolutionarticle

Variation in sex allocation and floral morphology in Ipomopsis aggregata (Polemoniaceae)

1992American Journal of Botanyarticle

Mysteries of road dust: Does road dust influence flower lifespan in scarlet gilia?

2016student paper

The pollination ecology of Aquilegia elegantula and A. caerulea (Ranunculaceae) in Colorado

1978American Journal of Botanyarticle

DOES LINARIA VULGARIS, AN INVASIVE, INTERFERE WITH THE POLLINATION OF THE NATIVE SPECIES, POTENTILLA PULCHERRIMA?

2004student paper

Patchiness in the dispersion of nectar resources: probable causes

1981Oecologiaarticle

Quantitative genetics of sequential life-history and juvenile traits in the partially selfing perennial, <i>Aquilegia caerulea</i>

1994Evolutionarticle

Bumblebee foraging at a "hummingbird" flower: reward economics and floral choice

1985American Midland Naturalistarticle

Pollinator flight directionality and the assessment of pollen returns

1981Oecologiaarticle

Variation in pollen flow within and among populations of Ipomopsis aggregata

1989Evolutionarticle

Systematic increase in pollen carryover and its consequences for geitonogamy in plant populations

1994Oikosarticle

Impact of insect pollinator group and floral display size on outcrossing rate

2006Evolutionarticle

Foraging in bumblebees: rule of departure from an inflorescence

1982Canadian Journal of Zoologyarticle

Optimal foraging: a case for random movement

1979Oecologiaarticle

Comment on Cognition-mediated evolution of low-quality floral nectars.

2017Scienceother

Does road dust have an effect on nectar production in <i> pomopsis aggregata </i>?

2019student paper

Optimal foraging in bumblebees: hunting by expectation

1981Animal Behaviourarticle

Microsatellite loci in <i>Ipomopsis aggregata</i> (Polemoniaceae) and cross-species applicability for ecological genetics studies

2012American Journal of Botanyarticle

Olfactory versus visual cues in a floral mimicry system

1997Oecologiaarticle

Hybridization between the invasives <i>Tragopogon pratensis</i> and <i>T. dubius</i> in the Gunnison Valley

2011student paper

The effect of nectar production on neighborhood size

1982Oecologiaarticle

Talking Yeast: The characterization of bumblebee- and nectar- specialist yeast volatiles in Corydalis caseana

2023student paper

Pollination Syndrome variance among foraging bumblebee species in Gothic Colorado

2024student paper

Floral mimicry by a plant pathogen

1993Naturearticle

Floral sex allocation in sequentially blooming plants

1995Evolutionarticle

Bumblebee foraging responses to variation in floral scent and color in snapdragons (Antirrhinum: Scrophulariaceae)

1999American Midland Naturalistarticle

The evolution of plant mating systems: multilocus simulations of pollen dispersal

1987American Naturalistarticle

Optimal foraging in bumblebees: calculation of net rate of energy intake and optimal patch choice

1980Theoretical Population Biologyarticle

Sources of variation in plant reproductive success, and implications for concepts of sexual selection

1989American Naturalistarticle

Flowering plant density and pollinator visitation in Senecio

1983Oecologiaarticle

Optimal foraging: random movement by pollen collecting bumblebees

1982Oecologiaarticle

40 years of progress in pollination biology, and what it means for citizen scientists

2017Aquilegia: Newsletter of the Colorado Native Plant Societyother

Tangled trios?: Characterizing a hybrid zone in <i>Castilleja</i> (Orobanchaceae)

2009American Journal of Botanyarticle

Functions of staminate flowers in andromonoecious <i>Pseudocymopterus montanus</i> (Apiaceae, Apioideae)

2004Plant species biologyarticle

Polyploidy in Indian paintbrush (<i>Castilleja</i>; Orobanchaccae) species shapes but does not prevent gene flow across species boundaries

2012American Journal of Botanyarticle

Spatial and temporal components of resource assessment by flower-feeding insects

1981Journal of Animal Ecologyarticle

Interspecific pollen transfer and competition between co-occurring plant species

1978Oecologiaarticle

Dispersal of Erythronium grandiflorum pollen by bumblebees: implications for gene flow and reproductive success

1989Evolutionarticle

Floral morphology and cross-pollination in Erythronium grandiflorum (Liliaceae)

1985American Journal of Botanyarticle

Evolutionary options for maximizing pollen dispersal of animal-pollinated plants

1989American Naturalistarticle

Multiple paternity in fruits of <i>Ipomopsis aggregata</i> (Polemoniaceae)

1998American Journal of Botanyarticle

Germination schedules of pollen grains: implications for pollen selection

1989Evolutionarticle

Experimental manipulation of plant density and its effect on pollination and reproduction of two confamilial montane herbs

2001Oecologiaarticle

The effect of plant density on departure decisions: testing the marginal value theorem using bumblebees and Delphinium nelsonii

1984Oikosarticle

Crossing distance effects on prezygotic performance in plants: an argument for female choice

1993Oikosarticle

Pollen-pollen and pollen-style interactions during pollen tube growth in Erythronium grandiflorum (Liliaceae)

1990American Journal of Botanyarticle

Optimal foraging in bumblebees: why is nectar left behind in flowers?

1981Behavioral Ecologyarticle

Hypotheses for the evolution of dioecy in seed plants

1990Trends in Ecology and Evolutionarticle

Patch dynamics of a foraging assemblage of bees

1985Oecologiaarticle

Gender inequality in predispersal seed predation contributes to female seed set advantage in a gynodioecious species

2015Ecologyarticle

Patterns of rust infection as a function of host genetic diversity and host density in natural populations of the apomictic crucifer, <i>Arabis holboellii</i>

1993Evolutionarticle

Pollen tube attrition in Erythronium grandiflorum

1989American Journal of Botanyarticle

Bedazzled by flowers

1998Naturearticle

The breeding systems of six species of <i>Arabis</i> (Brassicaceae)

1995American Journal of Botanyarticle

What plant ecologists can learn from zoology

1998Perspectives in Plant Ecology, Evolution and Systematicsarticle

Competition for pollination and the evolution of flowering time

1977thesis

Sex allocation in hermaphroditic plants

1992Trends in Ecology and Evolutionarticle

Calculating nectar production rates: residual nectar and optimal foraging

1983Oecologiaarticle

Nectar standing crops in Delphinium nelsonii flowers: spatial autocorrelation among plants?

1990Ecologyarticle

Floral formula inconstancy within and among plants and populations of Ipomopsis aggregata (Polemoniaceae)

1983Botanical Gazettearticle

The use and abuse of pollinators by fungi

1994Trends in Ecology and Evolutionarticle

Hawkmoths and the geographic patterns of floral variation in Aquilegia caerulea

1981Evolutionarticle

Pollen discounting in Erythronium grandiflorum: mass-action estimates from pollen transfer dynamics

1994American Naturalistarticle

Trapline foraging by bumble bees: II. Definition and detection from sequence data

1997Behavioral Ecologyarticle

Tactics for male reproductive success in plants: contrasting insights of sex allocation theory and pollen presentation theory

2006Integrative and Comparative Biologyarticle

Spatial and temporal patterns of floral inconstancy in plants and populations of Ipomopsis aggregata (Polemoniaceae)

1988Botanical Gazettearticle

Why hummingbirds hover and honeyeaters perch

1981Animal Behaviorarticle

Hibernation in the Gunnison's prairie dog

1987Journal of Mammalogyarticle

Resource value affects territorial defense by Broad-tailed and Rufous hummingbirds

2006Journal of Field Ornithologyarticle

Patterns in plant parthenogenesis

1985Experientiaarticle

Variation in pollen size, fertilization ability and postfertilization siring ability in Erythronium grandiflorum

1990Evolutionarticle

Zen Ecology and the origin of scientific ideas

2017American Society of Naturalistsother

Competition among pollinators: quantification of available resources

1982Oikosarticle

Cryptic species in the Puccinia monoica complex

1998Mycologiaarticle

A plant pathogen influences pollinator behavior and may influence reproduction of nonhosts

1996Ecologyarticle

Dataset (24) →

Data from: Genetic and spatial variation in vegetative and floral traits across a hybrid zone

Premise: Genetic variation influences potential for evolution to rescue populations from impacts of environmental change. Most studies of genetic vari...

other2022

Data from: Comparative impacts of long-term trends in snowmelt and species interactions on plant population dynamics

Climate change can impact plant fitness and population persistence directly through changing abiotic conditions and indirectly through its effects on ...

other2022

Data from: Is plant fitness proportional to seed set? An experiment and a spatial model

Individual differences in fecundity often serve as proxies for differences in overall fitness, especially when it is difficult to track the fate of an...

other2017

Leaf gas exchange in Ipomopsis aggregata under manipulated snowmelt timing and summer precipitation

Vegetative traits of plants can respond directly to changes in the environment, such as those occurring under climate change. That phenotypic plastici...

other2022

Data from: Interaction rewiring and the rapid turnover of plant-pollinator networks

Whether species interactions are static or change over time has wide-reaching ecological and evolutionary consequences. However, species interaction n...

other2018

Data for: Predicting the contribution of single trait evolution to rescuing a plant population from demographic impacts of climate change

Evolutionary adaptation can allow a population to persist in the face of a new environmental challenge. With many populations now threatened by enviro...

other2025

Data from: Selection of floral traits by pollinators and seed predators during sequential life history stages

Organismal traits often influence fitness via interactions with multiple species. That selection is not necessarily predictable from pairwise interact...

other2021

Data from: Quantifying direct vs. indirect effects of nectar robbers on male and female components of plant fitness

1. Plants interact simultaneously with both mutualists and antagonists. While webs of plant-animal interactions in natural systems can be highly compl...

other2016

Data from: Phylogeny does not predict the outcome of heterospecific pollen-pistil interactions in a species-rich alpine plant community

Premise: Co-occurring plant species that share generalist pollinators often exchange pollen. This heterospecific pollen transfer (HPT) impacts male an...

other2024

Data from: Temporal scale-dependence of plant-pollinator networks

[object Object]

2021
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Data from: Foraging efficiency and size matching in a plant – pollinator community: the importance of sugar content and tongue length

A longstanding question in ecology is how species interactions are structured within communities. Although evolutionary theory predicts close size mat...

other2020

Data for: Pollinator and habitat-mediated selection as potential contributors to ecological speciation in two closely related species

In ecological speciation, incipient species diverge due to natural selection that is ecologically based. In flowering plants, different pollinators co...

other2023

Data from: Facilitated exploitation of pollination mutualisms: fitness consequences for plants

Mutualisms are only rarely one-to-one interactions: each species generally interacts with multiple mutualists. Exploitation is ubiquitous in mutualism...

other2017

Data from: Unraveling the ecological and evolutionary impacts of a plant invader on the pollination of a native plant

Interactions between a native plant species and its pollinators, herbivores, or microbiome can be affected by the presence of non-native plant speci...

other2023

Data from: Atypical flowers can be as profitable as typical hummingbird flowers

In western North America, hummingbirds can be observed systematically visiting flowers that lack the typical reddish color, tubular morphology, and di...

other2018

Data from: Experimental species removals impact the architecture of pollination networks

Mutualistic networks are key for the creation and maintenance of biodiversity, yet are threatened by global environmental change. Most simulation mode...

other2017

Data from: Context-dependent reproductive isolation mediated by floral scent and color

Reproductive isolation due to pollinator behavior is considered a key mode of speciation in flowering plants. Although floral scent is thought to medi...

other2014

Why are some plant—nectar robber interactions commensalisms?

Many plants that bear hidden or recessed floral nectar experience nectar robbing, the removal of nectar by a floral visitor through holes pierced in t...

other2021

Impacts of beekeeping on wild bee diversity and pollination networks in the Aegean Archipelago

Maintaining the diversity of wild bees is a priority for preserving ecosystem function and promoting stability and productivity of agroecosystems. How...

other2021

Data from: Foraging strategy predicts foraging economy in a facultative secondary nectar robber

In mutualistic interactions, the decision whether to cooperate or cheat depends on the relative costs and benefits of each strategy. In pollination mu...

other2017

Heiling.et.al.Oikos.2018.data

An Excel workbook of data for Heiling et al 2018. First sheet is a metadata file, all other sheets are arrange chronologically. Sheet names describe t...

other2018

Temperature influences pollinator' choice of floral partners independently of community composition

[object Object]

2025

Data supplementing Lichtenberg et al. (2020) Competition for nectar resources does not affect bee foraging tactic constancy. Ecological Entomology

This dataset contains data and scripts that supplement the publication Lichtenberg et al. (2020) Competition for nectar resources does not affect bee ...

other2020

Data from: Coordinated species importation policies are needed to reduce serious invasions globally: the case of alien bumblebees in South America

The global trade of species promotes diverse human activities but also facilitates the introduction of potentially invasive species into new environme...

other2019