Diane Campbell | University of California, Irvine (original) (raw)
Papers by Diane Campbell
Global Ecology and Biogeography, 2020
AimIntraspecific trait variation (ITV) within natural plant communities can be large, influencing... more AimIntraspecific trait variation (ITV) within natural plant communities can be large, influencing local ecological processes and dynamics. Here, we shed light on how ITV in vegetative and floral traits responds to large‐scale abiotic and biotic gradients (i.e., climate and species richness). Specifically, we tested whether associations of ITV with temperature, precipitation and species richness were consistent with any of four hypotheses relating to stress tolerance and competition. Furthermore, we estimated the degree of correlation between ITV in vegetative and floral traits and how they vary along the gradients.LocationGlobal.Time period1975–2016.Major taxa studiedHerbaceous and woody plants.MethodsWe compiled a dataset of 18,401 measurements of the absolute extent of ITV (measured as the coefficient of variation) in nine vegetative and seven floral traits from 2,822 herbaceous and woody species at 2,372 locations.ResultsLarge‐scale associations between ITV and climate were trait...
Journal of pollination ecology, Apr 3, 2024
Journal of Ecology, 2022
Climate change can impact plant fitness and population persistence directly through changing abio... more Climate change can impact plant fitness and population persistence directly through changing abiotic conditions and indirectly through its effects on species interactions. Pollination and seed predation are important biotic interactions that can impact plant fitness, but their impact on population growth rates relative to the role of direct climatic effects is unknown. We combined 13 years of experiments on pollen limitation of seed set and pre‐dispersal seed predation in Ipomopsis aggregata, a subalpine wildflower, with a long‐term demographic study that has documented declining population growth with earlier spring snowmelt date. We determined how pollen limitation and seed predation changed with snowmelt date over 21 years and incorporated those effects into an integral projection model to assess relative impacts of biotic factors on population growth. Both pollen limitation and the difference in stigma pollen load between pollen‐supplemented and control plants declined over year...
Frontiers in Ecology and Evolution, Oct 20, 2022
The American Naturalist, Jun 1, 2022
American Journal of Botany, 2022
PremiseFloral scent is a key aspect of plant reproduction, but its intraspecific variation at mul... more PremiseFloral scent is a key aspect of plant reproduction, but its intraspecific variation at multiple scales is poorly understood. Sexual dimorphism and temporal regulation of scent can be shaped by evolution, and interpopulation variation may be a bridge to species differences. We tested whether intraspecific chemical diversity in a wind‐pollinated species where selection from biotic pollination is absent is associated with genetic divergence across the Hawaiian archipelago.MethodsFloral volatiles from females, males, and hermaphrodites of subdioecious Schiedea globosa grown in a common environment from 12 populations were sampled day and night and analyzed by gas chromatography–mass spectrometry. Variation among groups was analyzed by constrained ordination. We also examined the relationships of scent dissimilarity to geographic and genetic distance between populations.ResultsFlowers increased total emissions at night through higher emissions of several ketones, oximes, and pheny...
American Journal of Botany, 2022
PremiseFloral scent is a key aspect of plant reproduction, but its intraspecific variation at mul... more PremiseFloral scent is a key aspect of plant reproduction, but its intraspecific variation at multiple scales is poorly understood. Sexual dimorphism and temporal regulation of scent can be shaped by evolution, and interpopulation variation may be a bridge to species differences. We tested whether intraspecific chemical diversity in a wind‐pollinated species where selection from biotic pollination is absent is associated with genetic divergence across the Hawaiian archipelago.MethodsFloral volatiles from females, males, and hermaphrodites of subdioecious Schiedea globosa grown in a common environment from 12 populations were sampled day and night and analyzed by gas chromatography–mass spectrometry. Variation among groups was analyzed by constrained ordination. We also examined the relationships of scent dissimilarity to geographic and genetic distance between populations.ResultsFlowers increased total emissions at night through higher emissions of several ketones, oximes, and pheny...
Frontiers in Ecology and Evolution, Mar 25, 2021
Journal of Evolutionary Biology, Mar 1, 2006
New Phytologist, May 18, 2017
American Journal of Botany, Feb 21, 2020
New Phytologist, Nov 9, 2005
New Phytologist, Nov 4, 2015
▪ Quantifying the extent to which seed production is limited by the availability of pollen has ... more ▪ Quantifying the extent to which seed production is limited by the availability of pollen has been an area of intensive empirical study over the past few decades. Whereas theory predicts that pollen augmentation should not increase seed production, numerous empirical studies report significant and strong pollen limitation. Here, we use a variety of approaches to examine the correlates of pollen limitation in an effort to understand its occurrence and importance in plant evolutionary ecology. In particular, we examine the role of recent ecological perturbations in influencing pollen limitation and discuss the relation between pollen limitation and plant traits. We find that the magnitude of pollen limitation observed in natural populations depends on both historical constraints and contemporary ecological factors.
American Journal of Botany, Oct 4, 2022
Global Ecology and Biogeography, 2020
AimIntraspecific trait variation (ITV) within natural plant communities can be large, influencing... more AimIntraspecific trait variation (ITV) within natural plant communities can be large, influencing local ecological processes and dynamics. Here, we shed light on how ITV in vegetative and floral traits responds to large‐scale abiotic and biotic gradients (i.e., climate and species richness). Specifically, we tested whether associations of ITV with temperature, precipitation and species richness were consistent with any of four hypotheses relating to stress tolerance and competition. Furthermore, we estimated the degree of correlation between ITV in vegetative and floral traits and how they vary along the gradients.LocationGlobal.Time period1975–2016.Major taxa studiedHerbaceous and woody plants.MethodsWe compiled a dataset of 18,401 measurements of the absolute extent of ITV (measured as the coefficient of variation) in nine vegetative and seven floral traits from 2,822 herbaceous and woody species at 2,372 locations.ResultsLarge‐scale associations between ITV and climate were trait...
Journal of pollination ecology, Apr 3, 2024
Journal of Ecology, 2022
Climate change can impact plant fitness and population persistence directly through changing abio... more Climate change can impact plant fitness and population persistence directly through changing abiotic conditions and indirectly through its effects on species interactions. Pollination and seed predation are important biotic interactions that can impact plant fitness, but their impact on population growth rates relative to the role of direct climatic effects is unknown. We combined 13 years of experiments on pollen limitation of seed set and pre‐dispersal seed predation in Ipomopsis aggregata, a subalpine wildflower, with a long‐term demographic study that has documented declining population growth with earlier spring snowmelt date. We determined how pollen limitation and seed predation changed with snowmelt date over 21 years and incorporated those effects into an integral projection model to assess relative impacts of biotic factors on population growth. Both pollen limitation and the difference in stigma pollen load between pollen‐supplemented and control plants declined over year...
Frontiers in Ecology and Evolution, Oct 20, 2022
The American Naturalist, Jun 1, 2022
American Journal of Botany, 2022
PremiseFloral scent is a key aspect of plant reproduction, but its intraspecific variation at mul... more PremiseFloral scent is a key aspect of plant reproduction, but its intraspecific variation at multiple scales is poorly understood. Sexual dimorphism and temporal regulation of scent can be shaped by evolution, and interpopulation variation may be a bridge to species differences. We tested whether intraspecific chemical diversity in a wind‐pollinated species where selection from biotic pollination is absent is associated with genetic divergence across the Hawaiian archipelago.MethodsFloral volatiles from females, males, and hermaphrodites of subdioecious Schiedea globosa grown in a common environment from 12 populations were sampled day and night and analyzed by gas chromatography–mass spectrometry. Variation among groups was analyzed by constrained ordination. We also examined the relationships of scent dissimilarity to geographic and genetic distance between populations.ResultsFlowers increased total emissions at night through higher emissions of several ketones, oximes, and pheny...
American Journal of Botany, 2022
PremiseFloral scent is a key aspect of plant reproduction, but its intraspecific variation at mul... more PremiseFloral scent is a key aspect of plant reproduction, but its intraspecific variation at multiple scales is poorly understood. Sexual dimorphism and temporal regulation of scent can be shaped by evolution, and interpopulation variation may be a bridge to species differences. We tested whether intraspecific chemical diversity in a wind‐pollinated species where selection from biotic pollination is absent is associated with genetic divergence across the Hawaiian archipelago.MethodsFloral volatiles from females, males, and hermaphrodites of subdioecious Schiedea globosa grown in a common environment from 12 populations were sampled day and night and analyzed by gas chromatography–mass spectrometry. Variation among groups was analyzed by constrained ordination. We also examined the relationships of scent dissimilarity to geographic and genetic distance between populations.ResultsFlowers increased total emissions at night through higher emissions of several ketones, oximes, and pheny...
Frontiers in Ecology and Evolution, Mar 25, 2021
Journal of Evolutionary Biology, Mar 1, 2006
New Phytologist, May 18, 2017
American Journal of Botany, Feb 21, 2020
New Phytologist, Nov 9, 2005
New Phytologist, Nov 4, 2015
▪ Quantifying the extent to which seed production is limited by the availability of pollen has ... more ▪ Quantifying the extent to which seed production is limited by the availability of pollen has been an area of intensive empirical study over the past few decades. Whereas theory predicts that pollen augmentation should not increase seed production, numerous empirical studies report significant and strong pollen limitation. Here, we use a variety of approaches to examine the correlates of pollen limitation in an effort to understand its occurrence and importance in plant evolutionary ecology. In particular, we examine the role of recent ecological perturbations in influencing pollen limitation and discuss the relation between pollen limitation and plant traits. We find that the magnitude of pollen limitation observed in natural populations depends on both historical constraints and contemporary ecological factors.
American Journal of Botany, Oct 4, 2022