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60 results for “pollinator selection”
Relaxation of purifying selection suggests low effective population size in eusocial Hymenoptera and solitary pollinating bees
<p>Data and results of the paper "Relaxation of purifying selection suggests low effective population size in eusocial Hymenoptera and solitary pollinating bees".</p> <p>- data_table_species.csv: contains life-history and geographical range descriptors, terminal branch length and genomic estimated values for each substitution category, for each species in the dataset. Contains results obtained with both the complete data set and the subsampled dataset with 88 species.</p> <p>- data_table_genes.csv: contains values of substitution count that are sums of the values obtained for every species in the alignment. Also contains the results of HyPhy RELAX analyses for each alignment.</p> <p>- data_table_genes_species.csv: contains estimated values for each substitution category for each species in each alignment. Contains results obtained with both the complete data set and the subsampled dataset with 88 species.</p> <p> </p>
Data for: Pollinator and habitat-mediated selection as potential contributors to ecological speciation in two closely related species
<p>In ecological speciation, incipient species diverge due to natural selection that is ecologically based. In flowering plants, different pollinators could mediate that selection (pollinator-mediated divergent selection) or other features of the environment that differ between habitats of two species could do so (environment-mediated divergent selection). Although these mechanisms are well understood, they have received little rigorous testing, as few studies of divergent selection across sites of closely related species include both floral traits that influence pollination and vegetative traits that influence survival. This study employed common gardens in sites of the two parental species and a hybrid site, each containing advanced generation hybrids along with the parental species, to test these forms of ecological speciation in plants of the genus <em>Ipomopsis</em>. Three vegetative traits (specific leaf area, leaf trichomes, and photosynthetic water-use efficiency) and five floral traits (corolla length and width, anther insertion, petal color, nectar production) were analyzed for impacts on fitness components (survival to flowering and seeds per flower, respectively). These traits exhibited strong clines across the elevational gradient in the hybrid zone, with narrower clines in theory reflecting stronger selection or higher genetic variance. Plants with long corollas and inserted anthers had higher seeds per flower at the <em>I. tenuituba </em>site, whereas selection favored the reverse condition at the <em>I. aggregata</em> site, a signature of divergent selection. In contrast, no divergent selection due to variation in survival was detected on any vegetative trait. Selection within the hybrid zone most closely resembled selection within the <em>I. aggregata</em> site. Across traits, the strength of divergent selection was not significantly correlated with width of the cline, which was better predicted by evolvability (standardized genetic variance). These results support the role of pollinator-mediated divergent selection in ecological speciation and illustrate the importance of genetic variance in determining divergence across hybrid zones.</p>
The effect of experimental pollinator decline on pollinator-mediated selection on floral traits
<p>Human-mediated environmental change, by reducing mean fitness, is hypothesized to strengthen selection on traits that mediate interactions among species. For example, human-mediated declines in pollinator populations are hypothesized to reduce mean seed production by increasing the magnitude of pollen limitation and thus strengthen pollinator-mediated selection on floral traits that increase pollinator attraction or pollen transfer efficiency. To test this hypothesis, we measured two female fitness components and six floral traits of <em>Lobelia siphilitica</em> plants exposed to supplemental hand-pollination, ambient open-pollination, or reduced open-pollination treatments. The reduced treatment simulated pollinator decline, while the supplemental treatment was used to estimate pollen limitation and pollinator-mediated selection. We found that plants in the reduced pollination treatment were significantly pollen-limited, resulting in pollinator-mediated selection for taller inflorescences and more vibrant petals, both traits that could increase pollinator attraction. This contrasts with plants in the ambient pollination treatment, where reproduction was not pollen-limited and there was no significant pollinator-mediated selection on any floral trait. Our results support the hypothesis that human-mediated environmental change can strengthen the selection on traits of interacting species and suggest that these traits have the potential to evolve in response to changing environments.</p>
Data from Investigating the effects of diurnal and nocturnal pollinators on male and female reproductive success and on floral trait selection in Silene dioica
<p><strong>data_all_OdEx.csv</strong>: all data about phenotypes or reproductive success at the individual scale</p> <ul> <li>ID : ID name</li> <li>nGrSemis_min : seed number needed to be sowned to get enough seedlings</li> <li>nGrGerm : seed number effectively sowned</li> <li>nGrGerm_OK : number of germinated seed</li> <li>TauxGerm : germination rate</li> <li>nFruits_MAX : maximal number of fruit that the plant could have produced</li> <li>nFruits_OK : effective number of fruits that the plant had produced</li> <li>nFruits_OK_avecPred : effective number of fruits that the plant had produced ignoring predation</li> <li>nFruits_pred : number of predated fruits</li> <li>mean_nbSeeds : mean number of seeds per fruit</li> <li>sd_nbSeeds : sd number of seeds per fruit</li> <li>mean_nbOv : mean ovule non fertilize per fruit</li> <li>sd_nbOv : sd ovule non fertilize per fruit</li> <li>mean_nbOvTOT : mean ovule number per flower</li> <li>sd_nbOvTOT : sd ovule number per flower</li> <li>prodTOT : total number of seed produced including germination rate</li> <li>FS : Fruit-set</li> <li>SS : Seed-set</li> <li>prodTOTsg : total number of seed produced without germination rate</li> <li>nbFlo_run0 : flower number at the beginning of the experiment</li> <li>nbFlo_run1 : flower number at the first measurement</li> <li>mean_nbFlo : mean flower number</li> <li>MeanFec : mean seed sired per males according to MEMM model</li> <li>MeanDelta : mean delta pollen dispersion according to MEMM model</li> <li>MeanMRS : mean male reproductive success (including female RS) according to MEMM model</li> <li>MedFec : same as above with the median</li> <li>MedDelta : same as above with the median</li> <li>MedMRS : same as above with the median</li> <li>VarFec : same as above with the variance</li> <li>VarDelta : same as above with the variance</li> <li>VarMRS : same as above with the variance</li> <li>ciFec : Same as above with confidence interval</li> <li>ciDelta : Same as above with confidence interval</li> <li>ciMRS : Same as above with confidence interval</li> <li>MS_Res : mating success</li> <li>mean_lFl : mean corolla width</li> <li>mean_hFl : mean calyx height</li> <li>QttTOT : pollen number per flower</li> <li>pop : which originate population</li> <li>cohort : which cohort</li> </ul> <p><strong>data_seeds_OdEx.csv</strong> : all data about seed number of weight as well as unfertilized ovule at the fruit scale for female RS</p> <ul> <li>ID : ID name</li> <li>noFruit : ID fruit</li> <li>poids : seed weight</li> <li>nbSeeds : number of seeds</li> <li>nbOv : number of unfertilized ovule</li> <li>moySeeds : mean seed size</li> <li>varSeeds : variance in seed size</li> </ul> <p><strong>data_poll_OdEx.csv</strong> : all data about pollinator observation session</p> <ul> <li>ID : ID name</li> <li>session : observation session number</li> <li>nbVis : number of independent insect attracted</li> <li>nbVisTot : number of total visit</li> <li>binVis : individual visited or not</li> </ul>
Simulated pollinator decline has similar effects on seed production of female and hermaphrodite Lobelia siphilitica, but different effects on selection on floral traits
<p><span>PREMISE:</span><span> Pollinator decline, by reducing seed production, is predicted to strengthen natural selection on floral traits. However, the effect of pollinator decline on gender dimorphic species (such as gynodioecious species, where plants produce female or hermaphrodite flowers) may differ between the sex morphs: if pollinator decline reduces the seed production of females more than hermaphrodites, then it should also have a larger effect on selection on floral traits in females than in hermaphrodites.</span></p> <p><span>RESULTS: </span><span>Experimentally reducing pollination decreased seed production of both females and hermaphrodites by ~21%. Reducing pollination also strengthened selection on floral traits, but this effect was not larger in females than in hermaphrodites. Instead, reducing pollination intensified selection for taller inflorescences in hermaphrodites, but did not intensify selection on any floral trait in females.</span></p> <p><span>CONCLUSIONS:</span><span> Our results suggest that pollinator decline will not have a larger effect on either seed production or selection on floral traits of female plants. As such, any effect of pollinator decline on seed production may be similar for gender dimorphic and monomorphic species. However, the potential for floral traits of females (and thus of gender dimorphic species) to evolve in response to pollinator decline could be limited.</span></p>
Lack of pollinators selects for increased selfing, restricted gene flow and resource allocation in the rare Mediterranean sage Salvia brachyodon
<p>Salvia brachyodon (Lamiaceae): raw data on flower morphometry, nectar concentration and volume and seed weight according various pollination treatments.</p>
Data for: Pollinator and habitat-mediated selection as potential contributors to ecological speciation in two closely related species
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The effect of experimental pollinator decline on pollinator-mediated selection on floral traits
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Simulated pollinator decline has similar effects on seed production of female and hermaphrodite Lobelia siphilitica, but different effects on selection on floral traits
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Data from: Linking divergence in phenotypic selection on floral traits to divergence in local pollinator assemblages in a pollination-generalized plant
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Floral signals evolve in a predictable way under artificial and pollinator selection in Brassica rapa
<p>You find here the R scripts and data necessary to reproduce the results published in "Floral signals evolve in a predictable way under artificial and pollinator selection in Brassica rapa" by Zu et al. 2020 BMC Evolutionary Biology.</p> <p>The whole analysis is in the script "G-analysis.R". The associated data is loaded from the ".Rdata" and ".txt" files associated. The scripts "randG...R" are required to generate bootstrap replicates of G-matrix estimates. This is best done on an HPC cluster. To avoid having to run those randomizations, we provide the summary data we have generated from randomizations to run the full analysis.</p> <p>In Zu et al., we used data from an artificial selection and a pollinator (bumblebee, hoverfly) evolution experiment with fast cycling <em>Brassica rapa </em>plants to predict evolutionary changes of 12 floral volatiles and 4 morphological floral traits in response to selection. Using the observed selection gradients and the genetic variance-covariance matrix (G-matrix) of the traits, we showed that the observed responses of most floral traits including volatiles were predicted in the right direction in both artificial- and bumblebee-selection experiment. Genetic covariance had a mix of constraining and facilitating effects on evolutionary responses. We further revealed that G-matrices also evolved in the selection processes.</p> <p>We are depositing here the raw phenotypic data used to estimate the G-matrices in the artificial selection experiment along with the R scripts used to run the analyses.</p> <p>The phenotypic data of the pollinator experimental evolution experiment have been published elsewehere (Gervasi & Schiestl, 2017, Nature Communications 8:14691; doi:10.1038/ncomms14691).</p>
Data from: Herbivores and plant defenses affect selection on plant reproductive traits more strongly than pollinators
Pollinators and herbivores can both affect the evolutionary diversification of plant reproductive traits. However, plant defenses frequently alter antagonistic and mutualistic interactions and therefore variation in plant defenses may alter patterns of herbivore- and pollinator-mediated selection on plant traits. We tested this hypothesis by conducting a common garden field experiment using 50 clonal genotypes of white clover (Trifolium repens) that varied in a Mendelian inherited chemical antiherbivore defense—the production of hydrogen cyanide (HCN). To evaluate whether plant defenses alter herbivore- and/or pollinator-mediated selection, we factorially crossed chemical defense (25 cyanogenic and 25 acyanogenic genotypes), herbivore damage (herbivore suppression) and pollination (hand-pollination). We found that herbivores weakened selection for increased inflorescence production, suggesting that large displays are costly in the presence of herbivores. In addition, herbivores weakened selection on flower size but only among acyanogenic plants, suggesting that plant defenses reduce the strength of herbivore-mediated selection. Pollinators did not independently affect selection on any trait, although pollinators weakened selection for later flowering among cyanogenic plants. Overall, cyanogenic plant defenses consistently increased the strength of positive directional selection on reproductive traits. Herbivores and pollinators both strengthened and weakened the strength of selection on reproductive traits, although herbivores imposed ~2.7× stronger selection than pollinators across all traits. Contrary to the view that pollinators are the most important agents of selection on reproductive traits, our data show that selection on reproductive traits is driven primarily by variation in herbivory and plant defenses in this system.
Data from: Floral antagonists counteract pollinator-mediated selection on attractiveness traits in the hummingbird-pollinated Collaea cipoensis (Fabaceae)
Pollinator-mediated selection towards larger and abundant flowers is common in naturally pollen-limited populations. However, floral antagonists may counteract this effect, maintaining smaller- and few-flowered individuals within populations. We quantified pollinator and antagonist visit rates and determined a multiplicative female fitness component from attacked and non-attacked flowers of the Brazilian hummingbird-pollinated shrub Collaea cipoensis to determine the selective effects of pollinators and floral antagonists on flower size and number. We predicted that floral antagonists reduce the female fitness component and thus exert negative selective pressures on flower size and number, counteracting the positive effects of pollinators. Pollinators, mainly hummingbirds, comprised 4% of total floral visitation, whereas antagonist ants and bees accounted for 90% of visitation. Nectar-robbers involved about 99% of floral antagonist visit rates, whereas florivores comprised the remaining 1%. Larger and abundant flowers increased both pollinator and antagonist visit rates and the female fitness component significantly decreased in flowers attacked by nectar-robbers and florivores in comparison to non-attacked flowers. We detected that pollinators favored larger- and many-flowered individuals, whereas floral antagonists exerted negative selection on flower size and number. This study confirms that floral antagonists reduce female plant fitness and this pattern directly exerts negative selective pressures on flower size and number, counteracting pollinator-mediated selection on floral attractiveness traits.
Data from: A hurricane alters pollinator relationships and natural selection on an introduced island plant
Novel relationships between the floral morphology of introduced plants and the trophic morphology of native pollinators have been hypothesized to cause strong natural selection on both parties, but evidence for such selection is rare. We capitalized on a natural disturbance to examine selection on an introduced plant, Heliconia wagneriana, on the island of Dominica, before and after Hurricane Maria. Prior to the hurricane, female Anthracothorax jugularis hummingbirds, which have longer bills than males, were the main visitor to H. wagneriana, and directional selection on corolla length was insignificant. After the hurricane, shorter-billed male A. jugularis were the main visitor to H. wagneriana. The absence of trait-matching between a short-billed pollinator and a long-flowered plant resulted in directional selection for shorter flowers because males preferentially visited plants with shorter flowers. The amount of nectar removed by male A. jugularis was negatively associated with flower length, with flowers > 53 mm containing nearly five times the nectar than flowers < 53 mm. We estimate a roughly 75% decrease in the population size of A. jugularis, and results suggest the heaviest mortality occurred among short-billed male hummingbirds and larger-bodied individuals of both sexes, which would have higher nectar requirements and the most difficulty obtaining nectar. Our results indicate that hurricanes may alter relationships between plants and pollinators, and that lack of trait-matching resulting from such disturbances may lead to selection on both plant and pollinator.
Data from: Can conflicting selection from pollinators and nectar-robbing antagonists drive adaptive pollen limitation? A conceptual model and empirical test
<p><span><span><span><span><span><span><span><span><span><span><span>Pollen limitation is widespread, despite predictions that it shouldn't be. We propose a novel mechanism generating pollen limitation: conflicting selection by pollinators and antagonists on pollinator attraction traits. We introduce a heuristic model demonstrating antagonist-induced adaptive pollen limitation, and present a field study illustrating its occurrence in a wild population. </span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span>For antagonist-induced adaptive pollen limitation to occur, four criteria must be met: 1) correlated attraction of pollinators and antagonists, 2) greater response by antagonists than pollinators to altered investment in attraction traits, 3) reduced investment in pollinator attraction leading to pollen limitation, and 4) higher fitness for plants with reduced investment in pollinator attraction.</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span>We surveyed nectar robbery and reproductive output for 109 <i>Odontonema cuspidatum </i>(Acanthaceae) plants in a pollen-limited population<i> </i>over two years and used experimental floral arrays to evaluate how flower number affects pollination and nectar robbery. Both pollinators and nectar robbers preferred larger floral displays, and nectar robbery reduced reproductive output, suggesting conflicting selection. Survey and experimental data agreed closely on the optimum flower number under antagonist-induced pollen limitation; this number was substantially overrepresented in the population. While criteria for antagonist-induced adaptive pollen limitation are restrictive, the necessary conditions may often be realized. Considering interactions beyond the plant-pollinator dyad illuminates previously overlooked mechanisms generating pollen limitation. </span></span></span></span></span></span></span></span></span></span></span></p>
Data from: On the function of flower number: disentangling fertility from pollinator-mediated selection
<p>FLODIS is an experimental research project which aims at understanding how artificially increased flower number (i.e. enhanced floral display) impacts male and female reproductive/mating success as well as sex-specific pattern of selection on floral traits, in the dioecious insect-pollinated species <em>Silene dioica</em>.</p>
Data from: Sex-specific selection patterns in a dioecious insect-pollinated plant
<p>This is an experimental research project which aims at understanding how natural and sexual selection gradients (and differentials) vary according to sex in a dioecious insect-pollinated species, <em>Silene dioica.</em> Moreover, Bateman gradients are estimated using two sampling methods for genotyped offspring acquisition. The following dataset was obtained on the whole flowering season and includes:</p> <ul> <li>individual information (population cohort etc.)</li> <li>18 floral traits (using mean for repeated measures)</li> <li>female reproductive success</li> <li>male reproductive success (clean results from CERVUS, with and without paternity share)</li> <li>male and female mating success (estimating with different sampling methods)</li> </ul>
Data from: On the function of flower number: disentangling fertility from pollinator-mediated selection
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Data from: Industry needs matter – incorporating stakeholder interests in the selection of flower resources to support pollinators
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Data from: A hurricane alters pollinator relationships and natural selection on an introduced island plant
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