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16 results for “pollinator preference”
Data from: Insect pollinators show constancy for different flower traits between the most‐ and less‐preferred plants: a case study of the long‐proboscid tangle‐veined fly
<p>1. The coevolution of insect pollinators and their host plants is a typical example of natural selection; however, it remains unclear as to how insect pollinators avoid overdependence on one peculiar plant. As most insect pollinators exhibit a diet breadth when showing flower constancy, to determine the difference and similarity of most and less-preferred flowers by insect pollinators may be helpful to understand their trade-off between flower constancy and overdependence.</p> <p>2. We addressed this question in the long-proboscid tangle-veined fly (<i>Nemetrinus spp.</i>). Dietary investigation indicates that the flies show constancy for the morphological characteristic of the <i>Delphinium caeruleum</i>, which is the most preferred plant for this Nemestrinidae fly that has blue, long-tubed flowers.</p> <p>3. In a colour selection experiment, focal individuals showed obvious preference for white, which is the colour of less-preferred flowers by the fly in the natural environment. In a scent selection experiment, focal individuals showed obvious preference for <i>D. caeruleum </i>and <i>Dracocephalum heterophyllum</i>, but avoidance to <i>Dasiphora</i><i> fruticosa</i> and <i>Dasiphora davurica</i>. This indicates that long-proboscid tangle-veined flies can forage on other flowers, even the existing of constancy for <i>D. caeruleum</i>, as long as they do not hate the scent. It seems that long-proboscid tangle-veined flies can maximize foraging efficiency by showing constancy for the morphological characteristic of the most preferred plant and for the scent and colour of less-preferred plants.</p> <p>4. The tradeoff of long-proboscid tangle-veined fly in selection of nectar sources may be an adaptation to the risk of overdependence on one plant in evolution.</p>
Data from: Insect pollinators show constancy for different flower traits between the most‐ and less‐preferred plants: a case study of the long‐proboscid tangle‐veined fly
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Data from: Consequences of a nectar yeast for pollinator preference and performance
Pollinators utilize floral resources that vary in colour, scent and reward quality. Variation in such traits, including nectar rewards, in addition to cues associated with their quality, can influence pollinator foraging decisions with consequences for pollinator reproductive success. Nectar is commonly subject to colonization by micro-organisms capable of affecting a suite of traits important for pollinator attraction and fitness; yet, links between microbial presence and changes in pollinator preference and performance remain few. Here, we evaluated the effects of a nectar-inhabiting micro-organism on pollinator foraging behaviour and reproduction using the common eastern bumblebee Bombus impatiens and the cosmopolitan nectar yeast Metschnikowia reukaufii. Using a combination of choice and no-choice behavioural and feeding assays, we manipulated the presence and viability of M. reukaufii in nectar and assessed bumblebee foraging and reproductive responses. Bombus impatiens workers responded positively to the presence of yeasts. Foragers trained to associate yeast presence with flower colour visited a significantly greater proportion of flowers inoculated with yeast when subject to a colour discrimination test. Moreover, foragers naïve to nectar yeasts incorporated more yeast-inoculated flowers into initial foraging bouts when presented with a novel floral array. In addition, bees spent significantly longer foraging on yeast-inoculated flowers compared to yeast-free flowers. However, when we manipulated yeast presence and viability in microcolonies of queenless workers, we found no effect of yeast on components of bumblebee reproduction, such as initiation of egg laying and number of eggs laid. This lack of an effect of yeast persisted even under conditions of pollen limitation. Taken together, these results suggest that nectar yeasts can enhance floral signalling and alter pollinator foraging behaviour at individual flowers, though they may not directly affect pollinator performance. Thus, nectar yeasts may play a significant role in mediating pollinator foraging behaviour, with consequences for plant fitness and evolution of floral traits.
Data from: A key floral scent component (β-trans-bergamotene) drives pollinator preferences independently of pollen rewards in seep monkeyflower
1) Floral odors play an important role in attracting insect pollinators. Because pollinators visit flowers to obtain pollen and nectar rewards, they should prefer floral odor profiles associated with the highest-rewarding flowers (honest signals). In previous work, bumble bees exhibited a preference for flowers from outbred over inbred Mimulus guttatus plants. Pollen is the only floral reward in M. guttatus, and pollen viability (a reliable indicator of protein content) is reduced in inbred plants. Yet, differences in pollen viability did not explain the observed preferences. 2) In this study we examined the floral volatile profiles of inbred and outbred M. guttatus to identify inbreeding effects and associations between volatile compounds and the number of viable pollen grains per flower, designated 'PRQ' (pollen reward quality). We also conducted pairwise choice tests with Bombus impatiens to evaluate the ability of bees to discriminate between odors of rewarding and nonrewarding flowers and to determine whether bumble bee preferences are explained by differences in the floral odors of inbred and outbred plants. 3) Inbred plants exhibited reduced emission of β-trans-bergamotene, the second-most abundant compound in the volatile blend of outbred plants. Furthermore, pollen and fertile anthers emitted nonadecane. Six other compounds in the floral blend were positively correlated with PRQ. There was no overlap between compounds affected by inbreeding and compounds associated with PRQ. 4) Even when given prior experience foraging on M. guttatus, bumble bees did not distinguish between the floral odors of rewarding and non-rewarding outbred plants. However, they preferred floral odors from non-rewarding outbred plants over rewarding inbred plants. Bumble bees without prior experience of flowers preferred volatile blends with higher versus lower amounts of β-trans-bergamotene. 5) Taken together, these results suggest that the volatile emissions of M. guttatus provide reliable indicators of pollen rewards (potential honest signals), but that the preference of bumble bees for outbred plants is not driven by these cues but rather by a sensory bias for β-trans-bergamotene. This may represent a subtle form of deceit-pollination that allows plants to attract pollinators while minimizing investment in costly rewards.
Data for: A test of Sensory Drive in plant-pollinator interactions: habitat heterogeneity shapes pollinator preference for a floral visual signal
<p>DATA:</p> <p>FinnKoski_PollData_Final: Pollinator visitation data to floral arrays analyzed</p> <p>Spectra used for vismodels.zip: reflectance spectra of flowers and floral backgrounds, irradiance spectra</p> <p>ColorContrastData: visual contrast data analyzed</p> <p>CODE: </p> <p>vismod_code.R : code used for visual system modeling and calculation of contrast</p> <p>SAS_modelcode.R: SAS code used to analyze pollinator visitation data and color contrast data</p>
Data from: Quantifying hummingbird preference for floral trait combinations: the role of selection on trait interactions in the evolution of pollination syndromes
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Data from: Asymmetric effects of loss and gain of a floral trait on pollinator preference
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Data from: The influence of pollinator phylogeography and mate preference on floral divergence in a sexually deceptive daisy
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Data from: A key floral scent component (β-trans-bergamotene) drives pollinator preferences independently of pollen rewards in seep monkeyflower
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Data from: Consequences of a nectar yeast for pollinator preference and performance
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Data from: Floral community predicts pollinators' color preference: implications for Batesian floral mimicry
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Data from: Pollinator-mediated selection on floral size and tube color in Linum pubescens: can differential behavior and preference in different times of the day maintain dimorphism?
Diversity of flower traits is often proposed as the outcome of selection exerted by pollinators. Positive directional pollinator-mediated selection on floral size has been widely shown to reduce phenotypic variance. However, the underlying mechanism of maintaining within-population floral color polymorphism is poorly understood. Divergent selection, mediated by different pollinators or by both mutualists and antagonists, may create and maintain such polymorphism, but it has rarely been shown to result from differential behavior of one pollinator. We tested whether different behaviors of the same pollinators in morning and evening are associated with dimorphic floral trait in Linum pubescens, a Mediterranean annual plant that exhibits variable within-population frequencies of dark and light-colored flower tube. Usia bicolor bee-flies, the major pollinators of L. pubescens, are mostly feeding in the flower in the morning, while in the evening they are mostly visiting the flowers for mating. In two years of studying L. pubescens in a single large population in the Carmel, Israel, we found in one year that dark-centered flowers received significantly higher fraction of visits in the morning. Fitness was positively affected by number of visits, but no fitness differences were found between tube-color morphs, suggesting that both morphs have similar pollination success. Using mediation analysis, we found that flower size was under positive directional pollinator-mediated selection in both years, but pollinator behavior did not explain entirely this selection, which was possibly mediated also by other agents, such as florivores or a-biotic stresses. While most pollinator-mediated selection studies show that flower size signals food reward, in L. pubescens it may also signals for mating place, which may drive positive selection. While flower size found to be under pollinator-mediated selection in L. pubescens, but differential behavior of the pollinators in morning and evening did not seem to explain flower color polymorphism.
How much do rare and crop-pollinating bees overlap in identity and flower preferences?
1. The biodiversity-centered approach to conservation prioritizes rare species, whereas the ecosystem services approach prioritizes species that provide services to people. The two approaches align when rare species provide ecosystem services, or when both groups of species benefit from the same management action. We use data on bee pollinators and the plant species they forage on to determine if there are rare species among the most important crop pollinators, and the extent to which plant species selected to support crop pollinators would support rare species as well. 2. To assess the plant preferences of these two groups of bee species, we collected two datasets on plant-pollinator interactions, one experimental and one observational. The experiment consisted of monospecific plots of 17 plant species from which we collected bees over three years. The observational data consisted of bees collected from 66 species of plants growing in semi-natural meadows, also over three years. 3. Nineteen percent of the dominant crop pollinating species were regionally rare. Both rare species and crop-pollinating species had strong preferences for certain plants, and the preferences of rare and crop-pollinating bees were significantly but not strongly (r ≤ 0.54) correlated. Ten plant species were significantly preferred by both rare and crop-pollinating bees. 4. Synthesis and applications. We found several dominant crop pollinators that are rare at a regional scale, supporting the idea that rare species can be important providers of ecosystem services. The flower preferences of rare and crop-pollinating bees are significantly positively associated, suggesting that plants chosen to support crop pollinators will benefit rare species as well. We identify plant species that are preferred by regionally rare bees and by crop pollinators, including 10 plant species preferred by both types of bees, and recommend these for use in pollinator habitat plantings.28-Oct-2019
Data from: Pollinator-mediated selection on floral size and tube color in Linum pubescens: can differential behavior and preference in different times of the day maintain dimorphism?
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How much do rare and crop-pollinating bees overlap in identity and flower preferences?
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Honey bees and wild pollinators differ in their preference for and use of introduced floral resources
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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