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• W1974662868 abstract "Pollinators mediate the evolution of secondary floral traits through both natural and sexual selection. Gender-biased nectar, for example, could be maintained by one or both, depending on the interactions between plants and pollinators. Here, I investigate pollinator responses to gender-biased nectar using the dichogamous herb Chrysothemis friedrichsthaliana (Gesneriaceae) which produces more nectar during the male floral phase. Previous research showed that the hummingbird pollinator Phaethornis striigularis visited male-phase flowers more often than female-phase flowers, and multiple visits benefited male more than female fecundity. If sexual selection maintains male-biased rewards, hummingbirds should prefer more-rewarding flowers independent of floral gender. If, however, differential rewards are partially maintained through natural selection, hummingbirds should respond to asymmetry with visits that reduce geitonogamy, i.e. selfing and pollen discounting. In plants with male biases, these visit types include single-flower visits and movements from low to high rewards. To test these predictions, I manipulated nectar asymmetry between pairs of real or artificial flowers on plants and recorded foraging behaviour. I also assessed maternal costs of selfing using hand pollinations. For plants with real flowers, hummingbirds preferred more-rewarding flowers and male-phase morphology, the latter possibly owing to previous experience. At artificial arrays, hummingbirds responded to extreme reward asymmetry with increased single-flower visits; however, they moved from high to low rewards more often than low to high. Finally, selfed flowers did not produce inferior seeds. In summary, sexual selection, more so than geitonogamy avoidance, maintains nectar biases in C. friedrichsthaliana , in one of the clearest examples of sexual selection in plants, to date." @default.
• W1974662868 created "2016-06-24" @default.
• W1974662868 creator A5056197358 @default.
• W1974662868 date "2008-05-06" @default.
• W1974662868 modified "2023-09-24" @default.
• W1974662868 title "Hummingbird responses to gender-biased nectar production: are nectar biases maintained by natural or sexual selection?" @default.
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• W1974662868 doi "https://doi.org/10.1098/rspb.2008.0017" @default.
• W1974662868 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2587787" @default.
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