A male-biased sex ratio increases the opportunity for precopulatory sexual selection but does not change the Bateman gradient

Evolution Letters, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 17, 2025

Abstract Theory predicts that the sex ratio within populations should influence strength of sexual selection, and is often used as a proxy for selection. However, recent studies challenge this relationship. We manipulated adult ratios in Drosophila melanogaster to comprehensively investigate relationship between Consistent with theory, we found stronger selection males than females an increased variance male reproductive success (the opportunity selection) male-biased ratios. In addition, faced more intense sperm competition ratios, although structure networks was largely invariant ratio. Despite this, show did not measured by Bateman gradient. leverage randomized null models reconcile these results higher may be explained random chance mating, rather competitive mechanisms. Our findings indicate caution warranted over long-standing assumption bias good

Language: Английский

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Population density affects sexual selection in an insect model

Functional Ecology, Journal Year: 2023, Volume and Issue: 37(10), P. 2734 - 2747

Published: July 31, 2023

Abstract Understanding the impact of demographic and ecological factors on strength sexual selection is pivotal to predict eco‐evolutionary dynamics in populations facing environmental change. Density expected show pervasive intra‐ interspecific variation natural populations, but its effect remains largely unexplored. We tested experimentally density standardized metrics male female red flour beetles. Specifically, we explored effects during mating by manipulating size groups arena. found that higher densities imposed a larger group amplified opportunity for pre‐copulatory females and, smaller extent, also males. Moreover, males, detected post‐copulatory groups. By contrast, differences arena resulted steeper gradient. Overall, these data suggest an important factor contributing tremendous within among species. Read free Plain Language Summary this article Journal blog.

Language: Английский

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The impact of small groups on pre‐ and postcopulatory sexual selection in polyandrous populations

Ecology and Evolution, Journal Year: 2023, Volume and Issue: 13(5)

Published: May 1, 2023

Sexual selection is a key evolutionary force but varies widely between populations. Two factors that influence sexual are the extent to which females copulate with multiple males (polyandry) and variation in social environment. Increasing research demonstrates populations structured by complex socio-sexual networks, structure of these networks can shaping relationship male precopulatory mating success intensity postcopulatory competition. However, comparatively less attention has been dedicated group on how differences size groups may impact relative pre- polyandrous The presence (i.e., structure) nature forms an implicit part much experimental under laboratory conditions. Here I use simulations competition within vary they contain, show size, particular small groups, selection. Specifically, null expectations for operation governed because smaller sizes constrain leading reinforcing episodes Given broad tendency study replicate effects have implications our understanding

Language: Английский

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Indirect genetic effects should make group size highly evolvable

Published: Sept. 1, 2023

Group size is an important trait many ecological and evolutionary processes. However, it not a possessed by individuals but social groups, as genomes contribute to group understanding its genetic underpinnings so predicting evolution conceptual challenge. Here I present suggestion for how can be modelled joint phenotype of multiple individuals, models accounting indirect effects are essential the variance size. This approach makes clear that 1) should have large always exactly much direct 2) response selection rapid correlation between at maximum positive limit 1. therefore show evolved increases decrease, consequences which evidence discuss.

Language: Английский

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Sexual size dimorphism affecting mate choice and reproduction in the pine sawyer beetle, Monochamus alternatus

Oecologia, Journal Year: 2024, Volume and Issue: 206(3-4), P. 347 - 358

Published: Nov. 10, 2024

Language: Английский

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