THE COMPLEX INTERPLAY OF SEX ALLOCATION AND SEXUAL SELECTION |
| |
Authors: | Isobel Booksmythe Lisa E. Schwanz Hanna Kokko |
| |
Affiliation: | 1. Centre of Excellence in Biological Interactions and Division of Ecology, Evolution & Genetics, Research School of Biology, Australian National University, Canberra 0200, Australia;2. E‐mail: isobel.booksmythe@anu.edu.au;3. Institute for Applied Ecology, University of Canberra, Canberra 2601, Australia |
| |
Abstract: | It is well recognized that sex allocation strategies can be influenced by sexual selection, when females adjust offspring sex ratios in response to their mates’ attractiveness. Yet the reciprocal influence of strategic sex allocation on processes of sexual selection has only recently been revealed. Recent theoretical work demonstrates that sex allocation weakens selection for female preferences, leading to the decline of male traits. However, these results have been derived assuming that females have perfect knowledge of mate attractiveness and precise control over cost‐free allocation. Relaxing these assumptions highlights the importance of another feedback: that adaptive sex allocation must become difficult to maintain as traits and preferences decline. When sex allocation strategies erode not only traits and preferences but also their own selective advantage, predictions can no longer be expressed as a simple linear correlation between ornament exaggeration and adaptive sex allocation. Instead, strongest sex ratio biases may be found at intermediate trait levels. |
| |
Keywords: | Coevolution eco‐evolutionary feedback female preference ornament perceptual constraint primary sex ratio |
|
|