期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 23, 期 3, 页码 447-462出版社
WILEY
DOI: 10.1111/j.1420-9101.2009.01921.x
关键词
mate competition; mating systems; operational sex ratio; opportunity for sexual selection; sexual selection
资金
- NSF International Research Fellowship [0701286]
- Academy of Finland
- ARC QEII Fellowship
Sexual selection can explain major micro- and macro-evolutionary patterns. Much of current theory predicts that the strength of sexual selection (i) is driven by the relative abundance of males and females prepared to mate (i.e. the operational sex ratio, OSR) and (ii) can be generally estimated by calculating intra-sexual variation in mating success (e.g. the opportunity for sexual selection, I-s). Here, we demonstrate the problematic nature of these predictions. The OSR and I-s only accurately predict sexual selection under a limited set of circumstances, and more specifically, only when mate monopolization is extremely strong. If mate monopolization is not strong, using OSR or I-s as proxies or measures of sexual selection is expected to produce spurious results that lead to the false conclusion that sexual selection is strong when it is actually weak. These findings call into question the validity of empirical conclusions based on these measures of sexual selection.
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