A model of the interaction between 'good genes' and direct benefits in courtship-feeding animals:: when do males of high genetic quality invest less?

被引:22
作者
Bussière, LF [1 ]
机构
[1] Univ Toronto, Biol Grp, Mississauga, ON L5L 1C6, Canada
关键词
courtship feeding; cryptic choice; differential allocation; direct benefits; good genes; parental investment;
D O I
10.1098/rstb.2001.0922
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Conflict between mates over the amount of parental investment by each partner is probably the rule except in rare cases of genetic monogamy. In systems with parental care, males may frequently benefit by providing smaller investments than are optimal for individual female partners. Females are therefore expected to choose males that will provide the largest amounts of parental investment. In some species, however, the preferred males provide less care than their rivals. Focusing on species in which males invest by feeding their mates, I use a simple model to demonstrate the conditions under which males preferred by females may have optimal donations that are smaller than those of less-preferred rivals. Pre-mating female choice may sufficiently bias the perception of mate availability of prefer-red males relative to their rivals such that preferred males gain by conserving resources for future matings. Similarly, 'cryptic' biases in favour of high-quality ejaculates by females can compensate for smaller than average donations received from preferred males. However, post-fertilization cryptic choice should not change the optimal donations of preferred males relative to their rivals. I discuss the implications of this work for understanding sexual selection in courtship-feeding animals, and the relevance of these systems to understanding patterns of investment for animals in general.
引用
收藏
页码:309 / 317
页数:9
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