期刊
AMERICAN NATURALIST
卷 175, 期 2, 页码 174-185出版社
UNIV CHICAGO PRESS
DOI: 10.1086/649596
关键词
polyandry; sperm competition; seminal fluid; tragedy of the commons; coevolutionary dynamics; sexual selection
资金
- Royal Society of London
- Natural Environment Research Council
- National Science Foundation
- Jesus College Oxford
- Yale University
- Natural Environment Research Council [NE/D003865/1, NE/C507196/1, NE/D002788/1, NE/H008047/1] Funding Source: researchfish
- NERC [NE/H008047/1, NE/D002788/1, NE/D003865/1] Funding Source: UKRI
- Direct For Biological Sciences
- Emerging Frontiers [0827504] Funding Source: National Science Foundation
Female promiscuity forces the ejaculates of different males to compete for fertilization through sperm competition. In turn, competing ejaculates often influence female promiscuity and fitness, for example, when ejaculate products increase female fecundity. Here we develop theory examining situations where males stimulate female fecundity and compete for fertilization and female remating is influenced by male fecundity stimulation. We consider the fitness consequences that fecundity stimulation has simultaneously for males inseminating the same female and for the female herself, and we show that the way fecundity increases with male stimulation shifts the coevolutionary dynamics of female remating and male ejaculate expenditure from conflict to cooperation among all mating partners. When fecundity stimulation is weak and males know their mating roles, the second male to inseminate a female can exploit the fecundity stimulation of the first male, fostering intra-and intersexual conflict over female remating. However, in a diversity of species where fecundity more than doubles with remating, we show that the female and both males can gain from female remating, leading to intra-and intersexual cooperation over female remating. This coevolutionary perspective yields new insights into the connection between promiscuity, fecundity, and sperm competition and the complex interplay between sexual conflict and cooperation.
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