FOOD QUALITY CONTROLS SEXUAL SELECTION IN MORMON CRICKETS BY ALTERING MALE MATING INVESTMENT
FOOD QUALITY CONTROLS SEXUAL SELECTION IN MORMON CRICKETS BY ALTERING MALE MATING INVESTMENT
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DOI：
10.2307/1940070
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发表时间：
1993-07-01
期刊：
影响因子：
4.8
通讯作者：
GWYNNE, DT
中科院分区：
文献类型：
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作者：
GWYNNE, DT
几个物种的种群在交配系统上表现出很大的差异；在一些物种中，雄性竞争而雌性选择配偶，而在另一些物种中，这些求偶角色相反。雄性袋鼠在交配时用一个巨大的、有营养的精囊喂食它们的配偶。我假设，雌性的求偶角色颠倒和性选择的增加是由于营养食物的限制导致了可供交配的雄性数量的减少(从而减少了可供交配的精巢食物)。这一假说是通过在田野笼子里的不同食物来验证这一假说的。结果表明，与补充蛋白质食物的饮食相比，不良饮食导致：(1)性生活活跃的男性数量减少，(2)女性体型的性选择增加，(3)典型的求爱角色颠倒。这项实验排除了对该物种交配系统差异的其他解释，如种群密度和年龄的差异。这项研究的结论是，由于饮食的这种变化，女性的性选择增加是男性父母投资的相对重要性增加的结果。
Populations of several katydid species (Orthoptera: Tettigoniidae) show large differences in mating system; in some species males compete and females choose mates, whereas in others these courtship roles are reversed. Male katydids feed their mates during mating with a large, nutritious spermatophore. I hypothesized that courtship role reversal and increased sexual selection on females was a result of limitation in nutritious food items causing a decrease in the number of males available for mating (and thus in the spermatophore meals available). This hypothesis was tested by varying diet in field cages of Mormon crickets, Anabrus simplex. Results showed that, in contrast to a diet supplemented with proteinaceous food items, a poor diet resulted in: (1) a decrease in the number of sexually active males, (2) an increase in sexual selection for female body size, and (3) a reversal in the typical courtship roles. The experiment ruled out alternative explanations for variation in the mating system of this species, such as differences in population density and age. The conclusion from this study is that increased sexual selection on females due to such a change in diet is a result of an increase in the relative importance of male parental investment.