Increase in song frequency decreases spermatophore size:: correlative evidence of a macroevolutionary trade-off in katydids (Orthoptera: Tettigoniidae)
Increase in song frequency decreases spermatophore size:: correlative evidence of a macroevolutionary trade-off in katydids (Orthoptera: Tettigoniidae)
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DOI：
10.1111/j.1420-9101.2006.01298.x
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发表时间：
2007-05-01
影响因子：
2.1
通讯作者：
Gwynne, D. T.
中科院分区：
文献类型：
--
作者：
Del Castillo, R. C.;Gwynne, D. T.
在许多Katydids中，雄性用一个大的凝胶状精荚喂养他的配偶。大多数物种的雄性也会发出精心制作的叫声。我们预测，由于这两个昂贵的性状之间的权衡，精荚大小和呼叫频率之间的负相关关系。我们的比较分析，控制生育和身体大小支持这一预测。虽然呼叫频率预计会随着身体大小的增加而减少，但在控制了雌激素后，这两个变量都不相关。最后，鉴于歌曲频率和精荚大小可能是性选择的目标，我们研究了这些变量和性大小二型性（SSD），可以通过性选择对身体大小的影响之间的关系。我们发现，只有女性的身体大小是正相关的SSD，这表明自然和/或性选择女性的身体大小可能比性选择男性和精荚大小。
In many katydids, the male feeds his mate with a large gelatinous spermatophore. Males of most species also produce elaborate calling songs. We predicted a negative relationship between spermatophore size and call frequency because of trade-offs between these two costly traits. Our comparative analysis controlling phylogeny and body size supported this prediction. Although call frequency is expected to decrease with increasing body size, after controlling for phylogeny, both variables were not related. Finally, given that song frequency and spermatophore size are likely targets of sexual selection, we examined the relationship between these variables and sexual size dimorphism (SSD) which can be influenced by sexual selection on body size. We found that only female body size was positively related to SSD, suggesting that natural and/or sexual selection on female body size may be stronger than sexual selection on male and spermatophore size.