Condition dependence of male life span and calling effort in a field cricket
Condition dependence of male life span and calling effort in a field cricket
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DOI：
10.1111/j.1558-5646.2008.00318.x
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发表时间：
2008-04-01
期刊：
影响因子：
3.3
通讯作者：
Gwynne, Darryl T.
中科院分区：
文献类型：
--
作者：
Judge, Kevin A.;Ting, Janice J.;Gwynne, Darryl T.
性选择的特征被认为是对艳丽的雄性施加生存成本。最近的实证研究发现，男性显示和生存在一个领域的蟋蟀物种（直翅目，蟋蟀科，蟋蟀）之间的负相关，没有证据表明，对老年男性的交配偏见。然而，在大多数物种中，雄性的生存和装饰是正相关的，年长的雄性往往比年轻的雄性具有交配成功的优势。这些研究结果表明，男性质量和生存呈正相关，但这一假设需要更多的测试。我们测量的条件依赖的男性生存和呼吁努力在另一个grylline，蟋蟀，老年男性先前已被证明有更大的交配成功。我们通过操纵饮食来改变条件，并测量男性的寿命和呼叫努力，以评估这些特征的相对条件依赖性。高和中等条件的男性生存时间比低条件的男性，和高条件的男性呼吁更多的中等和低条件的男性。不同的条件治疗之间的呼叫努力的差异并不明显，在生命的早期，但出现了男性年龄。我们讨论了可能的解释，我们的研究和对比结果之间的差异，如以前的格里林工作。
Sexually selected traits are thought to impose survival costs on showy males. Recent empirical work found a negative relationship between male display and survival in a field cricket species (Orthoptera, Gryllidae, Gryllinae) where there is no evidence of a mating bias toward older males. In most species, however, male survival and ornamentation are positively correlated, and older males often have a mating success advantage over younger males. These findings suggest that male quality and survival are positively correlated, but more tests of this hypothesis are needed. We measured the condition dependence of male survival and calling effort in another grylline, Gryllus pennsylvanicus, where older males have previously been shown to have greater mating success. We varied condition by manipulating diet, and measured male life span and calling effort to assess the relative condition dependence of these traits. High- and medium-condition males survived longer than low-condition males, and high-condition males called more than medium- and low-condition males. Differences in calling effort among the condition treatments were not apparent early in life, but emerged as males aged. We discuss possible explanations for the differences between our study and contrasting results such as the previous grylline work.