Terminal investment strategies and male mate choice: Extreme tests of Bateman
Terminal investment strategies and male mate choice: Extreme tests of Bateman
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DOI：
10.1093/icb/45.5.838
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发表时间：
2005-11-01
影响因子：
2.6
通讯作者：
Kasumovic, MM
中科院分区：
文献类型：
--
作者：
Andrade, MCB;Kasumovic, MM
贝特曼原理预测，性选择的强度取决于两性交配成功后繁殖力的增长率（贝特曼斜率）。增加幅度较大的性别（通常是男性）处于更激烈的性选择中，并且预计会竞争获得性选择不那么激烈的性别（通常是女性）。在贝特曼及其思想的现代改进下，父母投资的差异是定义贝特曼斜率和性别角色的关键。其他理论预测交配投资的性别差异，或任何降低男性潜在繁殖率的支出，也可以控制性别角色。我们关注的是这样一种系统中的性行为：雄性的父系投入很低，但它们一生中往往只交配一次，之后往往被雌性杀死。这些雄性的交配努力（=终端投资）很高，许多形式的投资理论可能预测性别角色的反转。我们在蜘蛛样本中没有发现性别角色逆转的定性证据，表明这种极端的雄性投资模式。我们还提供了末端投资红背蜘蛛（Latrodectus hasselti）的新数据。男性红背人的贝特曼斜率相对较陡，正如贝特曼所预测的那样，几乎没有证据表明存在角色逆转。相反，尽管女性的生殖价值差异很大，但男性具有竞争性，表现出有限的挑肥拣瘦。本研究支持了高雄性交配投资加上低亲代投资可能使雄性倾向于挑食，但不会导致角色反转的观点。我们支持使用贝特曼斜率来预测性别角色的效用，即使在具有极端雄性交配投资的系统中。
Bateman's principle predicts the intensity of sexual selection depends on rates of increase of fecundity with mating success for each sex (Bateman slopes). The sex with the steeper increase (usually males) is under more intense sexual selection and is expected to compete for access to the sex under less intense sexual selection (usually females). Under Bateman and modern refinements of his ideas, differences in parental investment are key to defining Bateman slopes and thus sex roles. Other theories predict sex differences in mating investment, or any expenditures that reduce male potential reproductive rate, can also control sex roles. We focus on sexual behaviour in systems where males have low paternal investment but frequently mate only once in their lifetimes, after which they are often killed by the female. Mating effort (=terminal investment) is high for these males, and many forms of investment theory might predict sex role reversal. We find no qualitative evidence for sex role reversal in a sample of spiders that show this extreme male investment pattern. We also present new data for terminally-investing redback spiders (Latrodectus hasselti). Bateman slopes are relatively steep for male redbacks, and, as predicted by Bateman, there is little evidence for role reversal. Instead, males are competitive and show limited choosiness despite wide variation in female reproductive value. This study supports the proposal that high male mating investment coupled with low parental investment may predispose males to choosiness but will not lead to role reversal. We support the utility of using Bateman slopes to predict sex roles, even in systems with extreme male mating investment.