来自美国爱达荷大学的John Byers和Stacey Dunn发现雄性叉角羚的配偶数量与后代数量之间的关系证实了Angus Bateman的发现。

-2012年11月9日《科学》

中文翻译


【题目】自然界中的Bateman:掠食后代,降低性别选择的潜力

【译文】性别选择是由雄性竞争配偶引起的,后代数量多的竞争者为胜利的一方。Angus Bateman的早期实验以配偶数量与后代数量之间的相互作用和数量关联为特点,这种数量关联被称为Bateman斜线。性别选择最明显的证据是雌雄异形极大地需要阳性Bateman关联,而且Bateman斜线具有预测性别选择的潜力。然而,正如随机效应一样,环境中的自然选择作用也能影响雄性的成功交配率,而且有一些人认同后者的影响也包含到雄性成功交配率的计算中。在一项历时十年的研究中,叉角羚(Antilocapra americana)每年的观察数据都揭示了阳性Bateman斜线的存在。本研究没有发现随机效应偏斜雄性成功交配率的证据;然而,我们在Bateman斜线中发现了大量年变量,这是由于大量的小鹿被捕食所导致的。这些结果支持Bateman关联的有效性,然而这些结果也表明环境或外来影响可能限制性别选择的潜力。

英文原稿


[Title]: Bateman in Nature: Predation on Offspring Reduces the Potential for Sexual Selection 

[Authors]: John Byers and Stacey Dunn

[Abstract]: Sexual selection is driven by competition for mates, and the advantage of a competitor is determined by the number of offspring it produces. Early experiments by Angus Bateman characterized this interaction, and the quantitative relationship between a male’s number of mates and number of offspring is known as the Bateman slope. Sexual dimorphism, one of the most obvious results of sexual selection, largely requires a positive Bateman relationship, and the slope provides an estimate of the potential for sexual selection. However, natural selection from the environment can also influence male success, as can random effects, and some have argued for inclusion of the latter in calculations of mate success. Data from pronghorn (Antilocapra americana) reveal the presence of a positive Bateman slope in each year of a 10-year study. We found no evidence that random effects skewed male mating success; however, substantial yearly variation in the Bateman slope due to predation on fawns was evident. These results support the validity of the Bateman relationship, yet they also demonstrate that environmental or extrinsic influences can limit the potential for sexual selection.

原文地址  

http://www.sciencemag.org/content/338/6108/802.abstract

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