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An alternative hypothesis for the evolution of same-sex sexual behaviour in animals.
Nature Ecology & Evolution ( IF 16.8 ) Pub Date : 2019-11-18 , DOI: 10.1038/s41559-019-1019-7
Julia D Monk 1 , Erin Giglio 2 , Ambika Kamath 3, 4 , Max R Lambert 4 , Caitlin E McDonough 5
Affiliation  

Same-sex sexual behaviour (SSB) has been recorded in over 1,500 animal species with a widespread distribution across most major clades. Evolutionary biologists have long sought to uncover the adaptive origins of 'homosexual behaviour' in an attempt to resolve this apparent Darwinian paradox: how has SSB repeatedly evolved and persisted despite its presumed fitness costs? This question implicitly assumes that 'heterosexual' or exclusive different-sex sexual behaviour (DSB) is the baseline condition for animals, from which SSB has evolved. We question the idea that SSB necessarily presents an evolutionary conundrum, and suggest that the literature includes unchecked assumptions regarding the costs, benefits and origins of SSB. Instead, we offer an alternative null hypothesis for the evolutionary origin of SSB that, through a subtle shift in perspective, moves away from the expectation that the origin and maintenance of SSB is a problem in need of a solution. We argue that the frequently implicit assumption of DSB as ancestral has not been rigorously examined, and instead hypothesize an ancestral condition of indiscriminate sexual behaviours directed towards all sexes. By shifting the lens through which we study animal sexual behaviour, we can more fruitfully examine the evolutionary history of diverse sexual strategies.

中文翻译:

动物同性性行为进化的另一种假设。

同性性行为(SSB)已记录在1,500多种动物中,并在大多数主要进化枝中广泛分布。进化生物学家长期以来一直试图揭示“同性恋行为”的适应性起源,以试图解决这种明显的达尔文主义悖论:尽管推测了适应性成本,但SSB是如何反复演变并持续存在的?这个问题隐含地假设“异性恋”或排他的异性性行为(DSB)是动物的基本条件,而SSB正是从该条件进化而来的。我们质疑SSB必定会带来一个进化难题的观点,并建议文献中包括关于SSB的成本,收益和来源的未经检验的假设。相反,我们为SSB的进化起源提供了另一种零假设,通过微妙的转变,摆脱了SSB的起源和维护是一个需要解决的问题的期望。我们认为,未经严格检验将DSB视为祖先的隐含假设,而是假设了针对所有性别的不分皂白的性行为的祖先条件。通过改变研究动物性行为的视角,我们可以更有效地研究各种性策略的进化史。
更新日期:2019-11-18
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