Matrotrophy and polyandry partially regulate postcopulatory mechanisms and sexual selection in a bimodal viviparous salamander

IF 3 2区 生物学 Q1 ZOOLOGY
Lucía Alarcón-Ríos, Guillermo Velo-Antón
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引用次数: 0

Abstract

The evolution of matrotrophic viviparity creates new scenarios within which evolutionary processes can operate, including postcopulatory events, family conflicts, and selective processes, which are expected to intensify with polyandry. We evaluated the effect of matrotrophic viviparity and polyandry on the reproductive output and offspring fitness of a bimodal reproductive vertebrate, the fire salamander (Salamandra salamandra), which presents two forms of viviparity: larviparity (i.e. females deliver many aquatic larvae) and pueriparity (i.e. females deliver a few terrestrial juveniles). Polyandry is present in both strategies, but matrotrophy only occurs in pueriparity. Analyses of paternity and offspring life-history traits in 18 pueriparous and 13 larviparous mother–offspring arrays suggest the presence of sibling conflicts in pueriparous salamanders, especially with polyandry. However, these postcopulatory processes did not increase reproductive skew in the pueriparous strategy compared to the larviparous one or lead to fitness differences across sires within a clutch, suggesting other selective processes operating earlier in the reproductive sequence. Observed male–female pairs were found to be genetically more similar than other potential pairings, although no relationship between males’ genetic traits and reproductive success was detected. This work advances our understanding of how sibling conflicts and sexual selection affect the evolution of viviparous matrotrophy and mating strategies.
双模胎生蝾螈的繁殖后代机制和性选择的部分调节机制
母性胎生的进化创造了新的情景,进化过程可以在这些情景中进行,包括繁殖后代事件、家族冲突和选择过程,这些过程预计会随着多雄性进化而加剧。我们评估了一种双模生殖脊椎动物--火螈(Salamandra salamandra)--的胎生和多育对生殖产出和后代适应性的影响,这种脊椎动物有两种胎生形式:幼虫胎生(即雌性产下许多水生幼虫)和幼体胎生(即雌性产下少量陆生幼体)。这两种策略都存在多雄现象,但母性退化只发生在产卵期。对18个产卵期和13个幼虫期母子阵列的父子关系和后代生活史特征的分析表明,产卵期蝾螈存在同胞冲突,尤其是多雄性。然而,与幼虫策略相比,这些繁殖后代的过程并没有增加胎生策略的繁殖偏斜,也没有导致一窝中不同父本之间的适应性差异,这表明在繁殖序列的早期还有其他选择性过程。研究发现,观察到的雌雄配对在遗传上比其他潜在配对更相似,尽管没有发现雄性遗传特征与繁殖成功之间的关系。这项研究加深了我们对同胞冲突和性选择如何影响胎生母性和交配策略进化的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.50
自引率
10.70%
发文量
116
审稿时长
6-12 weeks
期刊介绍: The Zoological Journal of the Linnean Society publishes papers on systematic and evolutionary zoology and comparative, functional and other studies where relevant to these areas. Studies of extinct as well as living animals are included. Reviews are also published; these may be invited by the Editorial Board, but uninvited reviews may also be considered. The Zoological Journal also has a wide circulation amongst zoologists and although narrowly specialized papers are not excluded, potential authors should bear that readership in mind.
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