大雷亚地区的滥交:一种遗传方法

IF 1.1 4区 生物学 Q4 BEHAVIORAL SCIENCES acta ethologica Pub Date : 2022-06-30 DOI:10.1007/s10211-022-00398-x
Mónica B. Martella, Mauricio Renny, Marina B. Chiappero, Joaquín L. Navarro
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摘要

美洲大鲵(Rhea americana)有一个社会交配系统,几只雌性在公共巢穴中产卵,雄性孵化和照顾小鸡。迄今为止使用的行为观察方法还不足以揭示雌性是否形成了一个有凝聚力的“后宫”,野生环境中是否同时发生了一妻多夫制(滥交),以及每一窝发生了多父制。我们首次使用分子标记对阿根廷中部野生大土耳羊种群的繁殖个体及其后代进行了基于基因型的兄弟姐妹和亲子关系分配分析。在4800公顷的范围内,我们发现了5个巢,从中我们收集了完整的卵和孵化雄性的羽毛。我们成功地在8个微卫星位点上确定了3只雄性和141只后代的基因型。我们根据后代的基因型推断出参与交配的父母及其基因型。共有37只雄性和47只雌性参与了指定的配对,其中一只孵化中的雄性没有使任何卵子受精。我们获得了三个主要的新结果,对美洲豹的交配制度有启发:(a)雌性不形成“后宫”;(b)有滥交的证据;(c)孵卵雄性不会为巢中的大多数后代做父亲。大Rheas的策略是同时与几个个体交配,并在不同的巢穴中产卵,而不管孵化的雄性是否为这些卵的父亲。这些结果为了解这一比率的复杂交配系统提供了新的和重要的一步。
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Promiscuity in the Greater Rhea: a genetic approach

Greater Rheas (Rhea americana) have a social mating system in which several females lay eggs in communal nests, and males incubate and care for chicks. Behavioural observation methods used so far are insufficient to unravel if females form a cohesive “harem,” simultaneous polyandry (promiscuity) occurs in the wild, and multipaternity occurs in each clutch. We used molecular markers to conduct for the first time a genotype-based sibship and parentage assignment analysis among reproductive individuals and their offspring, within and between nests, in a wild Greater Rhea population of central Argentina. In a 4800-ha area, we found five nests from which we collected complete clutches and feathers of incubating males. We successfully determined the genotypes of three males and all 141 offspring at 8 microsatellite loci. We inferred the parents involved in matings and their genotypes based on offspring’s genotypes. A total of 37 males and 47 females were engaged in the assigned pairings, and one incubating male did not fertilise any egg. We obtained three main novel results that enlighten the mating system of Rheas: (a) females do not form “harems”; (b) there is evidence of promiscuity; and (c) incubator male does not father the majority of offspring from his nest. The strategy of Greater Rheas is to copulate with several individuals simultaneously and lay eggs in different nests, independently of whether or not the incubating male fathers those eggs. These results provide a new and significant step in understanding the complex mating system of this ratite.

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来源期刊
acta ethologica
acta ethologica 生物-动物学
CiteScore
1.90
自引率
0.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: acta ethologica publishes empirical and theoretical research papers, short communications, commentaries, reviews and book reviews as well as methods papers in the field of ethology and related disciplines, with a strong concentration on the behavior biology of humans and other animals. The journal places special emphasis on studies integrating proximate (mechanisms, development) and ultimate (function, evolution) levels in the analysis of behavior. Aspects of particular interest include: adaptive plasticity of behavior, inter-individual and geographic variations in behavior, mechanisms underlying behavior, evolutionary processes and functions of behavior, and many other topics. acta ethologica is an official journal of ISPA, CRL and the Portuguese Ethological Society (SPE)
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