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首页> 外文期刊>Ethology >Testosterone and Linear Social Dominance Status in Captive Male Dabbling Ducks in Winter
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Testosterone and Linear Social Dominance Status in Captive Male Dabbling Ducks in Winter

机译：冬季圈养雄性涉水鸭的睾丸激素和线性社会优势地位

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摘要

Dominance hierarchies play an important role in avoidance and/or solving conflicts in gregarious species, In dabbling ducks (Anas species), dominance allows for feeding-site monopolization in winter quarters where resources are generally limited. In addition, male social rank should theoretically favour access to mates. Dominance rank can be associated with morphological traits, and is often correlated with aggressiveness, a behavioural trait generally related to high testosterone levels, In this study, we investigated the existence of a winter group structure based on dominance relationships and tested for a linear hierarchy, in three species of captive male dabbling ducks (mallard Anas platyrhynchos, pintail A, acuta and wigeon A, penelope). We then analysed the relationship between dominance ranks, morphological parameters and testosterone levels measured in early (Oct.) and mid-winter (Dec./Jan.).. We found that the three male groups of the three species exhibited a linear hierarchy. Testosterone levels differed during winter and between species. Morphologic measurements, body mass and body condition were not correlated with individual dominance ranks, whereas dominant males had higher testosterone levels than subordinates. The slopes of the relationships were similar between species and winter period, but the y-intercepts differed between species and between early and mid-winter phases. The linear hierarchy found in the three species indicates that dominance relationships strongly structuredabbling duck groups in winter Lack of correlation between rank and morphological characters, but correlation of rank with testosterone levels suggests that social rank is more dependent on behavioural traits such as aggressive behaviour. The differences between species and winter periods are discussed in relation to migration and wintering phenology.
机译：优势等级在避免和/或解决群居物种中的冲突方面起着重要作用。在涉猎鸭子（Anas物种）中，优势可以使通常在资源有限的冬季栖息地垄断。另外，理论上，男性社会地位应该有利于与人交往。优势等级可以与形态特征相关联，并且通常与侵略性相关，侵略性通常与高睾丸激素水平有关。在这项研究中，我们基于优势关系调查了冬季群体结构的存在并测试了线性等级，在三种圈养的雄性野鸭中（野鸭Anas platyrhynchos，长尾A A，acuta和wigeon A，佩内洛普）。然后，我们分析了10月初（十月）和冬季（十二月/一月）测得的优势等级，形态参数和睾丸激素水平之间的关系。我们发现，这三个物种的三个雄性群体表现出线性等级关系。冬季和不同物种之间的睾丸激素水平不同。形态学测量，体重和身体状况与个体优势等级无关，而优势男性的睾丸激素水平高于下属。物种与冬季之间的关系斜率相似，但物种之间以及初冬中期之间的y轴截距不同。在这三个物种中发现的线性等级结构表明，优势关系在冬季强烈地构成了鸭群，等级与形态特征之间缺乏相关性，但是等级与睾丸激素水平的相关性表明社会等级更依赖于行为特征，例如攻击性行为。讨论了物种和冬季之间的差异，涉及迁移和越冬物候。

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