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首页> 外文期刊>Ecology and Evolution >Assessment of individual and conspecific reproductive success as determinants of breeding dispersal of female tree swallows: A capture?￠????recapture approach
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Assessment of individual and conspecific reproductive success as determinants of breeding dispersal of female tree swallows: A capture?￠????recapture approach

机译：评估个体和特定繁殖成功作为母树燕子繁殖扩散的决定因素：一种捕获方法

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Abstract Breeding dispersal is a key process of population structure and dynamics and is often triggered by an individual's breeding failure. In both colonial and territorial birds, reproductive success of conspecifics (RSc) can also lead individuals to change breeding sites after a failure on a site. Yet, few studies have simultaneously investigated the independent contribution of individual reproductive success (RSi) and of RSc on dispersal decision. Here, we develop a modeling framework to disentangle the effects of RSi and RSc on demographic parameters, while accounting for imperfect individual detection and other confounding factors such as age or dispersal behavior in the previous year. Using a 10-year capture?￠????recapture dataset composed of 1,595 banded tree swallows, we assessed the effects of nonmanipulated RSi and RSc on female breeding dispersal in this semicolonial passerine. Dispersal was strongly driven by RSi, but not by RSc. Unsuccessful females were 9.5?￠????2.5 times more likely to disperse than successful ones, depending if they had dispersed or not in the previous year, respectively. Unsuccessful females were also three times less likely to be detected than successful ones. Contrary to theoretical and empirical studies, RSc did not drive the decision to disperse but influenced the selection of the following breeding site once dispersal had been initiated. Because detection of individuals was driven by RSi, which was positively correlated to RSc, assuming a perfect detection as in previous studies may have lead us to conclude that RSc affected dispersal patterns, yet our approach corrected for this bias. Overall, our results suggest that the value and use of RSc as public information to guide dispersal decisions are likely dictated by multiple ecological determinants, such as landscape structure and extent, if this cue is indeed used.
机译：摘要繁殖扩散是种群结构和动态的关键过程，通常是由个体的繁殖失败引起的。在殖民地和领地鸟类中，同种异体（RSc）的繁殖成功也可能导致个体在某个地点发生故障后改变繁殖地点。然而，很少有研究同时调查个体生殖成功（RSi）和RSc对传播决策的独立贡献。在这里，我们开发了一个建模框架，以弄清RSi和RSc对人口统计参数的影响，同时考虑了不完善的个体检测和其他混杂因素，例如年龄或上一年的分散行为。使用10年捕获捕获数据集（由1,595条带状树燕子组成），我们评估了未操纵的RSi和RSc对这种半殖民地雀形目雌性繁殖传播的影响。分散是由RSi强烈驱动的，而不是由RSc驱动的。不成功的女性散布的可能性是成功的女性的9.5倍，是成功者的2.5倍，这取决于他们是否在前一年散布了。不成功的女性被发现的可能性也比成功的女性低三倍。与理论和实证研究相反，RSc并未决定是否进行传播，而是在开始传播后影响了随后繁殖地点的选择。由于对个体的检测是由RSi驱动的，而RSi与RSc正相关，因此，假设像以前的研究一样进行完美检测，可能使我们得出结论，认为RSc影响了分散模式，但我们的方法纠正了这种偏差。总体而言，我们的结果表明，如果确实使用了这种提示，那么RSc作为指导分散决策的公共信息的价值和用途很可能由多种生态决定因素（例如景观结构和范围）决定。

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