Selection against immigrants in wild seabird populations,Ecology Letters

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Selection against immigrants in wild seabird populations
Ecology Letters ( IF 7.6 ) Pub Date : 2020-10-14 , DOI: 10.1111/ele.13624
Christophe Barbraud ₁ , Karine Delord ₁

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Immigration is a major demographic parameter shaping population dynamics and is an important driver of eco‐evolutionary patterns, but the fitness consequences for individuals following their settlement to a new population (immigrants) remain poorly tested in wild animal populations, particularly among long‐lived species. Here we show that immigrants have a lower fitness than residents in three wild seabird populations (wandering albatross Diomedea exulans, southern fulmar Fulmarus glacialoides, snow petrel Pagodroma nivea). Across all species and during a 32‐year period, immigrants made on average −9 to 29% fewer breeding attempts, had 5–31% fewer fledglings, had 2–16% lower breeding success and produced 6–46% fewer recruits. Female immigration and male residency were also favored through differences in breeding performance. We provide evidence for selection against immigrants in wild populations of long‐lived species and our results are consistent with female‐biased dispersal in birds being driven by asymmetric limiting resources and the competitive ability of dispersers vs. non‐dispersers.

中文翻译：

选择野生海鸟种群中的移民

移民是塑造人口动态的主要人口统计参数，并且是生态进化模式的重要驱动力，但在野生动物种群中，尤其是在长寿物种中，适应新种群（移民）后对个体的适应性后果仍然测试不足。在这里，我们显示，与三个野生海鸟种群（流浪信天翁Diomedea exulans，南部海ful Fulmarus glacialoides，雪海燕Pagodroma nivea）相比，移民的适应性要比居民低。）。在所有物种中，在32年内，移民的育种尝试平均减少了-9％至29％，幼雏减少了5-31％，繁殖成功率降低了2-16％，而新兵的产生则减少了6-46％。繁殖表现的差异也有利于女性移民和男性居留。我们提供了选择针对长寿物种野生种群中的移民的证据，我们的结果与不对称限制资源以及分散剂与非分散剂竞争能力的驱动下，女性偏向鸟类的散布是一致的。

更新日期：2020-12-12

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