Immigrants are attracted by local pre-breeders and recruits in a seabird colony.

Immigrants are attracted by local pre-breeders and recruits in a seabird colony.
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移民被当地的预繁育者和海鸟栖息地的新成员所吸引

DOI:
10.1111/1365-2656.12206
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发表时间:
2014
期刊:
The Journal of animal ecology
影响因子:
--
通讯作者:
Becker PH
Becker PH
中科院分区:
--
文献类型:
--
作者:
Szostek KL;Schaub M;Becker PH

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移民是影响人口动态的一个主要人口因素。然而,由于方法上的困难,对移民的程度和影响移民的因素没有进行充分的研究。这也适用于海鸟群体。我们根据对一个用应答器标记的普通燕鸥群体的长期研究,使用贝叶斯综合种群模型估计了每年的移民人数,该模型将群体规模和生产力与个体生活史联系起来。发现移民人数的年度波动很大。为了确定群体特异性协变量是否影响移民,我们将移民的数量与繁殖地质量的各种代理变量相关联,特别是群体大小,生产力,当地亚成体和当地新兵的数量。本地补充和本地亚成体的数量与移民数量呈强正相关。我们发现移民率的变化对群体增长率的变化有很大的影响,比本地补充或成体存活率的变化更大。总的来说,结果表明移民强烈影响群体增长率,移民背后的驱动力是纳塔尔分散,移民是被当地招募的。
Immigration is a major demographic factor shaping population dynamics. However, due to methodological difficulties, the extent of immigration and factors affecting immigration are insufficiently studied. This is also true for seabird colonies.We estimated annual immigration based on a long‐term study of a colony of common ternsSterna hirundomarked with transponders, using a Bayesian integrated population model that links colony size and productivity with individual life histories.Strong annual fluctuations in the number of immigrants were found. To identify whether colony‐specific covariates influenced immigration, we related the number of immigrants to various proxy variables for breeding site quality, specifically colony size, productivity, number of local subadults and local recruits. Numbers of local recruits and local subadults showed strong positive correlations with number of immigrants.We found that variation in immigration rate had strongly contributed to variation in colony growth rate, more so than variation in local recruitment or adult survival.Collectively, results suggest that immigration strongly affects colony growth rate, that the driving force behind immigration is natal dispersal and that immigrants were attracted by local recruits.
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