COLONIAL NESTERS IN A DETERIORATING HABITAT: SITE FIDELITY AND COLONY DYNAMICS OF LESSER SNOW GEESE
COLONIAL NESTERS IN A DETERIORATING HABITAT: SITE FIDELITY AND COLONY DYNAMICS OF LESSER SNOW GEESE
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日益恶化的栖息地中的殖民筑巢者：小雪雁的栖息地保真度和群体动态
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
F. Cooke
中科院分区：
文献类型：
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作者：
B. Ganter;F. Cooke
表现出高度的出生和繁殖性亲育性并在稳定环境中正常繁殖的鸟类，如果它们的栖息地恶化，可能会遭受亲育性成本。雌性小雪雁 (Chen caerulescens caerulescens) 对栖息地高度忠诚；然而，最近繁殖鸟类数量的增加导致一些栖息地的栖息地遭到广泛破坏。我们利用捕获-再捕获建模技术对标记个体进行多次观察，研究了在过去二十年里，在一个快速增长且栖息地质量严重下降的群体中，成年雪雁的繁殖地保真度是否随着时间的推移而发生了变化。此外，我们还检查了繁殖鸟类的年龄结构，以调查出生地对以前群体中心区域的保真度。尽管调查区域及其附近的筑巢和育雏栖息地恶化，但在 10 年期间，仅检测到成虫繁殖地保真度发生了轻微变化。然而，在以前的栖息地中心区域，繁殖鸟类的平均年龄不断增加，表明这些区域缺乏补充；即使中心有空位，幼鸟也一定更喜欢在群落外围定居。加上成年鸟类的少量迁徙，幼鸟的定居模式导致了整个群体位置的长期变化。 1997年6月12日收稿，1997年12月5日接受。
Birds that exhibit a high degree of natal and breeding philopatry and nor- mally breed in stable environments may suffer costs of philopatry if their habitat deterio- rates. Female Lesser Snow Geese (Chen caerulescens caerulescens) are highly site faithful; how- ever, recent increases in numbers of breeding birds have resulted in widespread habitat de- struction in some colonies. Using capture-recapture modeling techniques on multiple re- sightings of marked individuals, we examined whether breeding-site fidelity of adult Snow Geese has changed over time in a colony that has grown rapidly and in which habitat quality has declined severely during the past two decades. In addition, we examined the age struc- ture of breeding birds to investigate natal-site fidelity to formerly central areas of the colony. Only slight changes in adult breeding-site fidelity were detected over 10-year periods, de- spite the deterioration of nesting and brood-rearing habitats in and near the investigated areas. However, increasing mean ages of breeding birds in formerly central areas of the col- ony indicated a lack of recruitment into those areas; young birds must have preferred to settle at the colony periphery even when vacant spaces in the center were available. Together with a small amount of movement by adult birds, the settlement pattern of young birds has led to a long-term shift in the colony location as a whole. Received 12 June 1997, accepted 5 December 1997.