Winter Movement Dynamics of Black Brant
Winter Movement Dynamics of Black Brant
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黑麸质冬季运动动态
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. Roser
中科院分区：
文献类型：
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作者：
M. Lindberg;D. Ward;T. Tibbitts;J. Roser
摘要虽然北美鹅是根据其繁殖分布进行管理的，但这些繁殖种群的动态可能会受到冬季发生的事件的影响。首都种鹅的出生率可能会受到越冬条件的影响，死亡率可能会受到迁徙时间和越冬分布的影响，繁殖种群之间的迁入和迁出可能取决于冬季迁徙和配对时间。利用捕获-再捕获模型研究了1998年3月至2000年3月间美国墨西哥和南加州越冬地黑褐天牛（Branta bernicla nigricans）的活动影响因素。虽然布兰特表现出很高的概率（>0.85），每月和每年的忠实度越冬地点，我们抽样，我们观察到所有越冬地点之间的运动。冬季内和冬季之间的运动概率呈负相关的站点之间的距离。我们观察到一个更高的概率都向南运动之间的冬季（3月至12月）和向北运动之间的冬季。冬季之间的运动可能受到栖息地质量的空间和时间变化的最强烈影响，因为我们看到运动模式与对比环境条件一致（例如，拉尼娜和厄尔尼诺南方涛动周期）。每月的迁移与迁移模式有关，也可能受到各地点生境条件差异的影响。冬季运动的模式表明，一个网络的越冬地点可能是必要的有效保护布兰特。
Abstract Although North American geese are managed based on their breeding distributions, the dynamics of those breeding populations may be affected by events that occur during the winter. Birth rates of capital breeding geese may be influenced by wintering conditions, mortality may be influenced by timing of migration and wintering distribution, and immigration and emigration among breeding populations may depend on winter movement and timing of pair formation. We examined factors affecting movements of black brant (Branta bernicla nigricans) among their primary wintering sites in Mexico and southern California, USA, (Mar 1998–Mar 2000) using capture–recapture models. Although brant exhibited high probability (>0.85) of monthly and annual fidelity to the wintering sites we sampled, we observed movements among all wintering sites. Movement probabilities both within and among winters were negatively related to distance between sites. We observed a higher probability both of southward movement between winters (Mar to Dec) and northward movement between months within winters. Between-winter movements were probably most strongly affected by spatial and temporal variation in habitat quality as we saw movement patterns consistent with contrasting environmental conditions (e.g., La Niña and El Niño southern oscillation cycles). Month-to-month movements were related to migration patterns and may also have been affected by differences in habitat conditions among sites. Patterns of winter movements indicate that a network of wintering sites may be necessary for effective conservation of brant.