Effects of the landscape on shorebird movements at spring migration stopovers
Effects of the landscape on shorebird movements at spring migration stopovers
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DOI：
10.2307/1370481
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发表时间：
1997-08-01
期刊：
影响因子：
3.1
通讯作者：
Parent, AH
中科院分区：
文献类型：
--
作者：
Farmer, AH;Parent, AH
1992年至1995年，我们监测了115个无线电标记的胸滨鹬（Calidris melanotos）在三个迁移中途停留在北美大平原的湿地间的运动。在中途停留时，人们的行动非常局限。超过40%的鸟类没有在湿地之间移动，超过90%的鸟类从原始释放地点移动不到10公里。鸟类被释放的湿地的特征并不影响鸟类的运动。然而，周围景观的结构解释了高达46%的个别鸟类运动的变化。随着湿地之间距离的减小，以及由湿地组成的景观比例的增加，单个鸟类在湿地之间的移动更加频繁，并且从它们的释放地点移动更长的距离。这些运动模式表明，一个更连接的景观允许滨鸟利用更多的觅食地点，降低搜索成本，结果与觅食理论一致。我们估计一定程度的景观连接在湿地复合功能作为一个单一的大型湿地，以鹬喂养模式。我们的数据提供了支持的想法，即复杂的小，密集的湿地可以是重要的迁移中途停留，并可能具有显着的保护价值。
We monitored the inter-wetland movements of 115 radio-tagged Pectoral Sandpipers (Calidris melanotos) at three migration stopovers in the Great Plains of North America during April and May from 1992 to 1995. While resident at a stopover, individuals were very localized in their movements. Over 40% of the birds made no inter-wetland movements, and over 90% of individuals moved less than 10 km from their original release site. Characteristics of wetlands where birds were released did not affect bird movements. However, the structure of the surrounding landscape explained up to 46% of variation in individual bird movements. As the distance between wetlands decreased, and the proportion of the landscape composed of wetlands increased, individual birds moved between wetlands more frequently and moved longer distances from their release site. These movement patterns indicate that a more connected landscape allows shorebirds to exploit more feeding sites with reduced searching costs; a result consistent with foraging theory. We estimate a degree of landscape connectivity at which a wetland complex functions as a single large wetland as measured by sandpiper feeding patterns. Our data provide support for the idea that complexes of small, closely spaced wetlands can be important migration stopovers and may have significant conservation value.