THE EFFECTS OF HABITAT ON THE VIGILANCE OF SHOREBIRDS - IS VISIBILITY IMPORTANT
THE EFFECTS OF HABITAT ON THE VIGILANCE OF SHOREBIRDS - IS VISIBILITY IMPORTANT
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DOI：
10.1016/s0003-3472(84)80210-9
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发表时间：
1984-01-01
期刊：
影响因子：
2.5
通讯作者：
METCALFE, NB
中科院分区：
文献类型：
--
作者：
METCALFE, NB
2 spp 研究了猎物附近物体引起的能见度降低的影响。滨鸟。能见度的降低会导致警惕性的提高，这表明尽管伪装程度更高，但脆弱性却增加了。这种增加是由于个体不太能够看到接近的掠食者和它们的邻居。翻石鹬（Arenaria interpres）和紫鹬（Calidris maritima）随着能见度的降低，警惕性水平的提高非常相似，但通过不同的方式实现这些提高：翻石鹬延长了每次警戒扫描的持续时间，而紫鹬扫描的频率更高。提高扫描速率会缩短扫描之间的间隔，从而降低被接近的捕食者措手不及的风险。它还可能降低喂养效率，并且由于食品的处理时间更长，这在转石中可能更为严重，因此导致他们采取不同的策略来提高警惕性。
The effects of reduced visibility caused by objects adjacent to the prey are studied in 2 spp. of shorebird. A reduction in visibility causes an increase in the level of vigilance, indicating an increase in vulnerability despite the greater degree of camouflaging. This increase is due to individuals being less able to see both approaching predators and their neighbors. Turnstones, Arenaria interpres, and purple sandpipers, Calidris maritima, show very similar increases in the level of vigilance with decreasing visibility, but achieve these increases by different means: turnstones lengthen the duration of each vigilant scan, while purple sandpipers scan more often. Increasing scanning rate produces a shortened interval between scans, which reduces the risk of being caught unawares by an approaching predator. It may also reduce feeding efficiency, and this might be more serious in turnstones due to greater handling times for food items, so causing them to adopt a different strategy to increase vigilance.