Day and Night Foraging of Red Knots (Calidris canutus) during Spring Stopover in Virginia, USA
作者： Jonathan B. Cohen , Brian D. Gerber , Sarah M. Karpanty , James D. Fraser , Barry R. Truitt
DOI: 10.1675/063.034.0309
关键词: Calidris 、 Daylight 、 Barrier island 、 Ecology 、 Fishery 、 Predation 、 Geography 、 Horseshoe crab 、 Foraging 、 Bay 、 Polyphemus
摘要: Abstract. Long-jump migrant shorebirds have brief windows during spring stopover to acquire the energy needed complete migration. Red Knots (Calidris canutus) refueling on Horseshoe Crab (Limulus polyphemus) eggs in Delaware Bay can meet their needs foraging only by day. In nearby Virginia, thousands of stop over, but primarily low-quality, hard-shelled prey are available. One tactic may use demands with such might be extend time feeding at night. To estimate length day daylight was studied three periods (2008 2010), and night 2010. foraged 76 ± 3 SE% 2008 2009 combined, 59 3% 2010, 3-minute observations. 51 7% a continuous 7-h daytime observation 77 5% 8-h same island. G...
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