Predation of Juvenile Pacific Salmon by the Common Merganser (Mergus merganser) on Eastern Vancouver Island. II: Predation of Stream-Resident Juvenile Salmon by Merganser Broods
Predation of Juvenile Pacific Salmon by the Common Merganser (Mergus merganser) on Eastern Vancouver Island. II: Predation of Stream-Resident Juvenile Salmon by Merganser Broods
复制标题
温哥华岛东部秋沙鸭 (Mergus merganser) 捕食太平洋鲑鱼幼鱼。
DOI：
10.1139/f87-113
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发表时间：
1987
影响因子：
2.4
通讯作者：
C. Wood
中科院分区：
文献类型：
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作者：
C. Wood
1980年至1982年，在温哥华岛东部的三条溪流中调查了普通秋沙鸭（秋沙鸭）对溪流居民幼鲑的捕食作用。秋沙鸭雏鸭的日鱼消耗量估计为10日龄时雏鸭体重的80%至40日龄时雏鸭体重的40%。 秋沙鸭从未观察到吃少年鲑鱼的潮汐沃茨，但吃他们的淡水河段的溪流研究。通常情况下，育雏居住的淡水达到其纳塔尔的河流，而年轻的，但花了越来越多的时间觅食的潮汐沃茨，因为他们长大了。通过重建人口普查数据中单个育雏的历史，估计了育雏对淡水的生物量（以及潜在消耗量）。这些结果表明，秋沙鸭育雏消耗的顺序82 000-131 000银鲑（Oncorhynchus kisutch）鱼苗在大夸里库姆河6月10日至8月25日。 这相当于……
Predation of stream-resident juvenile salmonids by broods of the common merganser (Mergus merganser) was investigated in three streams on eastern Vancouver Island from 1980 to 1982. Daily fish consumption by merganser ducklings was estimated to range from 80% of body weight for ducklings at 10 d of age to 40% of body weight for those at 40 d of age. Merganser ducklings were never observed to eat juvenile salmonids on tidal waters, but did eat them on the freshwater reaches of streams studied. Typically, broods inhabited only the freshwater reaches of their natal stream while young, but spent progressively more time foraging on tidal waters as they grew older. The biomass of broods (and hence potential consumption) on fresh water was estimated by reconstructing the history of individual broods from census data. These results suggest that merganser broods consumed on the order of 82 000–131 000 coho salmon (Oncorhynchus kisutch) fry in the Big Qualicum River between June 10 and August 25. This is equivalent...