Seasonal shift in the effect of predators on juvenile Atlantic salmon (Salmo salar) energetics.
Seasonal shift in the effect of predators on juvenile Atlantic salmon (Salmo salar) energetics.
复制标题
捕食者对幼年大西洋鲑鱼(Salmo salar)能量影响的季节性变化。
DOI:
10.1139/f2011-123
复制
发表时间:
2011
期刊:
影响因子:
--
通讯作者:
Folt,CarolL
中科院分区:
文献类型:
--
作者:
Ward,DarrenM;Nislow,KeithH;Folt,CarolL
Predator effects on prey populations are determined by the number of prey consumed and effects on the traits of surviving prey. Yet the effects of predators on prey traits are rarely evaluated in field studies. We measured the effects of predators on energetic traits (consumption and growth rates) of juvenile Atlantic salmon (Salmo salar) in a large-scale field study. Salmon fry were released at 18 sites that encompassed a wide range of predatory slimy sculpin (Cottus cognatus) abundance. We sampled salmon after 21 and 140 days to measure salmon growth and estimate consumption using a mass-balance model of methylmercury accumulation. Salmon population density was reduced fivefold at sites with abundant sculpin. Over the early season, salmon consumed less where sculpin were abundant, suggesting that reduced foraging under predation risk contributed to predator-caused mortality. In contrast, over the late season, salmon grew more where sculpin were abundant, suggesting that compensatory growth at reduced salmon population density moderated predator-caused mortality. Predator effects on prey energetics can drive variation in survival and growth, with important consequences for population dynamics.
登录
查看更多内容
影响因子:
2.7
作者:
Lepak, Jesse M.;Robinson, Jason M.;Josephson, Daniel C.
通讯作者:
Josephson, Daniel C.
影响因子:
2.5
作者:
Kaspersson, Rasmus;Hojesjo, Johan;Pedersen, Stig
通讯作者:
Pedersen, Stig
影响因子:
1.4
作者:
Ward, D. M.;Nislow, K. H.;Folt, C. L.
通讯作者:
Folt, C. L.
DOI:
--
发表时间:
1996
期刊:
影响因子:
--
作者:
D. Rowan;J. Rasmussen
通讯作者:
J. Rasmussen
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
K. Nislow;J. Armstrong;J. Grant
通讯作者:
J. Grant