Spatiotemporal Variation and Size‐Selective Predation on Hatchery‐ and Wild‐Born Juvenile Chum Salmon at Marine Entry by Nearshore Fishes in Southeast Alaska
Spatiotemporal Variation and Size‐Selective Predation on Hatchery‐ and Wild‐Born Juvenile Chum Salmon at Marine Entry by Nearshore Fishes in Southeast Alaska
复制标题
时空变化和大小——阿拉斯加东南部近岸鱼类对孵化场和野生鲑鱼的选择性捕食
DOI:
10.1002/mcf2.10091
复制
发表时间:
2019
影响因子:
1.7
通讯作者:
Beaudreau, Anne H.
中科院分区:
文献类型:
--
作者:
Duncan, Douglas H.;Beaudreau, Anne H.
Juvenile Pacific salmonOncorhynchusspp. experience high mortality at marine entry, yet our quantitative understanding of predation during this critical period is limited. We evaluated spatial, temporal, and size‐based patterns of predation on hatchery‐ and wild‐born juvenile Chum SalmonO. ketaby two abundant predators in Southeast Alaska estuaries: the Pacific Staghorn SculpinLeptocottus armatusand Dolly VardenSalvelinus malma. For the predators we sampled, Chum Salmon comprised 4.5% of the diet by weight for Pacific Staghorn Sculpin (n=937) and 19.6% of the diet by weight for Dolly Varden (n=448), with 88% of the individual Chum Salmon consumed originating from hatcheries. Variation in occurrence of Chum Salmon in diets was driven by date, site, and local Chum Salmon density. The quantity of Chum Salmon consumed by Pacific Staghorn Sculpin varied with predator length, Chum Salmon density, and the proportion of hatchery fish present; however, date was the only important predictor for Dolly Varden. The mean length of Chum Salmon in the diets of both predators was significantly shorter than that of concurrent hatchery releases or seine catches, suggesting size‐selective predation on smaller individuals. This pattern indicates that hatchery strategies of releasing larger individuals may reduce the initial vulnerability of hatchery salmon to estuarine predators.
登录
查看更多内容
影响因子:
1.4
作者:
M. Sturdevant;Emily Fergusson;N. Hillgruber;Carl Reese;J. Orsi;R. Focht;A. Wertheimer;Bill Smoker
通讯作者:
Bill Smoker
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
E. L. Brannon;D. Amend;M. Cronin;J. E. Lannan;S. Lapatra;W. Mcneil;R. E. Noble;Charlie E. Smith;A. Talbot;G. Wedemeyer;H. Westers
通讯作者:
H. Westers
DOI:
--
发表时间:
1962
期刊:
影响因子:
--
作者:
K. F. Lagler;A. T. Wright
通讯作者:
A. T. Wright
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
Emily J. Whitney;A. Beaudreau;Douglas H. Duncan
通讯作者:
Douglas H. Duncan
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
C. Levings;C. D. Mcallister;B. D. Chang
通讯作者:
B. D. Chang