Lipid content and energy density of forage fishes from the northern Gulf of Alaska

被引:258
作者
Anthony, JA
Roby, DD
Turco, KR
机构
[1] US Geol Survey, Oregon Cooperat Fish & Wildlife Res Unit, Biol Resources Div, Corvallis, OR 97331 USA
[2] Oregon State Univ, Dept Fisheries & Wildlife, Corvallis, OR 97331 USA
[3] Univ Alaska, Inst Marine Sci, Fairbanks, AK 99775 USA
基金
美国海洋和大气管理局;
关键词
energetics; location; proximate composition; reproductive status; size; season;
D O I
10.1016/S0022-0981(00)00159-3
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 [生物信息与计算生物学]; 0713 [生态学];
摘要
Piscivorous predators can experience multi-fold differences in energy intake rates based solely on the types of fishes consumed. We estimated energy density of 1151 fish from 39 species by proximate analysis of lipid, water, ash-free lean dry matter, and ash contents and evaluated factors contributing to variation in composition. Lipid content was the primary determinant of energy density, ranging from 2 to 61% dry mass and resulting in a five-fold difference in energy density of individuals (2.0-10.8 kJg(-1) wet mass). Energy density varied widely within and between species. Schooling pelagic fishes had relatively high or low values, whereas nearshore demersal fishes were intermediate. Pelagic species maturing at a smaller size had higher and more variable energy density than pelagic or nearshore species maturing larger. High-lipid fishes had less water and mon protein than low-lipid fishes. Ln some forage fishes, size, month, reproductive status, or location contributed significantly to intraspecific variation in energy density. Differences in quality an sufficient to potentially affect diet selection of breeding seabirds, especially when transporting food for their young to the nest site. Published by Elsevier Science B.V.
引用
收藏
页码:53 / 78
页数:26
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