The feeding and energetics of stream-resident trout in winter*
The feeding and energetics of stream-resident trout in winter*
复制标题
冬季溪流鳟鱼的摄食和能量*
DOI：
10.1111/j.1095-8649.1987.tb05254.x
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发表时间：
1987
影响因子：
2
通讯作者：
G. Power
中科院分区：
文献类型：
--
作者：
R. Cunjak;G. Power
在两个冬天的时间里，研究了小溪和褐鲑鱼在加拿大一条温带溪流中的摄食情况。胃部分析表明，整个冬季都会继续觅食。这两个物种有着相似的饮食习惯。尽管不断取食，但条件因素在初冬显著下降，并一直保持在低水平，直到春季，这表明初冬耗尽了脂肪储备。冬季的能量(卡路里)摄入量与夏末或春季相似，因此不是冬季状况较低的原因。对于未成熟的鱼和刚产卵的鱼来说，从饲养中获得的能量不足以抵消初冬期间维持新陈代谢的成本。这表明，溪栖鲑鱼在适应11月/12月迅速下降的水温过程中出现了代谢缺陷。这种现象对越冬生存具有重要的生理意义。
The feeding of brook and brown trout in a temperate Canadian stream was studied over two winters. Stomach analyses indicate that feeding continues throughout the winter. Both species had similar diets. Despite continuous feeding, condition factors declined significantly in early winter and remained low until the spring, suggesting an early-winter depletion of lipid reserves. Energy (calorific) intake was similar in winter to that found in late summer or spring and therefore was not the cause of low winter condition. The derived energy from feeding was insufficient to offset the costs of maintenance metabolism in the early winter period, for both immature and recently spawned fish. It is suggested that stream-dwelling trout suffer a metabolic deficit during acclimation to rapidly declining water temperatures in November/December. Such a phenomenon has important physiological implications for overwinter survival.