HOW FINE SEDIMENT IN RIVERBEDS IMPAIRS GROWTH AND SURVIVAL OF JUVENILE SALMONIDS
HOW FINE SEDIMENT IN RIVERBEDS IMPAIRS GROWTH AND SURVIVAL OF JUVENILE SALMONIDS
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河床上的细沉积物如何影响鲑鱼幼鱼的生长和生存
DOI：
10.1890/03-5190
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发表时间：
2004
影响因子：
5
通讯作者：
C. McNeely
中科院分区：
文献类型：
--
作者：
K. B. Suttle;M. Power;J. Levine;C. McNeely
虽然过多的细沉积物进入河流是众所周知的，以降低鲑鱼产卵栖息地，其对饲养幼鱼的影响一直不清楚。我们实验操纵细床沉积物在北方加州河流和研究响应的少年鲑鱼和食物网支持他们。沉积细泥沙浓度的增加降低了青少年虹鳟的生长和生存。这些下降与无脊椎动物转向穴居类群不可用的猎物和增加钢头活动和伤害在较高水平的细沉积物。沉积的细泥沙和少年钢头增长之间的线性关系表明，没有阈值以下加剧细泥沙输送和储存在砾石层河流将是无害的，但也有任何减少可以产生直接的好处鲑鱼恢复。
Although excessive loading of fine sediments into rivers is well known to degrade salmonid spawning habitat, its effects on rearing juveniles have been unclear. We experimentally manipulated fine bed sediment in a northern California river and examined responses of juvenile salmonids and the food webs supporting them. Increasing concentrations of deposited fine sediment decreased growth and survival of juvenile steelhead trout. These declines were associated with a shift in invertebrates toward burrowing taxa unavailable as prey and with increased steelhead activity and injury at higher levels of fine sediment. The linear relationship between deposited fine sediment and juvenile steelhead growth suggests that there is no threshold below which exacerbation of fine-sediment delivery and storage in gravel bedded rivers will be harmless, but also that any reduction could produce immediate benefits for salmonid restoration.