Behaviour and growth of juvenile brown trout exposed to fluctuating flow
Behaviour and growth of juvenile brown trout exposed to fluctuating flow
复制标题
DOI：
10.1111/j.1600-0633.2006.00127.x
复制
发表时间：
2006-03-01
影响因子：
1.8
通讯作者：
Vollestad, LA
中科院分区：
文献类型：
--
作者：
Flodmark, LEW;Forseth, T;Vollestad, LA
褐鲑鱼(Salmo trutta L.)连续三次连续21天暴露在人工室外河道中恒定或波动的水位和流量中，并监测它们的个体行为和社会互动。尽管流量变化很大，但不同处理之间的生长和行为没有明显的差异，生长通常很差。溪流中的社会结构的迹象非常微妙，根据对野外生长和优势的研究结果，在任何处理中，生长率与攻击性/优势行为之间没有明显的关系。因此，在受管制的河流中，流量和水位的每日波动(水峰)不太可能改变褐鲑鱼幼鱼的行为或对其能量周转产生负面影响。几项研究现在表明，如果可以避免搁浅，水峰作用对溪流鲑鱼的直接影响相对较小。因此，未来的研究应集中在可能影响受管制河流生态系统生产力的级联生态效应上。
Parr of brown trout (Salmo trutta L.) were exposed to constant or fluctuating water level and flow in artificial outdoor stream channels during 21 days in three consecutive runs, and their individual behaviour and social interactions were monitored. Despite the large variation in flow, no clear differences in growth, which was generally poor, and behaviour were found between treatments. The signs of a social structure in the stream channels were very subtle and there were no clear relation between growth rate and aggressive/dominant behaviour in any of the treatments in accordance with findings in studies of growth and dominance in the wild. Thus, in regulated rivers, daily fluctuations in flow and water level (hydropeaking) are not likely to alter the behaviour of juvenile brown trout or affect their energy turnover negatively. Several studies now indicate that if stranding can be avoided, hydropeaking has relatively small direct effects on stream salmonids. Therefore, future research should focus on cascading ecological effects that may influence the productivity of the ecosystems in regulated rivers.