Movement patterns of small benthic fish in lowland headwater streams
Movement patterns of small benthic fish in lowland headwater streams
复制标题
低地源头溪流中小型底栖鱼类的运动模式
DOI：
10.1111/fwb.12214
复制
发表时间：
2013
影响因子：
2.7
通讯作者：
M.
中科院分区：
文献类型：
--
作者：
Mitsuo;Y.;Tsunoda;H. and Yuma;M.
了解溪流鱼类的运动机制是与各种生态过程有关的一个基本问题。我们研究了一种小型底栖生物的运动模式，在小型源头溪流中使用了标记-再捕获技术。我们的主要目标如下：(I)评估棘球线虫的移动范围和方向；(Ii)研究生物和非生物因素如何影响迁出和迁徙模式；以及(Iii)评估溪流尺度上的移动模式。75%的回捕个体在放生后12个月内移动了100米，最大移动距离为上游500米。根据广义线性混合模型GLMM分析的结果，成虫的移动主要与同种密度有关，而与生境质量和个体大小无关。成虫在密度较高的区域主要是静止的，随着密度的降低，迁出量有增加的趋势。此外，流动个体倾向于进入相对高密度的区域，在河流尺度上，流动鱼类的比例与集水区面积呈显著正相关。这一结果表明，溪流流量会影响棘尾藻成虫的迁移率。在基流期间，许多河段的水是静止的，这表明集水区对水流的影响可能更多地是淡水的函数，而不是正常的水流。
Understanding the mechanism governing the movements of stream‐dwelling fish is a fundamental issue associated with a diverse range of ecological processes. We examined the movement pattern of a small benthic species,Lefua echigonia, using a mark–recapture technique in small headwater streams. Our main objectives were as follows: (i) to assess the movement range and direction ofL.echigonia; (ii) to examine how biotic and abiotic factors affect emigration and immigration patterns and (iii) to assess movement patterns at the stream scale.Stationary fish accounted for the greatest proportion of recaptured adultL.echigonia. Seventy‐five per cent of recaptured individuals moved <100 m in 12 months after release, and the maximum movement distance was 500 m upstream. Moreover, adultL.echigoniashowed significant upstream bias in movements.According to the results of the generalised linear mixed model GLMM analysis, movement of adultL.echigoniawas associated mainly with the density of conspecifics, rather than with habitat quality and body size. AdultL. echigoniawere mainly stationary in relatively high‐density sections, and emigration tended to increase with decreasing density. Moreover, mobile individuals were prone to move into relatively high‐density sections.The proportion of mobile fish showed a strong positive correlation with catchment area at the stream scale. This result indicates that stream discharge can influence the mobility of adultL.echigonia. During baseflow, the water was static in a number of stream sections, which suggests that the influence of catchment area on mobility may be more a function of freshets than normal water flow.