Diel horizontal migration in streams: Juvenile fish exploit spatial heterogeneity in thermal and trophic resources
Diel horizontal migration in streams: Juvenile fish exploit spatial heterogeneity in thermal and trophic resources
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DOI：
10.1890/12-1200.1
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发表时间：
2013-09-01
期刊：
影响因子：
4.8
通讯作者：
Torgersen, Christian E.
中科院分区：
文献类型：
--
作者：
Armstrong, Jonathan B.;Schindler, Daniel E.;Torgersen, Christian E.
湖泊和海洋物理特性的垂直异质性在生态学上是显著的，并通过昼夜垂直迁移被广泛的分类群利用，以促进其生长和生存。类似行为是否利用溪流中水平栖息地的异质性在很大程度上尚不清楚。我们研究了鱼类的运动行为，在日常的时间尺度，以探讨个人如何整合在食物丰富度和水温的空间变化。幼银鲑觅食突袭到寒冷的栖息地与丰富的食物，然后移动长距离（350-1300米）到温暖的栖息地，加速他们的新陈代谢，提高他们的同化能力。这种行为的温度调节，使鱼类利用热异质性，以减轻营养和热资源之间的权衡。利用热异质性的鱼类比采取其他行为的个体生长得更快。我们的研究结果提供了经验支持的重要性，热多样性在lotic系统，并强调管理和恢复生态系统时，考虑动物行为和栖息地异质性之间的相互作用的重要性。
Vertical heterogeneity in the physical characteristics of lakes and oceans is ecologically salient and exploited by a wide range of taxa through diel vertical migration to enhance their growth and survival. Whether analogous behaviors exploit horizontal habitat heterogeneity in streams is largely unknown. We investigated fish movement behavior at daily timescales to explore how individuals integrated across spatial variation in food abundance and water temperature. Juvenile coho salmon made feeding forays into cold habitats with abundant food, and then moved long distances (350-1300 m) to warmer habitats that accelerated their metabolism and increased their assimilative capacity. This behavioral thermoregulation enabled fish to mitigate trade-offs between trophic and thermal resources by exploiting thermal heterogeneity. Fish that exploited thermal heterogeneity grew at substantially faster rates than did individuals that assumed other behaviors. Our results provide empirical support for the importance of thermal diversity in lotic systems, and emphasize the importance of considering interactions between animal behavior and habitat heterogeneity when managing and restoring ecosystems.