Effective fishery management necessitates understanding of resource partitioning by fishes that inhabit complex systems composed of biotic and abiotic features. Evaluations of non-native species introductions have continually demonstrated adverse effects associated with abundance and distribution of native fishes. Therefore, understanding resource selection and interactions between native and non-native species is important for recovery efforts. Habitat use by two native fish species (largescale sucker Catostomus macrocheilus [Girard] and mountain whitefish Prosopium williamsoni [Girard]) and one non-native fish species (pumpkinseed Lepomis gibbosus [Linnaeus]) of the Kootenai River, Idaho, were evaluated in a laboratory stream system. Trials were conducted in allopatry and in sympatry with and without the presence of wood to describe habitat selection in the context of on-going habitat rehabilitation efforts. Interactions were evident between native largescale sucker and non-native pumpkinseed concerning use of a woody structure and current velocity. Mountain whitefish used low-velocity habitats and selected locations that were further from wood when in sympatry with pumpkinseed. Our research suggests that habitat use of native, large-river fishes may be influenced by the presence of a non-native species, and that considering such interactions is critical when designing and implementing habitat rehabilitation efforts in river ecosystems.

中文翻译：

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模拟河流系统中本地和非本地鱼类的资源选择和物种相互作用

有效的渔业管理需要了解栖息在由生物和非生物特征组成的复杂系统中的鱼类的资源分配。对非本地物种引入的评估不断证明与本地鱼类的丰度和分布相关的不利影响。因此，了解本地和非本地物种之间的资源选择和相互作用对于恢复工作很重要。两种本地鱼类（大型吸盘Catostomus macrocheilus [Girard] 和山白鱼Prosopium williamsoni [Girard]）和一种非本地鱼类（南瓜籽Lepomis gibbosus ）的栖息地使用爱达荷州库特奈河的 [Linnaeus]) 在实验室河流系统中进行了评估。试验是在异源地和在有和没有木材的情况下进行的，以描述在正在进行的栖息地恢复工作的背景下的栖息地选择。原生大型吸盘和非原生南瓜籽之间在木质结构和水流速度方面的相互作用很明显。山白鲑使用低速栖息地，并在与南瓜籽同种时选择远离木材的位置。我们的研究表明，本地大型河流鱼类的栖息地使用可能会受到非本地物种存在的影响，并且在设计和实施河流生态系统的栖息地恢复工作时考虑这种相互作用至关重要。