The collapse of Diporeia spp. and invasions of dreissenid mussels (zebra, Dreissena polymorpha; quagga, D. bugensis) and round goby (Neogobius melanostomus) have been associated with declines in abundance of native benthic fishes in the Great Lakes, including historically abundant slimy sculpin (Cottus cognatus). We hypothesized that as round goby colonized deeper habitat, slimy sculpin avoided habitat competition, predation, and aggression from round goby by shifting to deeper habitat. Accordingly, we predicted increased depth overlap of slimy sculpin with both round goby and deepwater sculpin (Myoxocephalus thompsonii) that resulted in habitat squeeze by both species. We used long-term bottom trawl data from Lakes Michigan, Huron, and Ontario to evaluate shifts in slimy sculpin depth and their depth overlap with round goby and deepwater sculpin. Lake Huron most supported our hypotheses as slimy sculpin shifted to deeper habitat coincident with the round goby invasion, and depth overlap between slimy sculpin and both species recently increased. Slimy sculpin depth trends in Lakes Michigan and Ontario suggest other ecological and environmental factors better predicted sculpin depth in these lakes.

Diporeia spp.的崩溃。德莱森贻贝（斑马，Dreissena polymorpha；quagga，D. bugensis）和圆虾虎鱼（Negobius melanostomus）的入侵与五大湖中原生底栖鱼类的数量下降有关，其中包括历史上丰富的粘液杜鹃（Cottus cognatus）。我们假设，随着圆形虾虎鱼在更深的栖息地定居，黏糊糊的杜松鱼通过转移到更深的栖息地来避免圆形虾虎鱼的栖息地竞争、捕食和侵略。因此，我们预测粘稠杜鹃与圆形虾虎鱼和深水杜鹃（Myoxocephalus thompsonii）的深度重叠增加）导致两个物种的栖息地挤压。我们使用来自密歇根湖、休伦湖和安大略湖的长期底拖网数据来评估粘糊糊的杜松鱼深度的变化以及它们与圆形虾虎鱼和深水杜松鱼的深度重叠。休伦湖最支持我们的假设，因为与圆形虾虎鱼入侵相吻合，黏糊糊的杜松鱼转移到更深的栖息地，而且最近黏糊糊的杜松鱼和这两个物种之间的深度重叠有所增加。密歇根湖和安大略湖粘稠的杜鹃花深度趋势表明，其他生态和环境因素可以更好地预测这些湖泊中的杜鹃花深度。