Double‐crested cormorant Phalacrocorox auritus Lesson (cormorant) populations have increased throughout the Great Lakes region of North America causing concern related to the impact of cormorant predation on fish communities. A recent decline in yellow perch Perca flavescens (Mitchill) abundance within the Lake Winnebago System, Wisconsin, USA, prompted an assessment of cormorant diets to evaluate potential effects of cormorant predation on the sportfish community. Diets were collected from 883 cormorants (417 from Lake Winnebago and 466 from Lake Butte des Morts) between 2015 and 2017. Cormorant diets on both waterbodies consisted mostly of freshwater drum Aplodinotus grunniens Rafinesque and gizzard shad Dorosoma cepedianum (Lesueur). Yellow perch and walleye Sander vitreus (Mitchill) observations were infrequent and represented < 5% of cormorant diets by weight each year. Under current conditions, cormorant predation likely has minimal impact on the Lake Winnebago sportfish community, but more research is needed to assess potential impacts on Lake Butte des Morts.

中文翻译：

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威斯康星州Winnebago湖系统中双冠mor的饮食

在北美大湖地区，双cor的Ph（ Lesson）种群增加了，引起了人们对pre捕食对鱼类群落的影响的担忧。美国威斯康星州Winnebago湖系统中的黄色鲈鱼Perca flavescens（Mitchill）数量最近减少，促使人们对cor饮食进行了评估，以评估cor捕食对sport鱼群落的潜在影响。在2015年至2017年之间，从883 mor（来自温尼巴​​戈湖的417和来自特莫特湖的466）收集了饮食。两个水体上的diet饮食主要包括淡水鼓g草（Aplodinotus grunniens Rafinesque）和g（Gizzard shad）Do（Dorosoma cepedianum）（律师）。黄鲈和大眼桑德玻璃体（Mitchill）的观察很少见，每年占<饮食的<5％。在当前条件下，cor捕食对温尼巴哥湖运动鱼群落的影响可能很小，但是需要更多的研究来评估对莫特湖的潜在影响。