首页   按字顺浏览 期刊浏览 卷期浏览 Effects of Walleye Predation on the Population Dynamics of Small Littoral-Zone Fishes i...
Effects of Walleye Predation on the Population Dynamics of Small Littoral-Zone Fishes in a Northern Wisconsin Lake

 

作者: John Lyons,   JohnJ. Magnuson,  

 

期刊: Transactions of the American Fisheries Society  (Taylor Available online 1987)
卷期: Volume 116, issue 1  

页码: 29-39

 

ISSN:0002-8487

 

年代: 1987

 

DOI:10.1577/1548-8659(1987)116<29:EOWPOT>2.0.CO;2

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

We used a bioenergetics model to assess the effects of predation by juvenile walleyesStizostedion vitreum vitreumon the populations of darters (Percidae) and minnows (Cyprinidae) in Sparkling Lake, Wisconsin. In 1982, when young-of-the-year yellow perchPerca flavescenswere scarce, darters and minnows were important in walleye diets throughout the summer. Walleye predation accounted for approximately 100% of adult darter mortality and 75% of adult minnow mortality. Walleyes appeared to be important in determining abundance of young-of-the-year darters in October, but had little direct effect on abundance of young-of-the-year minnows. In 1983, when young-of-the-year yellow perch were abundant, darters and minnows were only important in walleye diets in June. Walleye predation accounted for 80% of adult darter mortality but only 35% of adult minnow mortality. The decrease in walleye consumption of adult darters and minnows in 1983 compared with 1982 is consistent with the hypothesis that abundant yellow perch year classes buffer littoral-zone fish assemblages from walleye predation. The decrease in walleye predation on darters that occurred with increased abundance of young-of-the-year yellow perch appeared to allow an increase in abundance of young-of-the-year darters. However, for minnows, the decrease in walleye predation did not decrease adult total mortality nor did it lead to an increased young-of-the-year abundance. This implies that walleye predation has a much greater direct impact on the darter population than on the minnow population.

 

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