Changes in Diet and Body Condition of Lake Whitefish in Southern Lake Michigan Associated with Changes in Benthos

Autor:	Stephen B. Brandt, Philip J. Schneeberger, Thomas F. Nalepa, Steven A. Pothoven
Rok vydání:	2001
Předmět:	Coregonus clupeaformis Ecology biology Management Monitoring Policy and Law Aquatic Science biology.organism_classification Dreissena Fishery Benthos Benthic zone Biological attributes Deepwater sculpin Ecology Evolution Behavior and Systematics Body condition
Zdroj:	North American Journal of Fisheries Management. 21:876-883
ISSN:	1548-8675 0275-5947
DOI:	10.1577/1548-8675(2001)021<0876:cidabc>2.0.co;2
Popis:	We evaluated the long-term trends of the benthic macroinvertebrate community (1980–1999) and biological attributes of lake whitefish Coregonus clupeaformis (1985–1999) in southeastern Lake Michigan. We also determined what food types were important to lake whitefish in an area where the amphipod Diporeia had not yet declined in 1998 and how the diet of lake whitefish changed as Diporeia declined during 1999–2000. Zebra mussels Dreissena polymorpha invaded the study area in 1992; Diporeia began to decline in 1993 and was nearly absent by 1999. The body condition of lake whitefish decreased after 1993 and remained low thereafter. The length at age and weight at age of lake whitefish was lower in 1992–1999 than in 1985–1991. After declines of Diporeia off the city of Muskegon, Michigan, between 1998 and 1999–2000, the proportion of Diporeia in the diet by weight fell from 70% to 25% and the percent occurrence decreased from 81% to 45%. In contrast, the proportion of lake whitefish that ate other pre...
Databáze:	OpenAIRE
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