Haywood, Carl N. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume 75 (1987)
Rudsam, Lars G.; Trapp, Todd W.
Diel patterns of behavior and habitat utilization of cisco (Coregonus artedii) in two Wisconsin lakes, pp. 70-78 PDF (3.4 MB)
Diel Patterns of Behavior and Habitat Utilization of Cisco (Coregonus artedii) in Two Wisconsin Lakes Lars G. Rudstam and Todd W. Trapp Abstract. Diel patterns of behavior and habitat utilization of cisco (Comegonus antedii) differed between lakes and among age groups. At night, cisco were dispersed across both lakes, but three different daytime distributions were observed: cisco were (1) dispersed and distributed across the lake (older fish in Trout Lake), (2) schooled and distributed across the lake (Pallette Lake), and (3) schooled and distributed closer to shore (younger fish in Trout Lake). No die! vertical migration was observed, but the smaller fish in Trout Lake moved toward the shore during dawn and offshore during dusk. Stomach analyses indicate that cisco may feed both day and night. Younger cisco were spatially segregated from older fish in Trout Lake, but there were only small differences in diet between the two groups. Possible causes for differences between lakes and between age groups are discussed. pelagic fishes in lakes often exhibit did 1979, Hanych et al. 1983, Brabrand et al. patterns of behavior and habitat 1984), and centmamchids (Baumann and utilization. Vertical migrations toward the Kitchell 1974). surface at night are common in plank- Engel and Magnuson attributed the tivonous salmonines (Nanver 1970, Eggens lack of vertical migration of cisco in 1978) and conegonines (Nomthcote and Pallette Lake to the narrow depth interval Rundberg 1970, Dembinski 1971, Nilsson where temperatures were low and oxygen 1979, Endemlein 1982, Hamnin 1986). levels high enough to support cisco (the However, Engel and Magnuson (1976) did "cisco layer" of Frey 1955). Vertical not observe any vertical migration of migrations would then be expected in cisco (Coregonus artedii) in Pallette Lake, larger, deepen lakes with well-oxygenated Wisconsin, during summer stratification. hypolimnia. In this paper, we present Instead, they reported a horizontal did results from an investigation of cisco did migration. The fish moved onshore at behavior in two northern Wisconsin lakes dawn and offshore at dusk. Horizontal (Trout and Pallette Lakes) during summer did migrations of comegonines have not stratification, using sonar and vertical gill been reported elsewhere, but such migma- nets. We address the following questions: tions have been observed for pencids (1) is the horizontal did migration pattern (Haslen and Bandach 1949, Haslen and reported from Pallette Lake consistent Villemonte 1953), cypninids (Hall et al. oven a period of time, (2) can this pattern be found in another lake, and (3) does Lars G. Rudstarn is a Ph.D. candidate in Marine vertical did migration occur when the Biology at the University of Stockholm. , , - hypolimmon is deep and well oxygenated Todd W. Trapp is an undergraduate student at the University of Wisconsin-Madison majoring in (Trout Lake, temperatures below 10 C zoology, and oxygen levels above 3 mg/l from 12- 70
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