Journal
HYDROBIOLOGIA
Volume 644, Issue 1, Pages 385-399Publisher
SPRINGER
DOI: 10.1007/s10750-010-0207-x
Keywords
Blackchin shiner; Blacknose shiner; Banded killifish; Home range; Habitat use; Macrophytes
Categories
Funding
- Minnesota Department of Natural Resources Fish and Game Fund
- Mississippi State University Department of Wildlife and Fisheries
- Forest and Wildlife Research Center
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We explored patterns of habitat use and movement of three declining fish species intolerant to eutrophication in a north-temperate (Minnesota, USA) glacial lake: the blackchin shiner Notropis heterodon, blacknose shiner Notropis heterolepis, and banded killifish Fundulus diaphanus. We marked individuals with elastomer tags and estimated movement distances of recaptured individuals. Estimated home ranges for all species ranged from 3,264 to 19,525 m(2), which covered 0.8 and 5.0% of our study lake's total littoral area. Individuals of all species traveled to opposite ends of the lake over periods of time as short as 24 h. Using Geographic Information System (GIS) overlays and generalized additive models, we found fish species occurrences to be positively associated with macrophyte biovolume greater than 20% and with a high probability of occurrence of Chara. The magnitude of main and interaction effects varied among years and species. Overall, blackchin shiner occurrence was most strongly associated with biovolume. In other species by year combinations, biovolume and Chara explained varying degrees of variance in fish probability of occurrence. Our results suggest that controlling lake eutrophication and protecting of refuge areas of dense macrophytes and Chara may be needed to conserve these species.
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