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- Title
Variability in migration timing of adult Pacific lamprey ( Lampetra tridentata) in the Columbia River, U.S.A.
- Authors
Keefer, Matthew L.; Moser, Mary L.; Boggs, Charles T.; Daigle, William R.; Peery, Christopher A.
- Abstract
We examined the effects of river environment on the timing of spawning migrations by anadromous Pacific lamprey, Lampetra tridentata, in the Columbia River (U.S.A.). In a 41-year time series of adult lamprey counts, migration timing was earliest in warm, low-discharge years and latest in cold, high-flow years. Threshold temperatures associated with run timing were similar throughout the dataset despite significant impoundment-related warming, suggesting that temperature-dependent migration cues have been temporally stable. Within each year, migration rates of PIT-tagged lampreys were positively correlated with temperature and negatively correlated with discharge through multiple river reaches, offering additional evidence for environmental control of upstream movement. Both visual count and PIT-tag data indicated that there may be population-based differences in migration timing within the aggregate Columbia River lamprey run. These life history and behavioral results have potentially far-reaching implications for management of lamprey species.
- Subjects
COLUMBIA River; BRITISH Columbia; WATER temperature; RIVERS; ENVIRONMENTAL engineering; AGNATHA; THERMAL pollution of rivers, lakes, etc.
- Publication
Environmental Biology of Fishes, 2009, Vol 85, Issue 3, p253
- ISSN
0378-1909
- Publication type
Article
- DOI
10.1007/s10641-009-9490-7