Summer Movements of Juvenile Coho Salmon under Variable Stream Flow Conditions
| Autor: | Ryan Franckowiak, Matthew David Allen, David George Lonzarich |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
geography
geography.geographical_feature_category biology Flood myth Ecology business.industry Flooding (psychology) Aquatic Science Snorkeling biology.organism_classification Fishery Habitat Abundance (ecology) Tributary Oncorhynchus Environmental science Juvenile business Ecology Evolution Behavior and Systematics |
| Zdroj: | Transactions of the American Fisheries Society. 138:397-406 |
| ISSN: | 1548-8659 0002-8487 |
| DOI: | 10.1577/t07-282.1 |
| Popis: | We describe the distribution of juvenile (age-0) coho salmon Oncorhynchus kisutch and the effects of summer flooding on their movements in a small Lake Superior tributary. We documented large fluctuations in fish abundance over a 60-d survey period by conducting repeated snorkeling surveys within 16 reaches and 82 individual habitat units in a 2-km segment of the Onion River, Wisconsin. Fish densities in reaches were more stable than those within individual habitat units. Moreover, temporal trends in fish abundance were correlated strongly with the physical features of reaches but not with those of individual habitat units. In focusing on fine-scale changes in fish distribution, we uncovered three general patterns of movement within this stream. The first was associated with flood events, which caused the downstream displacement of large numbers of fish (up to 80% loss from individual pools). The second was the upstream recolonization of fish into depleted pools during the intervening periods of ... |
| Databáze: | OpenAIRE |
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