Effects of River Discharge, Temperature, and Future Climates on Energetics and Mortality of Adult Migrating Fraser River Sockeye Salmon
| Autor: | J. Morrison, M. J. MacNutt, Michael C. Healey, M. G. G. Foreman, Scott G. Hinch, Anthony P. Farrell, Peter S. Rand, J. S. Macdonald, David A. Higgs |
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| Rok vydání: | 2006 |
| Předmět: |
education.field_of_study
geography geography.geographical_feature_category biology Discharge Population Global warming Energetics Estuary Aquatic Science biology.organism_classification Fishery Water temperature Oncorhynchus Environmental science Fish education Ecology Evolution Behavior and Systematics |
| Zdroj: | Transactions of the American Fisheries Society. 135:655-667 |
| ISSN: | 1548-8659 0002-8487 |
| DOI: | 10.1577/t05-023.1 |
| Popis: | We evaluated the effects of past and future trends in temperature and discharge in the Fraser River on the migratory performance of the early Stuart population of sockeye salmon Oncorhynchus nerka. Fish of lower condition exhibited disproportionately higher mortality during the spawning run, elucidating a critical link between energetic condition and a fish's ability to reach the spawning grounds. We simulated spawning migrations by accounting for energetic demands for an average individual in the population from the time of entry into the Fraser River estuary to arrival on the spawning grounds (about 1,200 km upstream) and estimated energy expenditures for the average migrant during 1950–2001. The model output indicates relatively high interannual variability in migration energy use and a marked increase in energy demands in recent years related to unusually high discharges (e.g., 1997) and warmer than average water temperature (e.g., 1998). We examined how global climate change might effect dis... |
| Databáze: | OpenAIRE |
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