Burst and coast use, swimming performance and metabolism of Atlantic cod Gadus morhua in sub-lethal hypoxic conditions
| Autor: | J. D. Dutil, Eve-Lyne Sylvestre, R. Larocque, L. Gamache, Helga Guderley |
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| Rok vydání: | 2007 |
| Předmět: |
geography
geography.geographical_feature_category biology Low oxygen chemistry.chemical_element Hypoxia (environmental) Estuary Metabolism Aquatic Science biology.organism_classification Oxygen Rate of increase Fishery Animal science chemistry Gadus Atlantic cod Ecology Evolution Behavior and Systematics |
| Zdroj: | Journal of Fish Biology. 71:363-375 |
| ISSN: | 1095-8649 0022-1112 |
| DOI: | 10.1111/j.1095-8649.2007.01487.x |
| Popis: | Prolonged swimming capacity (critical swimming speed, Ucrit, protocol) and metabolism were measured for 14 Atlantic cod Gadus morhua exposed to seven oxygen levels within the non-lethal range normally encountered in the Gulf of St Lawrence (35 to 100% saturation). Burst-and-coast swimming was triggered earlier (at lower speeds) in hypoxia, and burst-and-coast movements were more frequent in hypoxia than in normoxia at low speeds. Furthermore, the metabolic scope beyond the metabolic rate at which Atlantic cod resorted to burst-and-coast movements decreased gradually as ambient oxygen concentration dropped. Overall, fewer burst-and-coast movements were observed in hypoxia while the distance swum in burst-and-coast mode remained c. 1% of the total distance swam in all tests. Oxygen availability had no effect on the rate of increase in metabolic rate with increasing velocity |
| Databáze: | OpenAIRE |
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