Stream Gradient-Related Movement and Growth of Atlantic Salmon Parr during Winter
| Autor: | Morten Stickler, Knut Alfredsen, D. A. Scruton, David Cote, Eva C. Enders, C. J. Pennell |
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| Rok vydání: | 2008 |
| Předmět: |
Mobile tracking
geography geography.geographical_feature_category biology Cold season Stream gradient Late winter Anchor ice Aquatic Science biology.organism_classification Fishery Oceanography Spring (hydrology) Environmental science Lack of knowledge Salmo Ecology Evolution Behavior and Systematics |
| Zdroj: | Transactions of the American Fisheries Society. 137:371-385 |
| ISSN: | 1548-8659 0002-8487 |
| DOI: | 10.1577/t06-265.1 |
| Popis: | There has been considerable focus on winter studies of Atlantic salmon Salmo salar parr during the last two decades. However, a lack of knowledge exists about the linkage between the physical conditions, including ice, and parr behavior in flow environments during the cold season. In this study, the movement and growth of Atlantic salmon parr were studied during winter in two stream sections with different gradients (0.3% and 1.8%) in a small natural river. Passive integrated transponder (PIT) technology was implemented by using both fixed antennae and mobile tracking devices. In the low-gradient section, the formation of surface ice dominated and created stable conditions, whereas in the high-gradient section, the formation of anchor ice and anchor ice dams occurred periodically and produced a dynamic environment. The results indicated a relationship between parr movement and river gradient. Movement by parr was negatively correlated with time from autumn to late winter but increased as spring a... |
| Databáze: | OpenAIRE |
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