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- Title
Temperature, salinity and prey availability shape the marine migration of Arctic char, Salvelinus alpinus, in a macrotidal estuary.
- Authors
Spares, Aaron; Stokesbury, Michael; O'Dor, Ron; Dick, Terry
- Abstract
The influence of salinity, temperature and prey availability on the marine migration of anadromous fishes was determined by describing the movements, habitat use and feeding behaviours of Arctic char ( Salvelinus alpinus). The objectives were to determine whether char are restricted to the upper water column of the inter-/subtidal zones due to warmer temperatures. Twenty-seven char were tracked with acoustic temperature/pressure (depth) transmitters from June to September, 2008/2009, in inner Frobisher Bay, Canada. Most detections were in surface waters (0-3 m). Inter-/subtidal movements and consecutive repetitive dives (maximum 52.8 m) resulted in extreme body temperature shifts (−0.2-18.1 °C). Approximately half of intertidal and subtidal detections were between 9-13 °C and 1-3 °C, respectively. Stomach contents and deep diving suggested feeding in both inter-/subtidal zones. We suggest that char tolerate cold water at depth to capture prey in the subtidal zone, then seek warmer water to enhance feeding/digestion physiology.
- Subjects
ARCTIC char; FISH migration; SALINITY; PREY availability; WATER temperature; ESTUARINE animals; ANIMAL behavior
- Publication
Marine Biology, 2012, Vol 159, Issue 8, p1633
- ISSN
0025-3162
- Publication type
Article
- DOI
10.1007/s00227-012-1949-y