Residency and movement patterns of Arctic charr Salvelinus alpinus relative to major estuaries.

摘要: Estuarine residency and marine movements of 43 anadromous Arctic charr Salvelinus alpinus (mean ± s.d. fork length = 523 97 mm) were examined using acoustic tracking in inner Frobisher Bay (IFB; 63° N; 68° W), Canada, from July to September 2008 2009. A mean migration duration 63 7 days occurred late June early September. Detected S. either continuously (maximum 34 days) or intermittently present estuarine zones, on average residing approximately one third time tracked returning once every 9 days. Significantly higher during the final 15 suggested that a transition phase may occur prior freshwater re-entry. Low travel rates flood tide individuals staged before accessing intertidal zones. Although two main estuaries c. 22 km apart, 19% tagged used both. Individuals remained relatively close overwintering systems, although late-migration inter-estuarine have indicated natal homing. Approximately half exhibited extra-estuarine travel, mostly mid-migration, but within 3 shore ranging < 30 straight line distance (SLD) estuary. It was concluded IFB (1) spent significant portion their adjacent (2) had restricted distribution SLD river mouths.