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- Title
Contrasting patterns of territoriality and foraging mode in two stream-dwelling salmonids, Arctic char ( Salvelinus alpinus) and brown trout ( Salmo trutta).
- Authors
Gunnarsson, Guðmundur Smári; Steingrímsson, Stefán Óli; Tonn, William
- Abstract
Territoriality and foraging behaviour play major roles in determining the abundance and distribution of mobile animals. To date, territorial behaviour of young-of-the-year (YOY) salmonids is typically described for sit-and-wait individuals that defend territories from one foraging station, but rarely for more mobile fish. We examined the territorial behaviour and foraging mode of 31 YOY Arctic char () and 30 YOY brown trout () in relation to ecological factors in six rivers in northern Iceland. Arctic char used larger territories than brown trout, corresponding with high and low mobility prior to attacking prey, respectively. Within species, more mobile fish also used larger territories. Territory size increased with body size and declined with increased food abundance as predicted, but surprisingly increased with rising intruder pressure. Finally, Arctic char territories overlapped more and were less exclusively defended than brown trout territories. This study shows that territories of mobile individuals may not always pertain to the same rules as single central-place territories and highlights that territorial behaviour, and its role in population regulation, may vary between salmonid species.
- Subjects
FORAGING behavior; TERRITORIAL behavior in fishes; SALMONIDAE; STENODUS; BROWN trout; ARCTIC char; REPRODUCTION
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2011, Vol 68, Issue 12, p2090
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/f2011-127