Aggressive interactions affect foraging and use of space in a drift foraging salmonid, Salvelinus malma (Salmoniformes: Salmonidae)

Author:

Cullen Jeffrey L1,Grossman Gary D1ORCID

Affiliation:

1. Warnell School of Forestry & Natural Resources, University of Georgia, Athens, GA, USA

Abstract

Abstract Although intraspecific interactions likely affect habitat choice and foraging behaviour in animals, our knowledge regarding how these factors interact is frequently limited to either lab or field studies, but not both. We observed pairs of dominant and subordinate drift-foraging Dolly Varden char (Salvelinus malma) in an Alaskan stream, and quantified intraspecific interactions and foraging behaviour. Dominant individuals had higher foraging rates, occupied slower holding velocities and were displaced shorter distances during bouts compared to subordinate individuals. Individuals initiated bouts more frequently from the downstream position, than from lateral or upstream positions. Dominant individuals were more likely to occupy the upstream position after a bout than subordinates, which ensures that dominants have the first opportunity to capture drifting prey.

Funder

The North Pacific Research Board

Publisher

Oxford University Press (OUP)

Subject

Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics

Reference44 articles.

1. The dolly varden.;Armstrong,1980

2. The puzzling paucity of feeding territories among freshwater fishes;Barlow;Marine and Freshwater Behaviour and Physiology,1993

3. Contest behaviour.;Briffa,2010

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