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Prey trait analysis shows differences in summer feeding habitat use between wild YOY Atlantic salmon and brown trout

Abstract We evaluated the vertical use of the water column for feeding by young of the year (YOY) of brown trout (Salmo trutta) and Atlantic salmon (S. salar) in a natural river during the summer. Prey trait analysis and diet composition demonstrated that brown trout showed a higher ability to feed on prey in the surface of the water column than Atlantic salmon. Hence, the differences in the ability to feed at different depths of the water column (surface vs. bottom) are important adaptive features that may reduce interspecific competition between the two sympatric fish species. Finally, results derived from the prey trait analysis provide useful information on resource partitioning between sympatric salmonid species.