Phenotypic and resource use partitioning amongst sympatric, lacustrine brown trout, Salmo trutta

Piggott, C. V.H., Verspoor, E., Greer, R., Hooker, O., Newton, J. and Adams, C. E. (2018) Phenotypic and resource use partitioning amongst sympatric, lacustrine brown trout, Salmo trutta. Biological Journal of the Linnean Society, 124(2), pp. 200-212. (doi:10.1093/biolinnean/bly032)

Piggott, C. V.H., Verspoor, E., Greer, R., Hooker, O., Newton, J. and Adams, C. E. (2018) Phenotypic and resource use partitioning amongst sympatric, lacustrine brown trout, Salmo trutta. Biological Journal of the Linnean Society, 124(2), pp. 200-212. (doi:10.1093/biolinnean/bly032)

Full text not currently available from Enlighten.

Abstract

Divergence into discrete foraging specialist morphs living in sympatry is relatively well described in lacustrine fishes of the Salmonidae. Although piscivorous forms of Salmo trutta have been widely reported, other trophic foraging specialists are strangely rarely recorded amongst Salmo species. Microsatellite and mitochondrial genetic data segregated S. trutta collected from Loch Laidon, Scotland, into four distinct genetic groups. Three groups analysed in this study showed significant differences in body shape, stomach contents, muscle stable isotope signature, gill raker length and spacing, and habitat use. We conclude that the three genetically defined groups comprise: a generalist foraging morph, a pelagic feeding specialist morph and a profundal macrobenthos feeding morph. The features distinguishing these morphs, however, show a degree of overlap. This appears to be only the second record of invertebrate resource use partitioning associated with expression of alternative morphologies in sympatry this species and the first report of a profundal invertebrate feeding morph. Why such polymorphisms are generally rare in Salmo species remains unclear, but potential explanations are discussed.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Newton, Dr Jason and Adams, Professor Colin
Authors: Piggott, C. V.H., Verspoor, E., Greer, R., Hooker, O., Newton, J., and Adams, C. E.
College/School:College of Medical Veterinary and Life Sciences > Institute of Biodiversity Animal Health and Comparative Medicine
College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Biological Journal of the Linnean Society
Publisher:Oxford University Press
ISSN:0024-4066
ISSN (Online):1095-8312
Published Online:19 April 2018

University Staff: Request a correction | Enlighten Editors: Update this record