Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs

Simonsen, M. K., Siwertsson, A., Adams, C. E. , Amundsen, P.-A., Praebel, K. and Knudsen, R. (2017) Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs. Ecology and Evolution, 7(18), pp. 7277-7289. (doi: 10.1002/ece3.3224)

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A study of body and head development in three sympatric reproductively isolated Arctic charr (Salvelinus alpinus (L.)) morphs from a subarctic lake (Skogsfjordvatn, northern Norway) revealed allometric trajectories that resulted in morphological differences. The three morphs were ecologically assigned to a littoral omnivore, a profundal benthivore and a profundal piscivore, and this was confirmed by genetic analyses (microsatellites). Principal component analysis was used to identify the variables responsible for most of the morphological variation of the body and head shape. The littoral omnivore and the profundal piscivore morph had convergent allometric trajectories for the most important head shape variables, developing bigger mouths and relatively smaller eyes with increasing head size. The two profundal morphs shared common trajectories for the variables explaining most of the body and head shape variation, namely head size relative to body size, placement of the dorsal and pelvic fins, eye size and mouth size. In contrast, the littoral omnivore and the profundal benthivore morphs were not on common allometric trajectories for any of the examined variables. The findings suggest that different selective pressures could have been working on traits related to their trophic niche such as habitat and diet utilization of the three morphs, with the two profundal morphs experiencing almost identical environmental conditions.

Item Type:Articles
Keywords:Ecology, evolution, behavior and systematics, nature and landscape conservation.
Glasgow Author(s) Enlighten ID:Adams, Professor Colin
Authors: Simonsen, M. K., Siwertsson, A., Adams, C. E., Amundsen, P.-A., Praebel, K., and Knudsen, R.
College/School:College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
Journal Name:Ecology and Evolution
ISSN (Online):2045-7758
Published Online:08 August 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Ecology and Evolution 7(18):7277-7289
Publisher Policy:Reproduced under a Creative Commons License

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