Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs
Abstract 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 ecological...
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doaj-34430c097017478ca383581efb6cd7c92021-03-02T08:09:23ZengWileyEcology and Evolution2045-77582017-09-017187277728910.1002/ece3.3224Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphsMarianne Knutsdotter Simonsen0Anna Siwertsson1Colin Ean Adams2Per‐Arne Amundsen3Kim Præbel4Rune Knudsen5Department of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Tromsø NorwayDepartment of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Tromsø NorwayScottish Centre for Ecology and the Natural Environment IBAHCM, University of Glasgow Glasgow UKDepartment of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Tromsø NorwayFaculty of Biosciences, Fisheries and Economics The Norwegian College of Fishery Science UiT The Arctic University of Norway Tromsø NorwayDepartment of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Tromsø NorwayAbstract 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.https://doi.org/10.1002/ece3.3224niche segregationphenotypic diversitypolymorphismsalmonids |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Marianne Knutsdotter Simonsen Anna Siwertsson Colin Ean Adams Per‐Arne Amundsen Kim Præbel Rune Knudsen |
spellingShingle |
Marianne Knutsdotter Simonsen Anna Siwertsson Colin Ean Adams Per‐Arne Amundsen Kim Præbel Rune Knudsen Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs Ecology and Evolution niche segregation phenotypic diversity polymorphism salmonids |
author_facet |
Marianne Knutsdotter Simonsen Anna Siwertsson Colin Ean Adams Per‐Arne Amundsen Kim Præbel Rune Knudsen |
author_sort |
Marianne Knutsdotter Simonsen |
title |
Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs |
title_short |
Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs |
title_full |
Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs |
title_fullStr |
Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs |
title_full_unstemmed |
Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs |
title_sort |
allometric trajectories of body and head morphology in three sympatric arctic charr (salvelinus alpinus (l.)) morphs |
publisher |
Wiley |
series |
Ecology and Evolution |
issn |
2045-7758 |
publishDate |
2017-09-01 |
description |
Abstract 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. |
topic |
niche segregation phenotypic diversity polymorphism salmonids |
url |
https://doi.org/10.1002/ece3.3224 |
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