Trophic polymorphism amongst Arctic charr from Loch Rannoch, Scotland
This paper describes the results of a multivariate and univariate morphometric analysis of three groups of Arctic charr Salvelinus alpinus from Loch Rannoch, Perthshire, Scotland, distinguished a priori on the basis of coloration (bright v. cryptic) and site of capture (from two locations 12 km apar...
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crwiley:10.1111/j.1095-8649.1998.tb00970.x 2024-09-15T17:52:21+00:00 Trophic polymorphism amongst Arctic charr from Loch Rannoch, Scotland Adams, C. E. Fraser, D. Huntingford, F. A. Greer, R. B. Askew, C. M. Walker, A. F. 1998 http://dx.doi.org/10.1111/j.1095-8649.1998.tb00970.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1998.tb00970.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1998.tb00970.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 52, issue 6, page 1259-1271 ISSN 0022-1112 1095-8649 journal-article 1998 crwiley https://doi.org/10.1111/j.1095-8649.1998.tb00970.x 2024-08-06T04:19:27Z This paper describes the results of a multivariate and univariate morphometric analysis of three groups of Arctic charr Salvelinus alpinus from Loch Rannoch, Perthshire, Scotland, distinguished a priori on the basis of coloration (bright v. cryptic) and site of capture (from two locations 12 km apart). The analysis produced a clear and highly significant distinction, not only between brightly and cryptically coloured charr, but also between the two cryptically coloured groups, one of which was more robust in terms of several size‐independent head measurements. Stomach analysis showed that the brightly coloured charr fed entirely on zooplankton, the less robust, cryptically coloured fish, fed on benthic macroinvertebrates, whereas a significant proportion of the diet of the more robust cryptically‐coloured form consisted of other fish. Differences in length at age also distinguished the three forms, with the robust, piscivorous charr, which live longer and potentially reach a larger final size, attaining smaller sizes at a given age. These data clearly confirm the previous identification of a distinct planktivorous morph of Arctic charr in Loch Rannoch and extend the morph analysis by distinguishing two additional morphs, a benthivorous morph and a piscivorous morph that are morphologically and ecologically distinct. The results are discussed in the context of other systems in which sympatric morphs of Arctic charr have been described. Article in Journal/Newspaper Arctic charr Salvelinus alpinus Zooplankton Wiley Online Library Journal of Fish Biology 52 6 1259 1271 |
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crwiley |
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English |
description |
This paper describes the results of a multivariate and univariate morphometric analysis of three groups of Arctic charr Salvelinus alpinus from Loch Rannoch, Perthshire, Scotland, distinguished a priori on the basis of coloration (bright v. cryptic) and site of capture (from two locations 12 km apart). The analysis produced a clear and highly significant distinction, not only between brightly and cryptically coloured charr, but also between the two cryptically coloured groups, one of which was more robust in terms of several size‐independent head measurements. Stomach analysis showed that the brightly coloured charr fed entirely on zooplankton, the less robust, cryptically coloured fish, fed on benthic macroinvertebrates, whereas a significant proportion of the diet of the more robust cryptically‐coloured form consisted of other fish. Differences in length at age also distinguished the three forms, with the robust, piscivorous charr, which live longer and potentially reach a larger final size, attaining smaller sizes at a given age. These data clearly confirm the previous identification of a distinct planktivorous morph of Arctic charr in Loch Rannoch and extend the morph analysis by distinguishing two additional morphs, a benthivorous morph and a piscivorous morph that are morphologically and ecologically distinct. The results are discussed in the context of other systems in which sympatric morphs of Arctic charr have been described. |
format |
Article in Journal/Newspaper |
author |
Adams, C. E. Fraser, D. Huntingford, F. A. Greer, R. B. Askew, C. M. Walker, A. F. |
spellingShingle |
Adams, C. E. Fraser, D. Huntingford, F. A. Greer, R. B. Askew, C. M. Walker, A. F. Trophic polymorphism amongst Arctic charr from Loch Rannoch, Scotland |
author_facet |
Adams, C. E. Fraser, D. Huntingford, F. A. Greer, R. B. Askew, C. M. Walker, A. F. |
author_sort |
Adams, C. E. |
title |
Trophic polymorphism amongst Arctic charr from Loch Rannoch, Scotland |
title_short |
Trophic polymorphism amongst Arctic charr from Loch Rannoch, Scotland |
title_full |
Trophic polymorphism amongst Arctic charr from Loch Rannoch, Scotland |
title_fullStr |
Trophic polymorphism amongst Arctic charr from Loch Rannoch, Scotland |
title_full_unstemmed |
Trophic polymorphism amongst Arctic charr from Loch Rannoch, Scotland |
title_sort |
trophic polymorphism amongst arctic charr from loch rannoch, scotland |
publisher |
Wiley |
publishDate |
1998 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1998.tb00970.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1998.tb00970.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1998.tb00970.x |
genre |
Arctic charr Salvelinus alpinus Zooplankton |
genre_facet |
Arctic charr Salvelinus alpinus Zooplankton |
op_source |
Journal of Fish Biology volume 52, issue 6, page 1259-1271 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1998.tb00970.x |
container_title |
Journal of Fish Biology |
container_volume |
52 |
container_issue |
6 |
container_start_page |
1259 |
op_container_end_page |
1271 |
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1810294393798656000 |