Incipient speciation through niche expansion: an example from the Arctic charr in a subarctic lake
Two reproductive isolated morphs of Arctic charr ( Salvelinus alpinus ), termed profundal and littoral charr according to their different spawning habitats, co-occur in the postglacial lake Fjellfrøsvatn in North Norway. All profundal charr live in deep water their entire life and have a maximum siz...
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crroyalsociety:10.1098/rspb.2006.3582 2024-06-02T08:00:05+00:00 Incipient speciation through niche expansion: an example from the Arctic charr in a subarctic lake Knudsen, Rune Klemetsen, Anders Amundsen, Per-Arne Hermansen, Bjørn 2006 http://dx.doi.org/10.1098/rspb.2006.3582 https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.2006.3582 https://royalsocietypublishing.org/doi/full-xml/10.1098/rspb.2006.3582 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Proceedings of the Royal Society B: Biological Sciences volume 273, issue 1599, page 2291-2298 ISSN 0962-8452 1471-2954 journal-article 2006 crroyalsociety https://doi.org/10.1098/rspb.2006.3582 2024-05-07T14:16:15Z Two reproductive isolated morphs of Arctic charr ( Salvelinus alpinus ), termed profundal and littoral charr according to their different spawning habitats, co-occur in the postglacial lake Fjellfrøsvatn in North Norway. All profundal charr live in deep water their entire life and have a maximum size of 14 cm, while the littoral charr grow to 40 cm. Some small and young littoral charr move to the profundal zone in an ontogenetic habitat shift in the ice-free season and the rest of the population remains in epilimnic waters. The two morphs had different diet niches in the profundal zone: the profundal charr ate typical soft-bottom prey (chironomid larvae, pea mussels and benthic copepods), while the young littoral charr mainly consumed crustacean zooplankton. In four other lakes without a profundal morph (i.e. monomorphic populations), young charr also performed ontogenetic habitat shifts to the profundal zone and fed on zooplankton. The profundal morph of Fjellfrøsvatn therefore utilize a food resource niche that neither the littoral morph nor comparable monomorphic populations exploit. This suggests that intraspecific resource competition has driven incipient ecological speciation of the profundal charr of Fjellfrøsvatn. The exploitation of the soft-bottom resources by the profundal charr supports earlier experimental findings that the profundal morph is genetically different in trophic behaviour and morphology. The sympatric ecological divergence within the profundal habitat is possible because unexploited food resources (soft-bottom profundal prey) are available. Apparently, this represents a case of incipient segregation by expansion to new resource types (niche invasion), and not by subdivision of one broad ancestral niche. Article in Journal/Newspaper Arctic charr Arctic North Norway Salvelinus alpinus Subarctic Zooplankton Copepods The Royal Society Arctic Norway Proceedings of the Royal Society B: Biological Sciences 273 1599 2291 2298 |
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Open Polar |
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English |
description |
Two reproductive isolated morphs of Arctic charr ( Salvelinus alpinus ), termed profundal and littoral charr according to their different spawning habitats, co-occur in the postglacial lake Fjellfrøsvatn in North Norway. All profundal charr live in deep water their entire life and have a maximum size of 14 cm, while the littoral charr grow to 40 cm. Some small and young littoral charr move to the profundal zone in an ontogenetic habitat shift in the ice-free season and the rest of the population remains in epilimnic waters. The two morphs had different diet niches in the profundal zone: the profundal charr ate typical soft-bottom prey (chironomid larvae, pea mussels and benthic copepods), while the young littoral charr mainly consumed crustacean zooplankton. In four other lakes without a profundal morph (i.e. monomorphic populations), young charr also performed ontogenetic habitat shifts to the profundal zone and fed on zooplankton. The profundal morph of Fjellfrøsvatn therefore utilize a food resource niche that neither the littoral morph nor comparable monomorphic populations exploit. This suggests that intraspecific resource competition has driven incipient ecological speciation of the profundal charr of Fjellfrøsvatn. The exploitation of the soft-bottom resources by the profundal charr supports earlier experimental findings that the profundal morph is genetically different in trophic behaviour and morphology. The sympatric ecological divergence within the profundal habitat is possible because unexploited food resources (soft-bottom profundal prey) are available. Apparently, this represents a case of incipient segregation by expansion to new resource types (niche invasion), and not by subdivision of one broad ancestral niche. |
format |
Article in Journal/Newspaper |
author |
Knudsen, Rune Klemetsen, Anders Amundsen, Per-Arne Hermansen, Bjørn |
spellingShingle |
Knudsen, Rune Klemetsen, Anders Amundsen, Per-Arne Hermansen, Bjørn Incipient speciation through niche expansion: an example from the Arctic charr in a subarctic lake |
author_facet |
Knudsen, Rune Klemetsen, Anders Amundsen, Per-Arne Hermansen, Bjørn |
author_sort |
Knudsen, Rune |
title |
Incipient speciation through niche expansion: an example from the Arctic charr in a subarctic lake |
title_short |
Incipient speciation through niche expansion: an example from the Arctic charr in a subarctic lake |
title_full |
Incipient speciation through niche expansion: an example from the Arctic charr in a subarctic lake |
title_fullStr |
Incipient speciation through niche expansion: an example from the Arctic charr in a subarctic lake |
title_full_unstemmed |
Incipient speciation through niche expansion: an example from the Arctic charr in a subarctic lake |
title_sort |
incipient speciation through niche expansion: an example from the arctic charr in a subarctic lake |
publisher |
The Royal Society |
publishDate |
2006 |
url |
http://dx.doi.org/10.1098/rspb.2006.3582 https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.2006.3582 https://royalsocietypublishing.org/doi/full-xml/10.1098/rspb.2006.3582 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic charr Arctic North Norway Salvelinus alpinus Subarctic Zooplankton Copepods |
genre_facet |
Arctic charr Arctic North Norway Salvelinus alpinus Subarctic Zooplankton Copepods |
op_source |
Proceedings of the Royal Society B: Biological Sciences volume 273, issue 1599, page 2291-2298 ISSN 0962-8452 1471-2954 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rspb.2006.3582 |
container_title |
Proceedings of the Royal Society B: Biological Sciences |
container_volume |
273 |
container_issue |
1599 |
container_start_page |
2291 |
op_container_end_page |
2298 |
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1800744102819528704 |