Among‐individual diet variation within a lake trout ecotype: Lack of stability of niche use
Abstract In a polyphenic species, differences in resource use are expected among ecotypes, and homogeneity in resource use is expected within an ecotype. Yet, using a broad resource spectrum has been identified as a strategy for fishes living in unproductive northern environments, where food is patc...
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Online Access: | http://dx.doi.org/10.1002/ece3.7158 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.7158 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.7158 |
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crwiley:10.1002/ece3.7158 2024-09-15T18:08:12+00:00 Among‐individual diet variation within a lake trout ecotype: Lack of stability of niche use Chavarie, Louise Howland, Kimberly L. Harris, Les N. Gallagher, Colin P. Hansen, Michael J. Tonn, William M. Muir, Andrew M. Krueger, Charles C. Great Lakes Fishery Commission Fisheries and Oceans Canada 2021 http://dx.doi.org/10.1002/ece3.7158 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.7158 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.7158 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Ecology and Evolution volume 11, issue 3, page 1457-1475 ISSN 2045-7758 2045-7758 journal-article 2021 crwiley https://doi.org/10.1002/ece3.7158 2024-08-30T04:09:03Z Abstract In a polyphenic species, differences in resource use are expected among ecotypes, and homogeneity in resource use is expected within an ecotype. Yet, using a broad resource spectrum has been identified as a strategy for fishes living in unproductive northern environments, where food is patchily distributed and ephemeral. We investigated whether specialization of trophic resources by individuals occurred within the generalist piscivore ecotype of lake trout from Great Bear Lake, Canada, reflective of a form of diversity. Four distinct dietary patterns of resource use within this lake trout ecotype were detected from fatty acid composition, with some variation linked to spatial patterns within Great Bear Lake. Feeding habits of different groups within the ecotype were not associated with detectable morphological or genetic differentiation, suggesting that behavioral plasticity caused the trophic differences. A low level of genetic differentiation was detected between exceptionally large‐sized individuals and other piscivore individuals. We demonstrated that individual trophic specialization can occur within an ecotype inhabiting a geologically young system (8,000–10,000 yr BP), a lake that sustains high levels of phenotypic diversity of lake trout overall. The characterization of niche use among individuals, as done in this study, is necessary to understand the role that individual variation can play at the beginning of differentiation processes. Article in Journal/Newspaper Great Bear Lake Wiley Online Library Ecology and Evolution 11 3 1457 1475 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract In a polyphenic species, differences in resource use are expected among ecotypes, and homogeneity in resource use is expected within an ecotype. Yet, using a broad resource spectrum has been identified as a strategy for fishes living in unproductive northern environments, where food is patchily distributed and ephemeral. We investigated whether specialization of trophic resources by individuals occurred within the generalist piscivore ecotype of lake trout from Great Bear Lake, Canada, reflective of a form of diversity. Four distinct dietary patterns of resource use within this lake trout ecotype were detected from fatty acid composition, with some variation linked to spatial patterns within Great Bear Lake. Feeding habits of different groups within the ecotype were not associated with detectable morphological or genetic differentiation, suggesting that behavioral plasticity caused the trophic differences. A low level of genetic differentiation was detected between exceptionally large‐sized individuals and other piscivore individuals. We demonstrated that individual trophic specialization can occur within an ecotype inhabiting a geologically young system (8,000–10,000 yr BP), a lake that sustains high levels of phenotypic diversity of lake trout overall. The characterization of niche use among individuals, as done in this study, is necessary to understand the role that individual variation can play at the beginning of differentiation processes. |
author2 |
Great Lakes Fishery Commission Fisheries and Oceans Canada |
format |
Article in Journal/Newspaper |
author |
Chavarie, Louise Howland, Kimberly L. Harris, Les N. Gallagher, Colin P. Hansen, Michael J. Tonn, William M. Muir, Andrew M. Krueger, Charles C. |
spellingShingle |
Chavarie, Louise Howland, Kimberly L. Harris, Les N. Gallagher, Colin P. Hansen, Michael J. Tonn, William M. Muir, Andrew M. Krueger, Charles C. Among‐individual diet variation within a lake trout ecotype: Lack of stability of niche use |
author_facet |
Chavarie, Louise Howland, Kimberly L. Harris, Les N. Gallagher, Colin P. Hansen, Michael J. Tonn, William M. Muir, Andrew M. Krueger, Charles C. |
author_sort |
Chavarie, Louise |
title |
Among‐individual diet variation within a lake trout ecotype: Lack of stability of niche use |
title_short |
Among‐individual diet variation within a lake trout ecotype: Lack of stability of niche use |
title_full |
Among‐individual diet variation within a lake trout ecotype: Lack of stability of niche use |
title_fullStr |
Among‐individual diet variation within a lake trout ecotype: Lack of stability of niche use |
title_full_unstemmed |
Among‐individual diet variation within a lake trout ecotype: Lack of stability of niche use |
title_sort |
among‐individual diet variation within a lake trout ecotype: lack of stability of niche use |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/ece3.7158 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.7158 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.7158 |
genre |
Great Bear Lake |
genre_facet |
Great Bear Lake |
op_source |
Ecology and Evolution volume 11, issue 3, page 1457-1475 ISSN 2045-7758 2045-7758 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ece3.7158 |
container_title |
Ecology and Evolution |
container_volume |
11 |
container_issue |
3 |
container_start_page |
1457 |
op_container_end_page |
1475 |
_version_ |
1810445535446827008 |