Marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelago
Abstract In 1954, brown trout were introduced to the Kerguelen archipelago (49°S, 70°E), a pristine, sub-Antarctic environment previously devoid of native freshwater fishes. Trout began spreading rapidly via coastal waters to colonize adjacent watersheds, however, recent and unexpectedly the spread...
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Online Access: | http://dx.doi.org/10.1038/s41598-021-91405-x http://www.nature.com/articles/s41598-021-91405-x.pdf http://www.nature.com/articles/s41598-021-91405-x |
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crspringernat:10.1038/s41598-021-91405-x 2023-05-15T14:08:04+02:00 Marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelago Davidsen, Jan Grimsrud Bordeleau, Xavier Eldøy, Sindre Håvarstein Whoriskey, Frederick Power, Michael Crossin, Glenn T. Buhariwalla, Colin Gaudin, Philippe Institut Polaire Français Paul Emile Victor NTNU University Museum Terres Australes et Antarctiques Françaises Dalhousie University’s Ocean Tracking Network Natural Sciences and Engineering Research Council of Canada Zone Atelier Antarctique et Terres Australes 2021 http://dx.doi.org/10.1038/s41598-021-91405-x http://www.nature.com/articles/s41598-021-91405-x.pdf http://www.nature.com/articles/s41598-021-91405-x en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Scientific Reports volume 11, issue 1 ISSN 2045-2322 Multidisciplinary journal-article 2021 crspringernat https://doi.org/10.1038/s41598-021-91405-x 2022-01-04T10:50:22Z Abstract In 1954, brown trout were introduced to the Kerguelen archipelago (49°S, 70°E), a pristine, sub-Antarctic environment previously devoid of native freshwater fishes. Trout began spreading rapidly via coastal waters to colonize adjacent watersheds, however, recent and unexpectedly the spread has slowed. To better understand the ecology of the brown trout here, and why their expansion has slowed, we documented the marine habitat use, foraging ecology, and environmental conditions experienced over one year by 50 acoustically tagged individuals at the colonization front. Trout mainly utilized the marine habitat proximate to their tagging site, ranging no further than 7 km and not entering any uncolonized watersheds. Nutritional indicators showed that trout were in good condition at the time of tagging. Stomach contents and isotope signatures in muscle of additional trout revealed a diet of amphipods (68%), fish (23%), isopods (6%), and zooplankton (6%). The small migration distances observed, presence of suitable habitat, and rich local foraging opportunities suggest that trout can achieve their resource needs close to their home rivers. This may explain why the expansion of brown trout at Kerguelen has slowed. Article in Journal/Newspaper Antarc* Antarctic Springer Nature (via Crossref) Antarctic Kerguelen Scientific Reports 11 1 |
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Springer Nature (via Crossref) |
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crspringernat |
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English |
topic |
Multidisciplinary |
spellingShingle |
Multidisciplinary Davidsen, Jan Grimsrud Bordeleau, Xavier Eldøy, Sindre Håvarstein Whoriskey, Frederick Power, Michael Crossin, Glenn T. Buhariwalla, Colin Gaudin, Philippe Marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelago |
topic_facet |
Multidisciplinary |
description |
Abstract In 1954, brown trout were introduced to the Kerguelen archipelago (49°S, 70°E), a pristine, sub-Antarctic environment previously devoid of native freshwater fishes. Trout began spreading rapidly via coastal waters to colonize adjacent watersheds, however, recent and unexpectedly the spread has slowed. To better understand the ecology of the brown trout here, and why their expansion has slowed, we documented the marine habitat use, foraging ecology, and environmental conditions experienced over one year by 50 acoustically tagged individuals at the colonization front. Trout mainly utilized the marine habitat proximate to their tagging site, ranging no further than 7 km and not entering any uncolonized watersheds. Nutritional indicators showed that trout were in good condition at the time of tagging. Stomach contents and isotope signatures in muscle of additional trout revealed a diet of amphipods (68%), fish (23%), isopods (6%), and zooplankton (6%). The small migration distances observed, presence of suitable habitat, and rich local foraging opportunities suggest that trout can achieve their resource needs close to their home rivers. This may explain why the expansion of brown trout at Kerguelen has slowed. |
author2 |
Institut Polaire Français Paul Emile Victor NTNU University Museum Terres Australes et Antarctiques Françaises Dalhousie University’s Ocean Tracking Network Natural Sciences and Engineering Research Council of Canada Zone Atelier Antarctique et Terres Australes |
format |
Article in Journal/Newspaper |
author |
Davidsen, Jan Grimsrud Bordeleau, Xavier Eldøy, Sindre Håvarstein Whoriskey, Frederick Power, Michael Crossin, Glenn T. Buhariwalla, Colin Gaudin, Philippe |
author_facet |
Davidsen, Jan Grimsrud Bordeleau, Xavier Eldøy, Sindre Håvarstein Whoriskey, Frederick Power, Michael Crossin, Glenn T. Buhariwalla, Colin Gaudin, Philippe |
author_sort |
Davidsen, Jan Grimsrud |
title |
Marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelago |
title_short |
Marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelago |
title_full |
Marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelago |
title_fullStr |
Marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelago |
title_full_unstemmed |
Marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelago |
title_sort |
marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-antarctic kerguelen archipelago |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1038/s41598-021-91405-x http://www.nature.com/articles/s41598-021-91405-x.pdf http://www.nature.com/articles/s41598-021-91405-x |
geographic |
Antarctic Kerguelen |
geographic_facet |
Antarctic Kerguelen |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Scientific Reports volume 11, issue 1 ISSN 2045-2322 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41598-021-91405-x |
container_title |
Scientific Reports |
container_volume |
11 |
container_issue |
1 |
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1766280100792238080 |