Marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelago
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 slowe...
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2823034 2023-05-15T13:34:02+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 G. Power, Michael John Crossin, Glenn T Buhariwalla, Colin Gaudin, Philippe 2021 application/pdf https://hdl.handle.net/11250/2823034 https://doi.org/10.1038/s41598-021-91405-x eng eng Nature Research urn:issn:2045-2322 https://hdl.handle.net/11250/2823034 https://doi.org/10.1038/s41598-021-91405-x cristin:1912626 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 11 Scientific Reports Journal article Peer reviewed 2021 ftntnutrondheimi https://doi.org/10.1038/s41598-021-91405-x 2021-10-20T22:35:41Z 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. publishedVersion Article in Journal/Newspaper Antarc* Antarctic NTNU Open Archive (Norwegian University of Science and Technology) Antarctic Kerguelen Scientific Reports 11 1 |
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Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
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ftntnutrondheimi |
language |
English |
description |
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. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Davidsen, Jan Grimsrud Bordeleau, Xavier Eldøy, Sindre Håvarstein Whoriskey, Frederick G. Power, Michael John Crossin, Glenn T Buhariwalla, Colin Gaudin, Philippe |
spellingShingle |
Davidsen, Jan Grimsrud Bordeleau, Xavier Eldøy, Sindre Håvarstein Whoriskey, Frederick G. Power, Michael John 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 |
author_facet |
Davidsen, Jan Grimsrud Bordeleau, Xavier Eldøy, Sindre Håvarstein Whoriskey, Frederick G. Power, Michael John 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 |
Nature Research |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2823034 https://doi.org/10.1038/s41598-021-91405-x |
geographic |
Antarctic Kerguelen |
geographic_facet |
Antarctic Kerguelen |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
11 Scientific Reports |
op_relation |
urn:issn:2045-2322 https://hdl.handle.net/11250/2823034 https://doi.org/10.1038/s41598-021-91405-x cristin:1912626 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
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 |
_version_ |
1766048257105985536 |