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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| Format: | Article |
| Language: | English |
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Nature Portfolio
2021-06-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-021-91405-x |
| _version_ | 1818343775787810816 |
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| author | Jan Grimsrud Davidsen Xavier Bordeleau Sindre Håvarstein Eldøy Frederick Whoriskey Michael Power Glenn T. Crossin Colin Buhariwalla Philippe Gaudin |
| author_facet | Jan Grimsrud Davidsen Xavier Bordeleau Sindre Håvarstein Eldøy Frederick Whoriskey Michael Power Glenn T. Crossin Colin Buhariwalla Philippe Gaudin |
| author_sort | Jan Grimsrud Davidsen |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-13T16:35:57Z |
| format | Article |
| id | doaj.art-853ac7d1f1af4a9fa805ca303443e897 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-13T16:35:57Z |
| publishDate | 2021-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-853ac7d1f1af4a9fa805ca303443e8972022-12-21T23:38:23ZengNature PortfolioScientific Reports2045-23222021-06-0111111310.1038/s41598-021-91405-xMarine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelagoJan Grimsrud Davidsen0Xavier Bordeleau1Sindre Håvarstein Eldøy2Frederick Whoriskey3Michael Power4Glenn T. Crossin5Colin Buhariwalla6Philippe Gaudin7NTNU University Museum, Norwegian University of Science and TechnologyDepartment of Biology, Dalhousie UniversityNTNU University Museum, Norwegian University of Science and TechnologyOcean Tracking Network, Dalhousie UniversityDepartment of Biology, University of WaterlooDepartment of Biology, Dalhousie UniversityNova Scotia Department of Fisheries and AquacultureUniversité de Pau et des Pays de l’Adour, e2s UPPA, INRAE, ECOBIOP, Aquapôle INRAEAbstract 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.https://doi.org/10.1038/s41598-021-91405-x |
| spellingShingle | Jan Grimsrud Davidsen Xavier Bordeleau Sindre Håvarstein Eldøy Frederick Whoriskey Michael Power Glenn T. Crossin Colin Buhariwalla Philippe Gaudin Marine habitat use and feeding ecology of introduced anadromous brown trout at the colonization front of the sub-Antarctic Kerguelen archipelago Scientific Reports |
| title | 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_short | 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 |
| url | https://doi.org/10.1038/s41598-021-91405-x |
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