Active feeding of downstream migrating juvenile pink salmon ( Oncorhynchus gorbuscha ) revealed in a large Barents Sea river using diet and stable isotope analysis
Abstract The recent, rapid spreading of non‐native pink salmon Oncorhynchus gorbuscha in the North Atlantic area has raised concerns about their possible negative impacts on native salmonid species. Potential interactions include competition for food resources during the short freshwater phase of ju...
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Online Access: | http://dx.doi.org/10.1111/jfb.15625 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.15625 |
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crwiley:10.1111/jfb.15625 2024-04-14T08:09:38+00:00 Active feeding of downstream migrating juvenile pink salmon ( Oncorhynchus gorbuscha ) revealed in a large Barents Sea river using diet and stable isotope analysis Erkinaro, Jaakko Orell, Panu Kytökorpi, Mikko Pohjola, Jan‐Peter Power, Michael Ulkoministeriö 2023 http://dx.doi.org/10.1111/jfb.15625 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.15625 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Journal of Fish Biology volume 104, issue 3, page 797-806 ISSN 0022-1112 1095-8649 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2023 crwiley https://doi.org/10.1111/jfb.15625 2024-03-19T10:53:58Z Abstract The recent, rapid spreading of non‐native pink salmon Oncorhynchus gorbuscha in the North Atlantic area has raised concerns about their possible negative impacts on native salmonid species. Potential interactions include competition for food resources during the short freshwater phase of juvenile O. gorbuscha , but little is known about their feeding behavior in the newly occupied North Atlantic rivers. Using stable isotope and stomach content analyses, patterns of freshwater feeding of non‐native O. gorbuscha fry were studied in a large Fennoscandian river, the Teno, that discharges to the Barents Sea. Changes in stable isotope values (δ 13 C, δ 15 N, δ 34 S) and stomach contents from the period of emergence (April to mid‐May) to estuarine entry (late May/June) were examined and provided both temporally integrated and short‐term indicators of freshwater feeding dependency. In addition, the occurrence of juvenile O. gorbuscha and changes in their length and weight during their emergence/migration period were investigated. Juvenile O. gorbuscha were at the spawning grounds from April through to mid‐May with abundance peaking in mid‐May. Fish moved to the estuary by late May and their abundance decreased toward June, and their body size increased concurrently. Stomach analyses indicated no feeding activity in April–early May in the spawning areas, but the stomach fullness indices increased markedly in fish sampled in the estuary in May and June. The most important prey items in stomachs were Chironomidae and Ephemeroptera larvae. Significant changes in all analysed stable isotopes were detected among sample periods, with a peak in mid‐May and June showing significantly lower values than other sample periods. A change from the higher values reflective of parental marine feeding to the lower values reflective of freshwater feeding indicated active in‐river feeding by juveniles during the study period. The documented active freshwater feeding of non‐native juvenile O. gorbuscha suggests potential resource ... Article in Journal/Newspaper Barents Sea Fennoscandian North Atlantic Oncorhynchus gorbuscha Pink salmon Wiley Online Library Barents Sea Teno ENVELOPE(25.690,25.690,68.925,68.925) Journal of Fish Biology 104 3 797 806 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Erkinaro, Jaakko Orell, Panu Kytökorpi, Mikko Pohjola, Jan‐Peter Power, Michael Active feeding of downstream migrating juvenile pink salmon ( Oncorhynchus gorbuscha ) revealed in a large Barents Sea river using diet and stable isotope analysis |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract The recent, rapid spreading of non‐native pink salmon Oncorhynchus gorbuscha in the North Atlantic area has raised concerns about their possible negative impacts on native salmonid species. Potential interactions include competition for food resources during the short freshwater phase of juvenile O. gorbuscha , but little is known about their feeding behavior in the newly occupied North Atlantic rivers. Using stable isotope and stomach content analyses, patterns of freshwater feeding of non‐native O. gorbuscha fry were studied in a large Fennoscandian river, the Teno, that discharges to the Barents Sea. Changes in stable isotope values (δ 13 C, δ 15 N, δ 34 S) and stomach contents from the period of emergence (April to mid‐May) to estuarine entry (late May/June) were examined and provided both temporally integrated and short‐term indicators of freshwater feeding dependency. In addition, the occurrence of juvenile O. gorbuscha and changes in their length and weight during their emergence/migration period were investigated. Juvenile O. gorbuscha were at the spawning grounds from April through to mid‐May with abundance peaking in mid‐May. Fish moved to the estuary by late May and their abundance decreased toward June, and their body size increased concurrently. Stomach analyses indicated no feeding activity in April–early May in the spawning areas, but the stomach fullness indices increased markedly in fish sampled in the estuary in May and June. The most important prey items in stomachs were Chironomidae and Ephemeroptera larvae. Significant changes in all analysed stable isotopes were detected among sample periods, with a peak in mid‐May and June showing significantly lower values than other sample periods. A change from the higher values reflective of parental marine feeding to the lower values reflective of freshwater feeding indicated active in‐river feeding by juveniles during the study period. The documented active freshwater feeding of non‐native juvenile O. gorbuscha suggests potential resource ... |
author2 |
Ulkoministeriö |
format |
Article in Journal/Newspaper |
author |
Erkinaro, Jaakko Orell, Panu Kytökorpi, Mikko Pohjola, Jan‐Peter Power, Michael |
author_facet |
Erkinaro, Jaakko Orell, Panu Kytökorpi, Mikko Pohjola, Jan‐Peter Power, Michael |
author_sort |
Erkinaro, Jaakko |
title |
Active feeding of downstream migrating juvenile pink salmon ( Oncorhynchus gorbuscha ) revealed in a large Barents Sea river using diet and stable isotope analysis |
title_short |
Active feeding of downstream migrating juvenile pink salmon ( Oncorhynchus gorbuscha ) revealed in a large Barents Sea river using diet and stable isotope analysis |
title_full |
Active feeding of downstream migrating juvenile pink salmon ( Oncorhynchus gorbuscha ) revealed in a large Barents Sea river using diet and stable isotope analysis |
title_fullStr |
Active feeding of downstream migrating juvenile pink salmon ( Oncorhynchus gorbuscha ) revealed in a large Barents Sea river using diet and stable isotope analysis |
title_full_unstemmed |
Active feeding of downstream migrating juvenile pink salmon ( Oncorhynchus gorbuscha ) revealed in a large Barents Sea river using diet and stable isotope analysis |
title_sort |
active feeding of downstream migrating juvenile pink salmon ( oncorhynchus gorbuscha ) revealed in a large barents sea river using diet and stable isotope analysis |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/jfb.15625 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.15625 |
long_lat |
ENVELOPE(25.690,25.690,68.925,68.925) |
geographic |
Barents Sea Teno |
geographic_facet |
Barents Sea Teno |
genre |
Barents Sea Fennoscandian North Atlantic Oncorhynchus gorbuscha Pink salmon |
genre_facet |
Barents Sea Fennoscandian North Atlantic Oncorhynchus gorbuscha Pink salmon |
op_source |
Journal of Fish Biology volume 104, issue 3, page 797-806 ISSN 0022-1112 1095-8649 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/jfb.15625 |
container_title |
Journal of Fish Biology |
container_volume |
104 |
container_issue |
3 |
container_start_page |
797 |
op_container_end_page |
806 |
_version_ |
1796307124012187648 |