Reconstructing marine life-history strategies of wild Atlantic salmon from the stable isotope composition of otoliths
Long-term declines in abundance of wild Atlantic salmon Salmo salar, L. have been linked to reductions in marine survivorship, and recent reductions in growth condition (a measure of fish quality) have been correlated to increased mid-winter sea-surface temperature anomalies in the eastern North Atl...
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ftjamescook:oai:researchonline.jcu.edu.au:28319 2024-02-11T10:02:06+01:00 Reconstructing marine life-history strategies of wild Atlantic salmon from the stable isotope composition of otoliths Hanson, N.N. Wurster, C.M. Todd, C.D. 2013 application/pdf https://researchonline.jcu.edu.au/28319/1/28319_Hanson_etal_2013.pdf unknown Inter-Research http://dx.doi.org/10.3354/meps10066 https://researchonline.jcu.edu.au/28319/ https://researchonline.jcu.edu.au/28319/1/28319_Hanson_etal_2013.pdf Hanson, N.N., Wurster, C.M., and Todd, C.D. (2013) Reconstructing marine life-history strategies of wild Atlantic salmon from the stable isotope composition of otoliths. Marine Ecology Progress Series, 475. pp. 249-266. open Article PeerReviewed 2013 ftjamescook https://doi.org/10.3354/meps10066 2024-01-22T23:31:14Z Long-term declines in abundance of wild Atlantic salmon Salmo salar, L. have been linked to reductions in marine survivorship, and recent reductions in growth condition (a measure of fish quality) have been correlated to increased mid-winter sea-surface temperature anomalies in the eastern North Atlantic. Establishing a causal link between marine climate and salmon somatic condition is difficult without at-sea measurements of environmental and biological parameters, but electronically tagging these animals to obtain this information is also difficult and costly. The stable isotope composition of oxygen and carbon in the sequential layers of salmon otoliths can provide a basis for retrospective studies of the thermal, metabolic and dietary histories of individual fish. We used high resolution δ¹⁸O and δ¹³C profiles obtained using secondary ion mass spectrometry to compare the marine thermal and metabolic behaviour of 1 sea-winter return-migrant adult salmon. Seasonal and ontogenetic patterns in δ¹⁸O and δ¹³C values dominated isotope variation, although there were marked differences between individual profiles, indicating the potential for large differences in individual migration routes. There was no significant relationship between isotope variation and adult condition. Constructed thermal profiles provided plausible data, but the present uncertainty in otolith thermometry parameters for an open-ocean fish such as Atlantic salmon preclude firm conclusions based on these estimates. Marine life-history variation in otolith δ¹³C is likely driven by ontogenetic changes, both in diet and metabolism with size. A marked and rapid decrease in the δ¹³C values of some fish in the last month(s) of the marine migration could be an indicator of physiological changes occurring during the homing migration. Article in Journal/Newspaper Atlantic salmon North Atlantic Salmo salar James Cook University, Australia: ResearchOnline@JCU Marine Ecology Progress Series 475 249 266 |
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James Cook University, Australia: ResearchOnline@JCU |
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ftjamescook |
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description |
Long-term declines in abundance of wild Atlantic salmon Salmo salar, L. have been linked to reductions in marine survivorship, and recent reductions in growth condition (a measure of fish quality) have been correlated to increased mid-winter sea-surface temperature anomalies in the eastern North Atlantic. Establishing a causal link between marine climate and salmon somatic condition is difficult without at-sea measurements of environmental and biological parameters, but electronically tagging these animals to obtain this information is also difficult and costly. The stable isotope composition of oxygen and carbon in the sequential layers of salmon otoliths can provide a basis for retrospective studies of the thermal, metabolic and dietary histories of individual fish. We used high resolution δ¹⁸O and δ¹³C profiles obtained using secondary ion mass spectrometry to compare the marine thermal and metabolic behaviour of 1 sea-winter return-migrant adult salmon. Seasonal and ontogenetic patterns in δ¹⁸O and δ¹³C values dominated isotope variation, although there were marked differences between individual profiles, indicating the potential for large differences in individual migration routes. There was no significant relationship between isotope variation and adult condition. Constructed thermal profiles provided plausible data, but the present uncertainty in otolith thermometry parameters for an open-ocean fish such as Atlantic salmon preclude firm conclusions based on these estimates. Marine life-history variation in otolith δ¹³C is likely driven by ontogenetic changes, both in diet and metabolism with size. A marked and rapid decrease in the δ¹³C values of some fish in the last month(s) of the marine migration could be an indicator of physiological changes occurring during the homing migration. |
format |
Article in Journal/Newspaper |
author |
Hanson, N.N. Wurster, C.M. Todd, C.D. |
spellingShingle |
Hanson, N.N. Wurster, C.M. Todd, C.D. Reconstructing marine life-history strategies of wild Atlantic salmon from the stable isotope composition of otoliths |
author_facet |
Hanson, N.N. Wurster, C.M. Todd, C.D. |
author_sort |
Hanson, N.N. |
title |
Reconstructing marine life-history strategies of wild Atlantic salmon from the stable isotope composition of otoliths |
title_short |
Reconstructing marine life-history strategies of wild Atlantic salmon from the stable isotope composition of otoliths |
title_full |
Reconstructing marine life-history strategies of wild Atlantic salmon from the stable isotope composition of otoliths |
title_fullStr |
Reconstructing marine life-history strategies of wild Atlantic salmon from the stable isotope composition of otoliths |
title_full_unstemmed |
Reconstructing marine life-history strategies of wild Atlantic salmon from the stable isotope composition of otoliths |
title_sort |
reconstructing marine life-history strategies of wild atlantic salmon from the stable isotope composition of otoliths |
publisher |
Inter-Research |
publishDate |
2013 |
url |
https://researchonline.jcu.edu.au/28319/1/28319_Hanson_etal_2013.pdf |
genre |
Atlantic salmon North Atlantic Salmo salar |
genre_facet |
Atlantic salmon North Atlantic Salmo salar |
op_relation |
http://dx.doi.org/10.3354/meps10066 https://researchonline.jcu.edu.au/28319/ https://researchonline.jcu.edu.au/28319/1/28319_Hanson_etal_2013.pdf Hanson, N.N., Wurster, C.M., and Todd, C.D. (2013) Reconstructing marine life-history strategies of wild Atlantic salmon from the stable isotope composition of otoliths. Marine Ecology Progress Series, 475. pp. 249-266. |
op_rights |
open |
op_doi |
https://doi.org/10.3354/meps10066 |
container_title |
Marine Ecology Progress Series |
container_volume |
475 |
container_start_page |
249 |
op_container_end_page |
266 |
_version_ |
1790597999454322688 |