The marine life of Atlantic salmon: evidence from the chemistry of scales

This research provides a new method to identify likely marine feeding grounds for migratory pelagic species that are problematic to directly study at sea. The method is based on stable isotope compositions of tissues that may be sampled without harming the target animals, and can be conducted retros...

Full description

Bibliographic Details
Main Author: MacKenzie, Kirsteen Morag
Format: Thesis
Language:English
Published: 2010
Subjects:
Online Access:https://eprints.soton.ac.uk/191971/
https://eprints.soton.ac.uk/191971/1/ThesisFinal.pdf
https://eprints.soton.ac.uk/191971/2/AppendixA.xls
https://eprints.soton.ac.uk/191971/3/AppendixB_RiverFrome.xls
https://eprints.soton.ac.uk/191971/4/AppendixC_NortheastCoast.xls
https://eprints.soton.ac.uk/191971/5/Appendix_D.zip
https://eprints.soton.ac.uk/191971/6/Appendix_E.zip
https://eprints.soton.ac.uk/191971/7/ReadMe.docx
id ftsouthampton:oai:eprints.soton.ac.uk:191971
record_format openpolar
spelling ftsouthampton:oai:eprints.soton.ac.uk:191971 2023-07-30T04:02:25+02:00 The marine life of Atlantic salmon: evidence from the chemistry of scales MacKenzie, Kirsteen Morag 2010-09 text spreadsheet archive https://eprints.soton.ac.uk/191971/ https://eprints.soton.ac.uk/191971/1/ThesisFinal.pdf https://eprints.soton.ac.uk/191971/2/AppendixA.xls https://eprints.soton.ac.uk/191971/3/AppendixB_RiverFrome.xls https://eprints.soton.ac.uk/191971/4/AppendixC_NortheastCoast.xls https://eprints.soton.ac.uk/191971/5/Appendix_D.zip https://eprints.soton.ac.uk/191971/6/Appendix_E.zip https://eprints.soton.ac.uk/191971/7/ReadMe.docx en eng https://eprints.soton.ac.uk/191971/1/ThesisFinal.pdf https://eprints.soton.ac.uk/191971/2/AppendixA.xls https://eprints.soton.ac.uk/191971/3/AppendixB_RiverFrome.xls https://eprints.soton.ac.uk/191971/4/AppendixC_NortheastCoast.xls https://eprints.soton.ac.uk/191971/5/Appendix_D.zip https://eprints.soton.ac.uk/191971/6/Appendix_E.zip https://eprints.soton.ac.uk/191971/7/ReadMe.docx MacKenzie, Kirsteen Morag (2010) The marine life of Atlantic salmon: evidence from the chemistry of scales. University of Southampton, School of Ocean and Earth Science, Doctoral Thesis, 183pp. Thesis NonPeerReviewed 2010 ftsouthampton 2023-07-09T21:22:49Z This research provides a new method to identify likely marine feeding grounds for migratory pelagic species that are problematic to directly study at sea. The method is based on stable isotope compositions of tissues that may be sampled without harming the target animals, and can be conducted retrospectively from tissue archives. The wild Atlantic salmon has been in steep decline throughout its native range over the past four decades, largely due to increases in marine mortality. This research investigated potential causes of this decline using stable isotope analysis of archived scale samples, taken from returning adult salmon over the past few decades. Investigations of UK scale holdings identified the River Frome and Northeast Coast Driftnet Fishery archives as the most available and useful, giving good spatial contrast and temporal coverage. After developing sampling and analytical protocols, carbon and nitrogen isotopic composition was measured in grilse (one-sea winter) and multi-sea winter (MSW) salmon scale samples taken from both archives over 23 and 14 years. Analyses were performed on the last marine growth season, giving a retrospective record of marine conditions experienced by each fish. Both isotopes are influenced by baseline environmental conditions, and climatic effects are found to exert strong controls on numbers of fish returning to both the Northeast Coast and River Frome populations. Trophic level and/or baseline nitrate effects are also found to influence returning abundance to these populations, although more strongly in the Frome. Yearly d13C values were correlated with median yearly sea surface temperature values for each degree of latitude and longitude across the North Atlantic, and maps produced of the correlation strengths. These maps suggest likely feeding grounds for each cohort within each population, with the River Frome grilse and MSW salmon respectively feeding near the shelf breaks of northeast and southwest Iceland. The Northeast Coast grilse and MSW salmon were, in ... Thesis Atlantic salmon Iceland North Atlantic University of Southampton: e-Prints Soton
institution Open Polar
collection University of Southampton: e-Prints Soton
op_collection_id ftsouthampton
language English
description This research provides a new method to identify likely marine feeding grounds for migratory pelagic species that are problematic to directly study at sea. The method is based on stable isotope compositions of tissues that may be sampled without harming the target animals, and can be conducted retrospectively from tissue archives. The wild Atlantic salmon has been in steep decline throughout its native range over the past four decades, largely due to increases in marine mortality. This research investigated potential causes of this decline using stable isotope analysis of archived scale samples, taken from returning adult salmon over the past few decades. Investigations of UK scale holdings identified the River Frome and Northeast Coast Driftnet Fishery archives as the most available and useful, giving good spatial contrast and temporal coverage. After developing sampling and analytical protocols, carbon and nitrogen isotopic composition was measured in grilse (one-sea winter) and multi-sea winter (MSW) salmon scale samples taken from both archives over 23 and 14 years. Analyses were performed on the last marine growth season, giving a retrospective record of marine conditions experienced by each fish. Both isotopes are influenced by baseline environmental conditions, and climatic effects are found to exert strong controls on numbers of fish returning to both the Northeast Coast and River Frome populations. Trophic level and/or baseline nitrate effects are also found to influence returning abundance to these populations, although more strongly in the Frome. Yearly d13C values were correlated with median yearly sea surface temperature values for each degree of latitude and longitude across the North Atlantic, and maps produced of the correlation strengths. These maps suggest likely feeding grounds for each cohort within each population, with the River Frome grilse and MSW salmon respectively feeding near the shelf breaks of northeast and southwest Iceland. The Northeast Coast grilse and MSW salmon were, in ...
format Thesis
author MacKenzie, Kirsteen Morag
spellingShingle MacKenzie, Kirsteen Morag
The marine life of Atlantic salmon: evidence from the chemistry of scales
author_facet MacKenzie, Kirsteen Morag
author_sort MacKenzie, Kirsteen Morag
title The marine life of Atlantic salmon: evidence from the chemistry of scales
title_short The marine life of Atlantic salmon: evidence from the chemistry of scales
title_full The marine life of Atlantic salmon: evidence from the chemistry of scales
title_fullStr The marine life of Atlantic salmon: evidence from the chemistry of scales
title_full_unstemmed The marine life of Atlantic salmon: evidence from the chemistry of scales
title_sort marine life of atlantic salmon: evidence from the chemistry of scales
publishDate 2010
url https://eprints.soton.ac.uk/191971/
https://eprints.soton.ac.uk/191971/1/ThesisFinal.pdf
https://eprints.soton.ac.uk/191971/2/AppendixA.xls
https://eprints.soton.ac.uk/191971/3/AppendixB_RiverFrome.xls
https://eprints.soton.ac.uk/191971/4/AppendixC_NortheastCoast.xls
https://eprints.soton.ac.uk/191971/5/Appendix_D.zip
https://eprints.soton.ac.uk/191971/6/Appendix_E.zip
https://eprints.soton.ac.uk/191971/7/ReadMe.docx
genre Atlantic salmon
Iceland
North Atlantic
genre_facet Atlantic salmon
Iceland
North Atlantic
op_relation https://eprints.soton.ac.uk/191971/1/ThesisFinal.pdf
https://eprints.soton.ac.uk/191971/2/AppendixA.xls
https://eprints.soton.ac.uk/191971/3/AppendixB_RiverFrome.xls
https://eprints.soton.ac.uk/191971/4/AppendixC_NortheastCoast.xls
https://eprints.soton.ac.uk/191971/5/Appendix_D.zip
https://eprints.soton.ac.uk/191971/6/Appendix_E.zip
https://eprints.soton.ac.uk/191971/7/ReadMe.docx
MacKenzie, Kirsteen Morag (2010) The marine life of Atlantic salmon: evidence from the chemistry of scales. University of Southampton, School of Ocean and Earth Science, Doctoral Thesis, 183pp.
_version_ 1772813223349714944