A comparison of sockeye salmon (Oncorhynchus nerka) in two climate regimes in the north Pacific Ocean using stable carbon and nitrogren isotope ratios
Thesis (M.S.) University of Alaska Fairbanks, 2000 This study explores how the climate shift in the late 1970's impacted sockeye salmon feeding. Stable isotope ratios (¹³C and ¹⁵N) of recent muscle and scale tissues from five mature salmon species are highly correlated (R²=0.96 and 0.91, respec...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/6786 2023-05-15T17:04:41+02:00 A comparison of sockeye salmon (Oncorhynchus nerka) in two climate regimes in the north Pacific Ocean using stable carbon and nitrogren isotope ratios Satterfield, Franklin Robert 2000-12 http://hdl.handle.net/11122/6786 en_US eng http://hdl.handle.net/11122/6786 Graduate Program in Marine Science and Limnology Thesis ms 2000 ftunivalaska 2023-02-23T21:36:43Z Thesis (M.S.) University of Alaska Fairbanks, 2000 This study explores how the climate shift in the late 1970's impacted sockeye salmon feeding. Stable isotope ratios (¹³C and ¹⁵N) of recent muscle and scale tissues from five mature salmon species are highly correlated (R²=0.96 and 0.91, respectively), validating the use of archived scales for retrospective analysis. These data suggest a trophic separation by species with chinook occupying the highest level, followed by coho with some degree of overlap among sockeye, pink and chum at the lowest level. Archived scales from four different sockeye stocks from Kodiak Island and Southeast region were analyzed over the last 34 years to investigate changes relative to the 1976-1977 Climate Regime Shift. Most stocks show no statistical differences before and after the regime shift in either isotope. Despite recorded differences in sockeye abundance and size between these two regimes, these data suggest only minor changes in prey items. Thesis Kodiak Alaska University of Alaska: ScholarWorks@UA Fairbanks Pacific Sockeye ENVELOPE(-130.143,-130.143,54.160,54.160) |
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Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2000 This study explores how the climate shift in the late 1970's impacted sockeye salmon feeding. Stable isotope ratios (¹³C and ¹⁵N) of recent muscle and scale tissues from five mature salmon species are highly correlated (R²=0.96 and 0.91, respectively), validating the use of archived scales for retrospective analysis. These data suggest a trophic separation by species with chinook occupying the highest level, followed by coho with some degree of overlap among sockeye, pink and chum at the lowest level. Archived scales from four different sockeye stocks from Kodiak Island and Southeast region were analyzed over the last 34 years to investigate changes relative to the 1976-1977 Climate Regime Shift. Most stocks show no statistical differences before and after the regime shift in either isotope. Despite recorded differences in sockeye abundance and size between these two regimes, these data suggest only minor changes in prey items. |
format |
Thesis |
author |
Satterfield, Franklin Robert |
spellingShingle |
Satterfield, Franklin Robert A comparison of sockeye salmon (Oncorhynchus nerka) in two climate regimes in the north Pacific Ocean using stable carbon and nitrogren isotope ratios |
author_facet |
Satterfield, Franklin Robert |
author_sort |
Satterfield, Franklin Robert |
title |
A comparison of sockeye salmon (Oncorhynchus nerka) in two climate regimes in the north Pacific Ocean using stable carbon and nitrogren isotope ratios |
title_short |
A comparison of sockeye salmon (Oncorhynchus nerka) in two climate regimes in the north Pacific Ocean using stable carbon and nitrogren isotope ratios |
title_full |
A comparison of sockeye salmon (Oncorhynchus nerka) in two climate regimes in the north Pacific Ocean using stable carbon and nitrogren isotope ratios |
title_fullStr |
A comparison of sockeye salmon (Oncorhynchus nerka) in two climate regimes in the north Pacific Ocean using stable carbon and nitrogren isotope ratios |
title_full_unstemmed |
A comparison of sockeye salmon (Oncorhynchus nerka) in two climate regimes in the north Pacific Ocean using stable carbon and nitrogren isotope ratios |
title_sort |
comparison of sockeye salmon (oncorhynchus nerka) in two climate regimes in the north pacific ocean using stable carbon and nitrogren isotope ratios |
publishDate |
2000 |
url |
http://hdl.handle.net/11122/6786 |
long_lat |
ENVELOPE(-130.143,-130.143,54.160,54.160) |
geographic |
Fairbanks Pacific Sockeye |
geographic_facet |
Fairbanks Pacific Sockeye |
genre |
Kodiak Alaska |
genre_facet |
Kodiak Alaska |
op_relation |
http://hdl.handle.net/11122/6786 Graduate Program in Marine Science and Limnology |
_version_ |
1766059000657346560 |