Growth of juvenile chinook salmon (Oncorhynchus tshawytscha) as an indicator of density-dependence in the Chena River
Thesis (M.S.) University of Alaska Fairbanks, 2012 In management of Pacific salmon, it is often assumed that density-dependent factors, mediated by the physical environment during freshwater residency, regulate population size prior to smolting and outmigration. However, in years following low escap...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/10938 2023-05-15T15:09:00+02:00 Growth of juvenile chinook salmon (Oncorhynchus tshawytscha) as an indicator of density-dependence in the Chena River Perry, Megan T. 2012-08 http://hdl.handle.net/11122/10938 en_US eng http://hdl.handle.net/11122/10938 Department of Biology and Wildlife Chinook salmon growth Alaska Chena River Thesis ms 2012 ftunivalaska 2023-02-23T21:37:35Z Thesis (M.S.) University of Alaska Fairbanks, 2012 In management of Pacific salmon, it is often assumed that density-dependent factors, mediated by the physical environment during freshwater residency, regulate population size prior to smolting and outmigration. However, in years following low escapement, temperature may be setting the upper limit on growth of juvenile chinook salmon Oncorhynchus tshawytscha during the summer rearing period. Given the importance of juvenile salmon survival for the eventual adult population size, we require a greater understanding of how density-dependent and independent factors affect juvenile demography through time. In this study we tested the hypotheses that (1) juvenile chinook salmon in the Chena River are food limited, and (2) that freshwater growth of juvenile chinook salmon is positively related with marine survival. We tested the first hypotheses using an in-situ supplemental feeding experiment, and the second hypothesis by conducting a retrospective analysis on juvenile growth estimated using a bioenergetics model related to return per spawner estimates from a stock-recruit analysis. We did not find evidence of food limitation, nor evidence that marine survival is correlated with freshwater growth. However, we did find some evidence suggesting that growth during the freshwater rearing period may be limited by food availability following years when adult escapement is high. Arctic Yukon Kuskokwim Sustainable Salmon Initiative Thesis Arctic Kuskokwim Alaska Yukon University of Alaska: ScholarWorks@UA Arctic Fairbanks Pacific Yukon |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Chinook salmon growth Alaska Chena River |
spellingShingle |
Chinook salmon growth Alaska Chena River Perry, Megan T. Growth of juvenile chinook salmon (Oncorhynchus tshawytscha) as an indicator of density-dependence in the Chena River |
topic_facet |
Chinook salmon growth Alaska Chena River |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2012 In management of Pacific salmon, it is often assumed that density-dependent factors, mediated by the physical environment during freshwater residency, regulate population size prior to smolting and outmigration. However, in years following low escapement, temperature may be setting the upper limit on growth of juvenile chinook salmon Oncorhynchus tshawytscha during the summer rearing period. Given the importance of juvenile salmon survival for the eventual adult population size, we require a greater understanding of how density-dependent and independent factors affect juvenile demography through time. In this study we tested the hypotheses that (1) juvenile chinook salmon in the Chena River are food limited, and (2) that freshwater growth of juvenile chinook salmon is positively related with marine survival. We tested the first hypotheses using an in-situ supplemental feeding experiment, and the second hypothesis by conducting a retrospective analysis on juvenile growth estimated using a bioenergetics model related to return per spawner estimates from a stock-recruit analysis. We did not find evidence of food limitation, nor evidence that marine survival is correlated with freshwater growth. However, we did find some evidence suggesting that growth during the freshwater rearing period may be limited by food availability following years when adult escapement is high. Arctic Yukon Kuskokwim Sustainable Salmon Initiative |
format |
Thesis |
author |
Perry, Megan T. |
author_facet |
Perry, Megan T. |
author_sort |
Perry, Megan T. |
title |
Growth of juvenile chinook salmon (Oncorhynchus tshawytscha) as an indicator of density-dependence in the Chena River |
title_short |
Growth of juvenile chinook salmon (Oncorhynchus tshawytscha) as an indicator of density-dependence in the Chena River |
title_full |
Growth of juvenile chinook salmon (Oncorhynchus tshawytscha) as an indicator of density-dependence in the Chena River |
title_fullStr |
Growth of juvenile chinook salmon (Oncorhynchus tshawytscha) as an indicator of density-dependence in the Chena River |
title_full_unstemmed |
Growth of juvenile chinook salmon (Oncorhynchus tshawytscha) as an indicator of density-dependence in the Chena River |
title_sort |
growth of juvenile chinook salmon (oncorhynchus tshawytscha) as an indicator of density-dependence in the chena river |
publishDate |
2012 |
url |
http://hdl.handle.net/11122/10938 |
geographic |
Arctic Fairbanks Pacific Yukon |
geographic_facet |
Arctic Fairbanks Pacific Yukon |
genre |
Arctic Kuskokwim Alaska Yukon |
genre_facet |
Arctic Kuskokwim Alaska Yukon |
op_relation |
http://hdl.handle.net/11122/10938 Department of Biology and Wildlife |
_version_ |
1766340253773201408 |