Landscape characteristics influence climate change effects on juvenile chinook and coho salmon rearing habitat in the Kenai River watershed
Thesis (M.S.) University of Alaska Fairbanks, 2020 Changes in temperature and precipitation as a result of ongoing climate warming in south-central Alaska are affecting juvenile salmon rearing habitat differently across watersheds. Work presented here simulates summer growth rates of juvenile Chinoo...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/12313 2023-05-15T15:16:37+02:00 Landscape characteristics influence climate change effects on juvenile chinook and coho salmon rearing habitat in the Kenai River watershed Meyer, Benjamin Rinella, Daniel Wipfli, Mark Schoen, Erik Falke, Jeffrey 2020-08 http://hdl.handle.net/11122/12313 en_US eng http://hdl.handle.net/11122/12313 Department of Fisheries Chinook salmon Coho salmon Habitat Global warming Alaska Kenai River Watershed Master of Science in Fisheries Thesis ms 2020 ftunivalaska 2023-02-23T21:37:53Z Thesis (M.S.) University of Alaska Fairbanks, 2020 Changes in temperature and precipitation as a result of ongoing climate warming in south-central Alaska are affecting juvenile salmon rearing habitat differently across watersheds. Work presented here simulates summer growth rates of juvenile Chinook and coho salmon in streams under future climate and feeding scenarios in the Kenai River (Alaska) watershed across a spectrum of landscape settings from lowland to glacially-influenced. I used field-derived data on water temperature, diet, and body size as inputs to bioenergetics models to simulate growth for the 2030-2039 and 2060-2069 time periods, comparing back to 2010-2019. My results suggest decreasing growth rates under most future scenarios; predicted changes were of lower magnitude in the cooler glacial watershed and main stem and more in montane and lowland watersheds. The results demonstrate how stream and landscape types differentially filter a climate signal to juvenile rearing salmon habitat and contribute to a broader portfolio of habitats in early life stages. Additionally, I examined two years of summer water temperature data from sites throughout our study tributaries to assess the degree to which lower-reach sites are representative of upstream thermal regimes. I found that the lower reaches in the lowland and glacial study watersheds were reasonably representative of daily and seasonal main stem thermal conditions upstream, while in the montane study watershed (elevation and gradient mid-way between the lowland watershed) upstream conditions were less consistent and thus less suitable for thermal characterization by a lower-reach site alone. Together, this work highlights examples of the importance of accounting for habitat diversity when assessing climate change impacts to salmon-bearing streams. University of Alaska Fairbanks Arctic Biology Summer Graduate Research Award, Nicholas Hughes Memorial Scholarship, University of Alaska Department of Biology and Wildlife General introduction -- ... Thesis Arctic Climate change Global warming Alaska University of Alaska: ScholarWorks@UA Arctic Fairbanks |
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Open Polar |
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University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Chinook salmon Coho salmon Habitat Global warming Alaska Kenai River Watershed Master of Science in Fisheries |
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Chinook salmon Coho salmon Habitat Global warming Alaska Kenai River Watershed Master of Science in Fisheries Meyer, Benjamin Landscape characteristics influence climate change effects on juvenile chinook and coho salmon rearing habitat in the Kenai River watershed |
topic_facet |
Chinook salmon Coho salmon Habitat Global warming Alaska Kenai River Watershed Master of Science in Fisheries |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2020 Changes in temperature and precipitation as a result of ongoing climate warming in south-central Alaska are affecting juvenile salmon rearing habitat differently across watersheds. Work presented here simulates summer growth rates of juvenile Chinook and coho salmon in streams under future climate and feeding scenarios in the Kenai River (Alaska) watershed across a spectrum of landscape settings from lowland to glacially-influenced. I used field-derived data on water temperature, diet, and body size as inputs to bioenergetics models to simulate growth for the 2030-2039 and 2060-2069 time periods, comparing back to 2010-2019. My results suggest decreasing growth rates under most future scenarios; predicted changes were of lower magnitude in the cooler glacial watershed and main stem and more in montane and lowland watersheds. The results demonstrate how stream and landscape types differentially filter a climate signal to juvenile rearing salmon habitat and contribute to a broader portfolio of habitats in early life stages. Additionally, I examined two years of summer water temperature data from sites throughout our study tributaries to assess the degree to which lower-reach sites are representative of upstream thermal regimes. I found that the lower reaches in the lowland and glacial study watersheds were reasonably representative of daily and seasonal main stem thermal conditions upstream, while in the montane study watershed (elevation and gradient mid-way between the lowland watershed) upstream conditions were less consistent and thus less suitable for thermal characterization by a lower-reach site alone. Together, this work highlights examples of the importance of accounting for habitat diversity when assessing climate change impacts to salmon-bearing streams. University of Alaska Fairbanks Arctic Biology Summer Graduate Research Award, Nicholas Hughes Memorial Scholarship, University of Alaska Department of Biology and Wildlife General introduction -- ... |
author2 |
Rinella, Daniel Wipfli, Mark Schoen, Erik Falke, Jeffrey |
format |
Thesis |
author |
Meyer, Benjamin |
author_facet |
Meyer, Benjamin |
author_sort |
Meyer, Benjamin |
title |
Landscape characteristics influence climate change effects on juvenile chinook and coho salmon rearing habitat in the Kenai River watershed |
title_short |
Landscape characteristics influence climate change effects on juvenile chinook and coho salmon rearing habitat in the Kenai River watershed |
title_full |
Landscape characteristics influence climate change effects on juvenile chinook and coho salmon rearing habitat in the Kenai River watershed |
title_fullStr |
Landscape characteristics influence climate change effects on juvenile chinook and coho salmon rearing habitat in the Kenai River watershed |
title_full_unstemmed |
Landscape characteristics influence climate change effects on juvenile chinook and coho salmon rearing habitat in the Kenai River watershed |
title_sort |
landscape characteristics influence climate change effects on juvenile chinook and coho salmon rearing habitat in the kenai river watershed |
publishDate |
2020 |
url |
http://hdl.handle.net/11122/12313 |
geographic |
Arctic Fairbanks |
geographic_facet |
Arctic Fairbanks |
genre |
Arctic Climate change Global warming Alaska |
genre_facet |
Arctic Climate change Global warming Alaska |
op_relation |
http://hdl.handle.net/11122/12313 Department of Fisheries |
_version_ |
1766346926205173760 |