Growth, foraging behavior and distribution of age-0 Arctic grayling in an Alaskan stream
Thesis (M.S.) University of Alaska Fairbanks, 2002 I evaluated the ability of three models to relate habitat characteristics to habitat quality for age-0 Arctic grayling Thymallullus arcticus in an Alaska stream. A temperature-based growth model made accurate predictions, showing it can reliably ass...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/6316 2023-05-15T14:31:22+02:00 Growth, foraging behavior and distribution of age-0 Arctic grayling in an Alaskan stream Dion, Cheryl Ann 2002-12 http://hdl.handle.net/11122/6316 en_US eng http://hdl.handle.net/11122/6316 Thesis ms 2002 ftunivalaska 2023-02-23T21:36:38Z Thesis (M.S.) University of Alaska Fairbanks, 2002 I evaluated the ability of three models to relate habitat characteristics to habitat quality for age-0 Arctic grayling Thymallullus arcticus in an Alaska stream. A temperature-based growth model made accurate predictions, showing it can reliably assess thermal habitat quality. Deviations between predicted and observed growth were useful because they identified the timing of possible critical periods, when competition for food or space may cause density-dependent mortality and emigration. A foraging model consistently overestimated the mean prey size of fish, showing that such models need further work before then can accurately assess food availability from invertebrate drift. A habitat selection model accurately predicted small fish would occupy the stream margins and the ontogenetic shift into faster, deeper water, but its detailed predictions for larger fish were not very precise. These models were useful tools for assessing habitat quality and gave insight into possible interactions between habitat characteristics and population dynamics. Thesis Arctic grayling Arctic Alaska University of Alaska: ScholarWorks@UA Arctic Fairbanks |
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Open Polar |
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University of Alaska: ScholarWorks@UA |
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ftunivalaska |
language |
English |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2002 I evaluated the ability of three models to relate habitat characteristics to habitat quality for age-0 Arctic grayling Thymallullus arcticus in an Alaska stream. A temperature-based growth model made accurate predictions, showing it can reliably assess thermal habitat quality. Deviations between predicted and observed growth were useful because they identified the timing of possible critical periods, when competition for food or space may cause density-dependent mortality and emigration. A foraging model consistently overestimated the mean prey size of fish, showing that such models need further work before then can accurately assess food availability from invertebrate drift. A habitat selection model accurately predicted small fish would occupy the stream margins and the ontogenetic shift into faster, deeper water, but its detailed predictions for larger fish were not very precise. These models were useful tools for assessing habitat quality and gave insight into possible interactions between habitat characteristics and population dynamics. |
format |
Thesis |
author |
Dion, Cheryl Ann |
spellingShingle |
Dion, Cheryl Ann Growth, foraging behavior and distribution of age-0 Arctic grayling in an Alaskan stream |
author_facet |
Dion, Cheryl Ann |
author_sort |
Dion, Cheryl Ann |
title |
Growth, foraging behavior and distribution of age-0 Arctic grayling in an Alaskan stream |
title_short |
Growth, foraging behavior and distribution of age-0 Arctic grayling in an Alaskan stream |
title_full |
Growth, foraging behavior and distribution of age-0 Arctic grayling in an Alaskan stream |
title_fullStr |
Growth, foraging behavior and distribution of age-0 Arctic grayling in an Alaskan stream |
title_full_unstemmed |
Growth, foraging behavior and distribution of age-0 Arctic grayling in an Alaskan stream |
title_sort |
growth, foraging behavior and distribution of age-0 arctic grayling in an alaskan stream |
publishDate |
2002 |
url |
http://hdl.handle.net/11122/6316 |
geographic |
Arctic Fairbanks |
geographic_facet |
Arctic Fairbanks |
genre |
Arctic grayling Arctic Alaska |
genre_facet |
Arctic grayling Arctic Alaska |
op_relation |
http://hdl.handle.net/11122/6316 |
_version_ |
1766305020033105920 |