Environmental and evolutionary processes affecting population dynamics and life-history of arctic grayling in western and Interior Alaska
Thesis (M.S.) University of Alaska Fairbanks, 2005 I compared the life-history and population dynamics of arctic grayling Thymallus arcticus in western and Interior Alaska. Fish in western Alaska grew rapidly to a large maximum size, adult mortality rates were low and juvenile mortality rates were h...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/6136 2023-05-15T14:31:20+02:00 Environmental and evolutionary processes affecting population dynamics and life-history of arctic grayling in western and Interior Alaska Neyme, Jenny Lou 2005-08 http://hdl.handle.net/11122/6136 en_US eng http://hdl.handle.net/11122/6136 Fisheries Division Thesis ms 2005 ftunivalaska 2023-02-23T21:36:35Z Thesis (M.S.) University of Alaska Fairbanks, 2005 I compared the life-history and population dynamics of arctic grayling Thymallus arcticus in western and Interior Alaska. Fish in western Alaska grew rapidly to a large maximum size, adult mortality rates were low and juvenile mortality rates were high. As a result, western populations consisted mainly of larger, older fish. Fish in Interior streams grew more slowly to a smaller maximum size, adult mortality rates were higher and juvenile mortality rates lower than in western streams. As a result, Interior populations consisted mainly of smaller, younger fish. The relationship between body size and ovary mass was similar between regions, but Interior fish allocated a greater proportion of their annual energy budget to reproduction. I also used a foraging model to test the hypothesis that regional differences in drift-feeding opportunities were responsible for faster growth and larger size in arctic grayling in western Alaska and to determine the relative contribution of invertebrate drift density and physical habitat characteristics to regional differences in profitability. The model predicted that drift-feeding would be more profitable in western Alaska and that regional differences in invertebrate drift density and size composition were responsible for this difference. General introduction -- A comparative analysis of the life-history and population dynamics of arctic grayling in western and Interior Alaska -- Can regional differences in the profitability of drift feeding explain regional differences in growth rate and maximum size of arctic grayling? -- General conclusions. Thesis Arctic grayling Arctic Thymallus arcticus 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, 2005 I compared the life-history and population dynamics of arctic grayling Thymallus arcticus in western and Interior Alaska. Fish in western Alaska grew rapidly to a large maximum size, adult mortality rates were low and juvenile mortality rates were high. As a result, western populations consisted mainly of larger, older fish. Fish in Interior streams grew more slowly to a smaller maximum size, adult mortality rates were higher and juvenile mortality rates lower than in western streams. As a result, Interior populations consisted mainly of smaller, younger fish. The relationship between body size and ovary mass was similar between regions, but Interior fish allocated a greater proportion of their annual energy budget to reproduction. I also used a foraging model to test the hypothesis that regional differences in drift-feeding opportunities were responsible for faster growth and larger size in arctic grayling in western Alaska and to determine the relative contribution of invertebrate drift density and physical habitat characteristics to regional differences in profitability. The model predicted that drift-feeding would be more profitable in western Alaska and that regional differences in invertebrate drift density and size composition were responsible for this difference. General introduction -- A comparative analysis of the life-history and population dynamics of arctic grayling in western and Interior Alaska -- Can regional differences in the profitability of drift feeding explain regional differences in growth rate and maximum size of arctic grayling? -- General conclusions. |
format |
Thesis |
author |
Neyme, Jenny Lou |
spellingShingle |
Neyme, Jenny Lou Environmental and evolutionary processes affecting population dynamics and life-history of arctic grayling in western and Interior Alaska |
author_facet |
Neyme, Jenny Lou |
author_sort |
Neyme, Jenny Lou |
title |
Environmental and evolutionary processes affecting population dynamics and life-history of arctic grayling in western and Interior Alaska |
title_short |
Environmental and evolutionary processes affecting population dynamics and life-history of arctic grayling in western and Interior Alaska |
title_full |
Environmental and evolutionary processes affecting population dynamics and life-history of arctic grayling in western and Interior Alaska |
title_fullStr |
Environmental and evolutionary processes affecting population dynamics and life-history of arctic grayling in western and Interior Alaska |
title_full_unstemmed |
Environmental and evolutionary processes affecting population dynamics and life-history of arctic grayling in western and Interior Alaska |
title_sort |
environmental and evolutionary processes affecting population dynamics and life-history of arctic grayling in western and interior alaska |
publishDate |
2005 |
url |
http://hdl.handle.net/11122/6136 |
geographic |
Arctic Fairbanks |
geographic_facet |
Arctic Fairbanks |
genre |
Arctic grayling Arctic Thymallus arcticus Alaska |
genre_facet |
Arctic grayling Arctic Thymallus arcticus Alaska |
op_relation |
http://hdl.handle.net/11122/6136 Fisheries Division |
_version_ |
1766304986179829760 |