Arrowtooth flounder Atheresthes stomias diet and prey consumption near Kodiak Island, Alaska
Thesis (M.S.) University of Alaska Fairbanks, 2006 The arrowtooth flounder Atheresthes stomias (ATF) population in the Gulf of Alaska has increased dramatically over the past 25 years and the resulting ecosystem impacts are unclear. Arrowtooth flounder diet and prey consumption was studied to more a...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/5882 2023-05-15T17:04:36+02:00 Arrowtooth flounder Atheresthes stomias diet and prey consumption near Kodiak Island, Alaska Knoth, Brian Anthony 2006-12 http://hdl.handle.net/11122/5882 en_US eng http://hdl.handle.net/11122/5882 Program in Fisheries Thesis ms 2006 ftunivalaska 2023-02-23T21:36:31Z Thesis (M.S.) University of Alaska Fairbanks, 2006 The arrowtooth flounder Atheresthes stomias (ATF) population in the Gulf of Alaska has increased dramatically over the past 25 years and the resulting ecosystem impacts are unclear. Arrowtooth flounder diet and prey consumption was studied to more accurately assess the predator-prey relationships of this key predator near Kodiak Island, Alaska. Temporal and ontogenetic diet trends were quantified from the analysis of 742 ATF stomachs sampled from annual bottom trawl surveys conducted in May and August from 2002 to 2004. Several significant dietary trends were found, most notably: 1) euphausiids decreased in dietary importance from May to August whereas the importance of capelin Mallotus villosus increased and 2) smaller ATF consumed more capelin and larger ATF consumed more walleye pollock Theragra chalcogramma and Pacific sand lance Ammodytes hexapterus. A bioenergetics model was used to estimate ATF prey consumption. Within the study area, the ATF population was dominated by large individuals ([great than or equal to] 50 cm total length) that accounted for> 75 % of the population's total prey biomass consumption. Arrowtooth flounder were significant predators and consumed an estimated 339 t of fish prey including Pacific sand lance and walleye pollock and 222 t of invertebrate prey such as euphausiids and shrimps. Thesis Kodiak Theragra chalcogramma Alaska University of Alaska: ScholarWorks@UA Fairbanks Gulf of Alaska Pacific |
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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, 2006 The arrowtooth flounder Atheresthes stomias (ATF) population in the Gulf of Alaska has increased dramatically over the past 25 years and the resulting ecosystem impacts are unclear. Arrowtooth flounder diet and prey consumption was studied to more accurately assess the predator-prey relationships of this key predator near Kodiak Island, Alaska. Temporal and ontogenetic diet trends were quantified from the analysis of 742 ATF stomachs sampled from annual bottom trawl surveys conducted in May and August from 2002 to 2004. Several significant dietary trends were found, most notably: 1) euphausiids decreased in dietary importance from May to August whereas the importance of capelin Mallotus villosus increased and 2) smaller ATF consumed more capelin and larger ATF consumed more walleye pollock Theragra chalcogramma and Pacific sand lance Ammodytes hexapterus. A bioenergetics model was used to estimate ATF prey consumption. Within the study area, the ATF population was dominated by large individuals ([great than or equal to] 50 cm total length) that accounted for> 75 % of the population's total prey biomass consumption. Arrowtooth flounder were significant predators and consumed an estimated 339 t of fish prey including Pacific sand lance and walleye pollock and 222 t of invertebrate prey such as euphausiids and shrimps. |
format |
Thesis |
author |
Knoth, Brian Anthony |
spellingShingle |
Knoth, Brian Anthony Arrowtooth flounder Atheresthes stomias diet and prey consumption near Kodiak Island, Alaska |
author_facet |
Knoth, Brian Anthony |
author_sort |
Knoth, Brian Anthony |
title |
Arrowtooth flounder Atheresthes stomias diet and prey consumption near Kodiak Island, Alaska |
title_short |
Arrowtooth flounder Atheresthes stomias diet and prey consumption near Kodiak Island, Alaska |
title_full |
Arrowtooth flounder Atheresthes stomias diet and prey consumption near Kodiak Island, Alaska |
title_fullStr |
Arrowtooth flounder Atheresthes stomias diet and prey consumption near Kodiak Island, Alaska |
title_full_unstemmed |
Arrowtooth flounder Atheresthes stomias diet and prey consumption near Kodiak Island, Alaska |
title_sort |
arrowtooth flounder atheresthes stomias diet and prey consumption near kodiak island, alaska |
publishDate |
2006 |
url |
http://hdl.handle.net/11122/5882 |
geographic |
Fairbanks Gulf of Alaska Pacific |
geographic_facet |
Fairbanks Gulf of Alaska Pacific |
genre |
Kodiak Theragra chalcogramma Alaska |
genre_facet |
Kodiak Theragra chalcogramma Alaska |
op_relation |
http://hdl.handle.net/11122/5882 Program in Fisheries |
_version_ |
1766058905969885184 |