Variation in the trophic position of spiny dogfish (Squalus acanthias) in the Northeastern Pacific Ocean: an approach using carbon and nitrogen stable isotopes
Thesis (M.S.) University of Alaska Fairbanks, 2010 "Spiny dogfish (Squalus acanthias) are among the most abundant shark species in the Gulf of Alaska (GOA). An increase in relative biomass of spiny dogfish in 2003 and 2007 inspired interest in this species as a commercial resource. However, ver...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/12767 2023-05-15T17:04:40+02:00 Variation in the trophic position of spiny dogfish (Squalus acanthias) in the Northeastern Pacific Ocean: an approach using carbon and nitrogen stable isotopes Andrews, Alexander George III Foy, Robert J. Hillgruber, Nicola Kruse, Gordon H. Wooller, Matthew J. 2010-12 http://hdl.handle.net/11122/12767 en_US eng http://hdl.handle.net/11122/12767 Graduate Program in Fisheries Spiny dogfish Food chains Ecology Gulf of Alaska Master of Science in Fisheries Thesis ms 2010 ftunivalaska 2023-02-23T21:37:59Z Thesis (M.S.) University of Alaska Fairbanks, 2010 "Spiny dogfish (Squalus acanthias) are among the most abundant shark species in the Gulf of Alaska (GOA). An increase in relative biomass of spiny dogfish in 2003 and 2007 inspired interest in this species as a commercial resource. However, very little was known about the ecology of this species in the GOA. This study investigated the trophic role of spiny dogfish in the GOA, British Columbia (BC), and Washington using stable isotope analysis of carbon and nitrogen. Specifically, we examined the trophic position (TP) of spiny dogfish in relation to length, sex, and geographic region. Weathervane scallops (Patinopecten caurinus) were used as a stable isotopic baseline organism. Spiny dogfish between 52 to 113 cm length had [delta]¹⁵N values that ranged geographically from 10.8°/₀₀ to 15.6°/₀₀; [delta]¹⁵N was linearly related to length. In contrast, lipid-normalized [delta]¹³C, values ranged from -21.28°/₀₀ to -16.88°/₀₀ and were not linearly related to length. In the GOA, TP of spiny dogfish ranged from 3.3 to over 4.1, with Kodiak having the highest TPs for spiny dogfish of a given length. Our results indicated that size-based ontogenetic changes in TP of spiny dogfish are important and should be incorporated into mass-balance, food-web models such as Ecopath"--Leaf iii. Cooperative State Research, Education and Extension Service, U.S. Department of Agriculture Thesis Kodiak Alaska spiny dogfish Squalus acanthias University of Alaska: ScholarWorks@UA Fairbanks Gulf of Alaska Pacific |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Spiny dogfish Food chains Ecology Gulf of Alaska Master of Science in Fisheries |
spellingShingle |
Spiny dogfish Food chains Ecology Gulf of Alaska Master of Science in Fisheries Andrews, Alexander George III Variation in the trophic position of spiny dogfish (Squalus acanthias) in the Northeastern Pacific Ocean: an approach using carbon and nitrogen stable isotopes |
topic_facet |
Spiny dogfish Food chains Ecology Gulf of Alaska Master of Science in Fisheries |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2010 "Spiny dogfish (Squalus acanthias) are among the most abundant shark species in the Gulf of Alaska (GOA). An increase in relative biomass of spiny dogfish in 2003 and 2007 inspired interest in this species as a commercial resource. However, very little was known about the ecology of this species in the GOA. This study investigated the trophic role of spiny dogfish in the GOA, British Columbia (BC), and Washington using stable isotope analysis of carbon and nitrogen. Specifically, we examined the trophic position (TP) of spiny dogfish in relation to length, sex, and geographic region. Weathervane scallops (Patinopecten caurinus) were used as a stable isotopic baseline organism. Spiny dogfish between 52 to 113 cm length had [delta]¹⁵N values that ranged geographically from 10.8°/₀₀ to 15.6°/₀₀; [delta]¹⁵N was linearly related to length. In contrast, lipid-normalized [delta]¹³C, values ranged from -21.28°/₀₀ to -16.88°/₀₀ and were not linearly related to length. In the GOA, TP of spiny dogfish ranged from 3.3 to over 4.1, with Kodiak having the highest TPs for spiny dogfish of a given length. Our results indicated that size-based ontogenetic changes in TP of spiny dogfish are important and should be incorporated into mass-balance, food-web models such as Ecopath"--Leaf iii. Cooperative State Research, Education and Extension Service, U.S. Department of Agriculture |
author2 |
Foy, Robert J. Hillgruber, Nicola Kruse, Gordon H. Wooller, Matthew J. |
format |
Thesis |
author |
Andrews, Alexander George III |
author_facet |
Andrews, Alexander George III |
author_sort |
Andrews, Alexander George III |
title |
Variation in the trophic position of spiny dogfish (Squalus acanthias) in the Northeastern Pacific Ocean: an approach using carbon and nitrogen stable isotopes |
title_short |
Variation in the trophic position of spiny dogfish (Squalus acanthias) in the Northeastern Pacific Ocean: an approach using carbon and nitrogen stable isotopes |
title_full |
Variation in the trophic position of spiny dogfish (Squalus acanthias) in the Northeastern Pacific Ocean: an approach using carbon and nitrogen stable isotopes |
title_fullStr |
Variation in the trophic position of spiny dogfish (Squalus acanthias) in the Northeastern Pacific Ocean: an approach using carbon and nitrogen stable isotopes |
title_full_unstemmed |
Variation in the trophic position of spiny dogfish (Squalus acanthias) in the Northeastern Pacific Ocean: an approach using carbon and nitrogen stable isotopes |
title_sort |
variation in the trophic position of spiny dogfish (squalus acanthias) in the northeastern pacific ocean: an approach using carbon and nitrogen stable isotopes |
publishDate |
2010 |
url |
http://hdl.handle.net/11122/12767 |
geographic |
Fairbanks Gulf of Alaska Pacific |
geographic_facet |
Fairbanks Gulf of Alaska Pacific |
genre |
Kodiak Alaska spiny dogfish Squalus acanthias |
genre_facet |
Kodiak Alaska spiny dogfish Squalus acanthias |
op_relation |
http://hdl.handle.net/11122/12767 Graduate Program in Fisheries |
_version_ |
1766058985333456896 |