Dietary niche dynamics of breeding seabirds in coastal Newfoundland under shifting prey availability: A stable isotope-based approach
On the Newfoundland coast, an annual pulse of the capelin (Mallotus villosus), provides an excellent opportunity to investigate the influence of varying prey availability on seabird diet. We investigated seabird species- and assemblage-level dietary responses to shifting capelin availability of thre...
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ftunivmanitoba:oai:mspace.lib.umanitoba.ca:1993/33675 2023-06-18T03:35:46+02:00 Dietary niche dynamics of breeding seabirds in coastal Newfoundland under shifting prey availability: A stable isotope-based approach Jenkins, Edward Davoren, Gail (Biological Sciences) Roth, James (Biological Sciences) Ronconi, Robert (Canadian Wildlife Service) Yurkowski, David (Department of Fisheries and Oceans) 2018-12-21T16:33:55Z application/pdf http://hdl.handle.net/1993/33675 eng eng http://hdl.handle.net/1993/33675 open access Stable isotopes Seabirds Newfoundland master thesis 2018 ftunivmanitoba 2023-06-04T17:47:12Z On the Newfoundland coast, an annual pulse of the capelin (Mallotus villosus), provides an excellent opportunity to investigate the influence of varying prey availability on seabird diet. We investigated seabird species- and assemblage-level dietary responses to shifting capelin availability of three breeding auk species (Atlantic puffin Fratercula arctica, razorbill Alca torda, common murre Uria aalge), and Leach’s storm-petrel (Oceanodroma leucorhoa) using stable isotope ratios (δ15N, δ13C). At the species level, trophic position increased, and dietary niche breadth narrowed for auks. We also conducted a controlled feeding experiment on captive adult puffins and murres to calculate diet-tissue discrimination factors (DTDFs), specifically two blood components (i.e., plasma, cellular component). After applying these DTDFs to wild birds, Bayesian mixing model results supported our other study. Using published DTDFs from other studies resulted in different prey proportions, reiterating the importance of species- and tissue-specific diet-tissue discrimination factors when reconstructing dietary proportions of wild seabirds. February 2019 Master Thesis Alca torda Atlantic puffin Common Murre fratercula Fratercula arctica Newfoundland Oceanodroma leucorhoa Razorbill Uria aalge uria MSpace at the University of Manitoba |
institution |
Open Polar |
collection |
MSpace at the University of Manitoba |
op_collection_id |
ftunivmanitoba |
language |
English |
topic |
Stable isotopes Seabirds Newfoundland |
spellingShingle |
Stable isotopes Seabirds Newfoundland Jenkins, Edward Dietary niche dynamics of breeding seabirds in coastal Newfoundland under shifting prey availability: A stable isotope-based approach |
topic_facet |
Stable isotopes Seabirds Newfoundland |
description |
On the Newfoundland coast, an annual pulse of the capelin (Mallotus villosus), provides an excellent opportunity to investigate the influence of varying prey availability on seabird diet. We investigated seabird species- and assemblage-level dietary responses to shifting capelin availability of three breeding auk species (Atlantic puffin Fratercula arctica, razorbill Alca torda, common murre Uria aalge), and Leach’s storm-petrel (Oceanodroma leucorhoa) using stable isotope ratios (δ15N, δ13C). At the species level, trophic position increased, and dietary niche breadth narrowed for auks. We also conducted a controlled feeding experiment on captive adult puffins and murres to calculate diet-tissue discrimination factors (DTDFs), specifically two blood components (i.e., plasma, cellular component). After applying these DTDFs to wild birds, Bayesian mixing model results supported our other study. Using published DTDFs from other studies resulted in different prey proportions, reiterating the importance of species- and tissue-specific diet-tissue discrimination factors when reconstructing dietary proportions of wild seabirds. February 2019 |
author2 |
Davoren, Gail (Biological Sciences) Roth, James (Biological Sciences) Ronconi, Robert (Canadian Wildlife Service) Yurkowski, David (Department of Fisheries and Oceans) |
format |
Master Thesis |
author |
Jenkins, Edward |
author_facet |
Jenkins, Edward |
author_sort |
Jenkins, Edward |
title |
Dietary niche dynamics of breeding seabirds in coastal Newfoundland under shifting prey availability: A stable isotope-based approach |
title_short |
Dietary niche dynamics of breeding seabirds in coastal Newfoundland under shifting prey availability: A stable isotope-based approach |
title_full |
Dietary niche dynamics of breeding seabirds in coastal Newfoundland under shifting prey availability: A stable isotope-based approach |
title_fullStr |
Dietary niche dynamics of breeding seabirds in coastal Newfoundland under shifting prey availability: A stable isotope-based approach |
title_full_unstemmed |
Dietary niche dynamics of breeding seabirds in coastal Newfoundland under shifting prey availability: A stable isotope-based approach |
title_sort |
dietary niche dynamics of breeding seabirds in coastal newfoundland under shifting prey availability: a stable isotope-based approach |
publishDate |
2018 |
url |
http://hdl.handle.net/1993/33675 |
genre |
Alca torda Atlantic puffin Common Murre fratercula Fratercula arctica Newfoundland Oceanodroma leucorhoa Razorbill Uria aalge uria |
genre_facet |
Alca torda Atlantic puffin Common Murre fratercula Fratercula arctica Newfoundland Oceanodroma leucorhoa Razorbill Uria aalge uria |
op_relation |
http://hdl.handle.net/1993/33675 |
op_rights |
open access |
_version_ |
1769010205596581888 |