ASSESSING THE ABUNDANCE OF BASKING SHARKS (CETORHINUS MAXIMUS) IN ATLANTIC CANADIAN WATERS
The Atlantic Canadian population of basking sharks (Cetorhinus maximus) is designated Special Concern by COSEWIC. Little is known about their population size or life history, though they are considered to have long life histories and be inherently unproductive. Estimating population size from aerial...
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2022
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ftdalhouse:oai:DalSpace.library.dal.ca:10222/81570 2023-05-15T15:53:50+02:00 ASSESSING THE ABUNDANCE OF BASKING SHARKS (CETORHINUS MAXIMUS) IN ATLANTIC CANADIAN WATERS Taylor, Scarlett Department of Biology Master of Science Tobey Curtis Dan Ruzzante Sarah Wong Hal Whitehead Aaron MacNeil Heather Bowlby Not Applicable 2022-04-14T16:13:07Z http://hdl.handle.net/10222/81570 en eng http://hdl.handle.net/10222/81570 Abundance Estimation Life History Population Projections Status Ecology Aerial Survey Data Basking shark 2022 ftdalhouse 2022-07-30T23:10:36Z The Atlantic Canadian population of basking sharks (Cetorhinus maximus) is designated Special Concern by COSEWIC. Little is known about their population size or life history, though they are considered to have long life histories and be inherently unproductive. Estimating population size from aerial surveys gave mean abundances ranging from 3,600 to 7,146 in 2007 and from 13,544 to 27,682 in 2016, depending on assumptions. The estimated median intrinsic rate of population increase was 0.0197, and potential population growth became negative if historical bycatch was accounted for. These population growth rates cannot account for the increase in abundance predicted from aerial survey data. Substantial migration into Canadian waters and/or a much more productive life history would be needed in conjunction. These results highlight the need for continued monitoring, potential improvement in methods to estimate abundance, and the development of non-lethal sampling for determining life history parameters. Other/Unknown Material Cetorhinus maximus Dalhousie University: DalSpace Institutional Repository |
institution |
Open Polar |
collection |
Dalhousie University: DalSpace Institutional Repository |
op_collection_id |
ftdalhouse |
language |
English |
topic |
Abundance Estimation Life History Population Projections Status Ecology Aerial Survey Data Basking shark |
spellingShingle |
Abundance Estimation Life History Population Projections Status Ecology Aerial Survey Data Basking shark Taylor, Scarlett ASSESSING THE ABUNDANCE OF BASKING SHARKS (CETORHINUS MAXIMUS) IN ATLANTIC CANADIAN WATERS |
topic_facet |
Abundance Estimation Life History Population Projections Status Ecology Aerial Survey Data Basking shark |
description |
The Atlantic Canadian population of basking sharks (Cetorhinus maximus) is designated Special Concern by COSEWIC. Little is known about their population size or life history, though they are considered to have long life histories and be inherently unproductive. Estimating population size from aerial surveys gave mean abundances ranging from 3,600 to 7,146 in 2007 and from 13,544 to 27,682 in 2016, depending on assumptions. The estimated median intrinsic rate of population increase was 0.0197, and potential population growth became negative if historical bycatch was accounted for. These population growth rates cannot account for the increase in abundance predicted from aerial survey data. Substantial migration into Canadian waters and/or a much more productive life history would be needed in conjunction. These results highlight the need for continued monitoring, potential improvement in methods to estimate abundance, and the development of non-lethal sampling for determining life history parameters. |
author2 |
Department of Biology Master of Science Tobey Curtis Dan Ruzzante Sarah Wong Hal Whitehead Aaron MacNeil Heather Bowlby Not Applicable |
author |
Taylor, Scarlett |
author_facet |
Taylor, Scarlett |
author_sort |
Taylor, Scarlett |
title |
ASSESSING THE ABUNDANCE OF BASKING SHARKS (CETORHINUS MAXIMUS) IN ATLANTIC CANADIAN WATERS |
title_short |
ASSESSING THE ABUNDANCE OF BASKING SHARKS (CETORHINUS MAXIMUS) IN ATLANTIC CANADIAN WATERS |
title_full |
ASSESSING THE ABUNDANCE OF BASKING SHARKS (CETORHINUS MAXIMUS) IN ATLANTIC CANADIAN WATERS |
title_fullStr |
ASSESSING THE ABUNDANCE OF BASKING SHARKS (CETORHINUS MAXIMUS) IN ATLANTIC CANADIAN WATERS |
title_full_unstemmed |
ASSESSING THE ABUNDANCE OF BASKING SHARKS (CETORHINUS MAXIMUS) IN ATLANTIC CANADIAN WATERS |
title_sort |
assessing the abundance of basking sharks (cetorhinus maximus) in atlantic canadian waters |
publishDate |
2022 |
url |
http://hdl.handle.net/10222/81570 |
genre |
Cetorhinus maximus |
genre_facet |
Cetorhinus maximus |
op_relation |
http://hdl.handle.net/10222/81570 |
_version_ |
1766389007913058304 |