Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties
The deep-sea lantern shark Etmopterus spinax occurs in the northeast Atlantic on or near the bottoms of the outer continental shelves and slopes, and is regularly captured as bycatch in deep-water commercial fisheries. Given the lack of knowledge on the impacts of fisheries on this species, a demogr...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | http://hdl.handle.net/10400.1/8869 https://doi.org/10.1016/j.dsr2.2014.01.012 |
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ftunivalgarve:oai:sapientia.ualg.pt:10400.1/8869 2023-05-15T17:41:35+02:00 Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties Coelho, Rui Alpizar-Jara, Russell Erzini, Karim 2015-05 http://hdl.handle.net/10400.1/8869 https://doi.org/10.1016/j.dsr2.2014.01.012 eng eng WOS:000355055400007 0967-0645 AUT: KER00534; RMS01092; http://hdl.handle.net/10400.1/8869 http://dx.doi.org/10.1016/j.dsr2.2014.01.012 openAccess Bottom trawling Deep-sea sharks Deep-sea fisheries Demographic analysis Fishing mortality Population dynamics article 2015 ftunivalgarve https://doi.org/10.1016/j.dsr2.2014.01.012 2022-05-30T08:47:22Z The deep-sea lantern shark Etmopterus spinax occurs in the northeast Atlantic on or near the bottoms of the outer continental shelves and slopes, and is regularly captured as bycatch in deep-water commercial fisheries. Given the lack of knowledge on the impacts of fisheries on this species, a demographic analysis using age-based Leslie matrices was carried out. Given the uncertainties in the mortality estimates and in the available life history parameters, several different scenarios, some incorporating stochasticity in the life history parameters (using Monte Carlo simulation), were analyzed. If only natural mortality were considered, even after introducing uncertainties in all parameters, the estimated population growth rate (A) suggested an increasing population. However, if fishing mortality from trawl fisheries is considered, the estimates of A either indicated increasing or declining populations. In these latter cases, the uncertainties in the species reproductive cycle seemed to be particularly relevant, as a 2-year reproductive cycle indicated a stable population, while a longer (3-year cycle) indicated a declining population. The estimated matrix elasticities were in general higher for the survivorship parameters of the younger age classes and tended to decrease for the older ages. This highlights the susceptibility of this deep-sea squaloid to increasing fishing mortality, emphasizing that even though this is a small-sized species, it shows population dynamics patterns more typical of the larger-sized and in general more vulnerable species. (C) 2014 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Northeast Atlantic Universidade do Algarve: Sapienta Deep Sea Research Part II: Topical Studies in Oceanography 115 64 72 |
institution |
Open Polar |
collection |
Universidade do Algarve: Sapienta |
op_collection_id |
ftunivalgarve |
language |
English |
topic |
Bottom trawling Deep-sea sharks Deep-sea fisheries Demographic analysis Fishing mortality Population dynamics |
spellingShingle |
Bottom trawling Deep-sea sharks Deep-sea fisheries Demographic analysis Fishing mortality Population dynamics Coelho, Rui Alpizar-Jara, Russell Erzini, Karim Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties |
topic_facet |
Bottom trawling Deep-sea sharks Deep-sea fisheries Demographic analysis Fishing mortality Population dynamics |
description |
The deep-sea lantern shark Etmopterus spinax occurs in the northeast Atlantic on or near the bottoms of the outer continental shelves and slopes, and is regularly captured as bycatch in deep-water commercial fisheries. Given the lack of knowledge on the impacts of fisheries on this species, a demographic analysis using age-based Leslie matrices was carried out. Given the uncertainties in the mortality estimates and in the available life history parameters, several different scenarios, some incorporating stochasticity in the life history parameters (using Monte Carlo simulation), were analyzed. If only natural mortality were considered, even after introducing uncertainties in all parameters, the estimated population growth rate (A) suggested an increasing population. However, if fishing mortality from trawl fisheries is considered, the estimates of A either indicated increasing or declining populations. In these latter cases, the uncertainties in the species reproductive cycle seemed to be particularly relevant, as a 2-year reproductive cycle indicated a stable population, while a longer (3-year cycle) indicated a declining population. The estimated matrix elasticities were in general higher for the survivorship parameters of the younger age classes and tended to decrease for the older ages. This highlights the susceptibility of this deep-sea squaloid to increasing fishing mortality, emphasizing that even though this is a small-sized species, it shows population dynamics patterns more typical of the larger-sized and in general more vulnerable species. (C) 2014 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Coelho, Rui Alpizar-Jara, Russell Erzini, Karim |
author_facet |
Coelho, Rui Alpizar-Jara, Russell Erzini, Karim |
author_sort |
Coelho, Rui |
title |
Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties |
title_short |
Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties |
title_full |
Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties |
title_fullStr |
Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties |
title_full_unstemmed |
Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties |
title_sort |
demography of a deep-sea lantern shark (etmopterus spinax) caught in trawl fisheries of the northeastern atlantic: application of leslie matrices with incorporated uncertainties |
publishDate |
2015 |
url |
http://hdl.handle.net/10400.1/8869 https://doi.org/10.1016/j.dsr2.2014.01.012 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
WOS:000355055400007 0967-0645 AUT: KER00534; RMS01092; http://hdl.handle.net/10400.1/8869 http://dx.doi.org/10.1016/j.dsr2.2014.01.012 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.dsr2.2014.01.012 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
115 |
container_start_page |
64 |
op_container_end_page |
72 |
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1766143212768985088 |