Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018)
Interactions between cetaceans and the purse seine fishery in coastal waters of mainland Portugal were investigated using onboard observations over a period of 15 years (2003-2018). In 10% of the fishing sets, there were interactions with one of three species of cetaceans: common dolphin (Delphinus...
Published in: | Aquatic Conservation: Marine and Freshwater Ecosystems |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Wiley
2022
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Online Access: | http://hdl.handle.net/10400.1/18314 https://doi.org/10.1002/aqc.3828 |
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ftunivalgarve:oai:sapientia.ualg.pt:10400.1/18314 2023-05-15T16:33:30+02:00 Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018) Dias, Inês C. Marçalo, Ana Feijó, Diana Domingos, Isabel Silva, Alexandra A. 2022 http://hdl.handle.net/10400.1/18314 https://doi.org/10.1002/aqc.3828 eng eng Wiley NAT/PT/00038 info:eu-repo/grantAgreement/FCT/FARH/SFRH%2FBPD%2F64889%2F2009/PT info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04292%2F2020/PT info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT MAR-01.04.02-FEAMP-0009 1052-7613 http://hdl.handle.net/10400.1/18314 doi:10.1002/aqc.3828 restrictedAccess Accidental capture Cetaceans Common dolphin Delphinus delphis Purse seine fishery article 2022 ftunivalgarve https://doi.org/10.1002/aqc.3828 2022-10-05T00:01:32Z Interactions between cetaceans and the purse seine fishery in coastal waters of mainland Portugal were investigated using onboard observations over a period of 15 years (2003-2018). In 10% of the fishing sets, there were interactions with one of three species of cetaceans: common dolphin (Delphinus delphis), bottlenose dolphin (Tursiops truncatus), and harbour porpoise (Phocoena phocoena). The common dolphin was the most frequently observed species, occurring in 89% of all interaction events, and the only species with observed mortality. Therefore, this study focused only on the interactions with common dolphins. A generalized additive model (GAM) was applied to observer data to investigate how the fishing activity and the abundance of small pelagic fish influenced the probability of occurrence of interactions between the common dolphin and the purse seine fishery between 2003 and 2018. The results revealed significant annual and geographic variation in the occurrence of interactions, and a significant influence of fishing effort and catch per unit effort of sardine (Sardina pilchardus). A second GAM in a hurdle model was used to model the number of common dolphins that interacted with the fishing activity as a function of fishing seasonality and the local abundance of pelagic fish. There was a significant effect of the seasonality of the fishing activity and catch per unit effort of sardine and chub mackerel (Scomber colias) on the number of common dolphins interacting with the fishery. The results of this study suggest that the probability of interactions and the number of common dolphins interacting with the fishery were affected by the local abundance of sardine and chub mackerel. As the common dolphin population appears to be increasing in the study area, the risk of by-catch also increases, thus the monitoring of the Portuguese purse seine fishery is important to inform the implementation of management plans, and also as a response to global efforts for sustainable fisheries and marine mammal conservation. ... Article in Journal/Newspaper Harbour porpoise Phocoena phocoena Universidade do Algarve: Sapienta Gam ENVELOPE(-57.955,-57.955,-61.923,-61.923) Aquatic Conservation: Marine and Freshwater Ecosystems 32 8 1351 1364 |
institution |
Open Polar |
collection |
Universidade do Algarve: Sapienta |
op_collection_id |
ftunivalgarve |
language |
English |
topic |
Accidental capture Cetaceans Common dolphin Delphinus delphis Purse seine fishery |
spellingShingle |
Accidental capture Cetaceans Common dolphin Delphinus delphis Purse seine fishery Dias, Inês C. Marçalo, Ana Feijó, Diana Domingos, Isabel Silva, Alexandra A. Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018) |
topic_facet |
Accidental capture Cetaceans Common dolphin Delphinus delphis Purse seine fishery |
description |
Interactions between cetaceans and the purse seine fishery in coastal waters of mainland Portugal were investigated using onboard observations over a period of 15 years (2003-2018). In 10% of the fishing sets, there were interactions with one of three species of cetaceans: common dolphin (Delphinus delphis), bottlenose dolphin (Tursiops truncatus), and harbour porpoise (Phocoena phocoena). The common dolphin was the most frequently observed species, occurring in 89% of all interaction events, and the only species with observed mortality. Therefore, this study focused only on the interactions with common dolphins. A generalized additive model (GAM) was applied to observer data to investigate how the fishing activity and the abundance of small pelagic fish influenced the probability of occurrence of interactions between the common dolphin and the purse seine fishery between 2003 and 2018. The results revealed significant annual and geographic variation in the occurrence of interactions, and a significant influence of fishing effort and catch per unit effort of sardine (Sardina pilchardus). A second GAM in a hurdle model was used to model the number of common dolphins that interacted with the fishing activity as a function of fishing seasonality and the local abundance of pelagic fish. There was a significant effect of the seasonality of the fishing activity and catch per unit effort of sardine and chub mackerel (Scomber colias) on the number of common dolphins interacting with the fishery. The results of this study suggest that the probability of interactions and the number of common dolphins interacting with the fishery were affected by the local abundance of sardine and chub mackerel. As the common dolphin population appears to be increasing in the study area, the risk of by-catch also increases, thus the monitoring of the Portuguese purse seine fishery is important to inform the implementation of management plans, and also as a response to global efforts for sustainable fisheries and marine mammal conservation. ... |
format |
Article in Journal/Newspaper |
author |
Dias, Inês C. Marçalo, Ana Feijó, Diana Domingos, Isabel Silva, Alexandra A. |
author_facet |
Dias, Inês C. Marçalo, Ana Feijó, Diana Domingos, Isabel Silva, Alexandra A. |
author_sort |
Dias, Inês C. |
title |
Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018) |
title_short |
Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018) |
title_full |
Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018) |
title_fullStr |
Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018) |
title_full_unstemmed |
Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018) |
title_sort |
interactions between the common dolphin, delphinus delphis, and the portuguese purse seine fishery over a period of 15 years (2003–2018) |
publisher |
Wiley |
publishDate |
2022 |
url |
http://hdl.handle.net/10400.1/18314 https://doi.org/10.1002/aqc.3828 |
long_lat |
ENVELOPE(-57.955,-57.955,-61.923,-61.923) |
geographic |
Gam |
geographic_facet |
Gam |
genre |
Harbour porpoise Phocoena phocoena |
genre_facet |
Harbour porpoise Phocoena phocoena |
op_relation |
NAT/PT/00038 info:eu-repo/grantAgreement/FCT/FARH/SFRH%2FBPD%2F64889%2F2009/PT info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04292%2F2020/PT info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT MAR-01.04.02-FEAMP-0009 1052-7613 http://hdl.handle.net/10400.1/18314 doi:10.1002/aqc.3828 |
op_rights |
restrictedAccess |
op_doi |
https://doi.org/10.1002/aqc.3828 |
container_title |
Aquatic Conservation: Marine and Freshwater Ecosystems |
container_volume |
32 |
container_issue |
8 |
container_start_page |
1351 |
op_container_end_page |
1364 |
_version_ |
1766023188258488320 |