First long‐term study of live observations of loggerhead and leatherback turtles in southern Portugal with relevance for conservation
Abstract Most of the information available on loggerhead turtles ( Caretta caretta ) and leatherback turtles ( Dermochelys coriacea ) for the southern coast of Portugal is based on stranding data, and to a less extent on telemetry data, with very little information derived from sightings of live ani...
Published in: | Aquatic Conservation: Marine and Freshwater Ecosystems |
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Online Access: | http://dx.doi.org/10.1002/aqc.3991 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aqc.3991 |
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crwiley:10.1002/aqc.3991 2024-06-02T08:11:33+00:00 First long‐term study of live observations of loggerhead and leatherback turtles in southern Portugal with relevance for conservation Castro, Joana Hughes, Ashley Payne Cid, André Patrício, Ana Rita Laborde, Marina I. Matos, Fábio L. Fundação para a Ciência e a Tecnologia 'la Caixa' Foundation 2023 http://dx.doi.org/10.1002/aqc.3991 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aqc.3991 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Aquatic Conservation: Marine and Freshwater Ecosystems volume 33, issue 10, page 1154-1160 ISSN 1052-7613 1099-0755 journal-article 2023 crwiley https://doi.org/10.1002/aqc.3991 2024-05-03T11:34:09Z Abstract Most of the information available on loggerhead turtles ( Caretta caretta ) and leatherback turtles ( Dermochelys coriacea ) for the southern coast of Portugal is based on stranding data, and to a less extent on telemetry data, with very little information derived from sightings of live animals. This work reports sightings data of loggerhead and leatherback turtles off the south coast of Portugal collected during dedicated surveys on board a research boat, from 2016 to 2022. The sightings data corrected for effort confirm the recurrent presence of loggerhead turtles in the study area, with a higher sightings rate in May and June. Conversely, leatherback turtles were only sporadically observed in some years. This study highlights the importance of the southern waters of Portugal for loggerhead turtles as a recurrent area used by individuals of this species, probably from different origins within the North Atlantic and the Mediterranean, in line with previous studies. The southern coast of Portugal, however, is heavily exploited by fisheries, and the main cause of death among sea turtles is bycatch. The results presented will therefore help inform future management measures aiming to reduce interactions with fisheries (e.g., limiting some fishing gears in the months with more sightings). Since the study area is probably used by loggerhead turtles from different Regional Management Units, the impacts of conservation measures imposed locally may also have beneficial effects at a regional scale. Article in Journal/Newspaper North Atlantic Wiley Online Library Aquatic Conservation: Marine and Freshwater Ecosystems 33 10 1154 1160 |
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English |
description |
Abstract Most of the information available on loggerhead turtles ( Caretta caretta ) and leatherback turtles ( Dermochelys coriacea ) for the southern coast of Portugal is based on stranding data, and to a less extent on telemetry data, with very little information derived from sightings of live animals. This work reports sightings data of loggerhead and leatherback turtles off the south coast of Portugal collected during dedicated surveys on board a research boat, from 2016 to 2022. The sightings data corrected for effort confirm the recurrent presence of loggerhead turtles in the study area, with a higher sightings rate in May and June. Conversely, leatherback turtles were only sporadically observed in some years. This study highlights the importance of the southern waters of Portugal for loggerhead turtles as a recurrent area used by individuals of this species, probably from different origins within the North Atlantic and the Mediterranean, in line with previous studies. The southern coast of Portugal, however, is heavily exploited by fisheries, and the main cause of death among sea turtles is bycatch. The results presented will therefore help inform future management measures aiming to reduce interactions with fisheries (e.g., limiting some fishing gears in the months with more sightings). Since the study area is probably used by loggerhead turtles from different Regional Management Units, the impacts of conservation measures imposed locally may also have beneficial effects at a regional scale. |
author2 |
Fundação para a Ciência e a Tecnologia 'la Caixa' Foundation |
format |
Article in Journal/Newspaper |
author |
Castro, Joana Hughes, Ashley Payne Cid, André Patrício, Ana Rita Laborde, Marina I. Matos, Fábio L. |
spellingShingle |
Castro, Joana Hughes, Ashley Payne Cid, André Patrício, Ana Rita Laborde, Marina I. Matos, Fábio L. First long‐term study of live observations of loggerhead and leatherback turtles in southern Portugal with relevance for conservation |
author_facet |
Castro, Joana Hughes, Ashley Payne Cid, André Patrício, Ana Rita Laborde, Marina I. Matos, Fábio L. |
author_sort |
Castro, Joana |
title |
First long‐term study of live observations of loggerhead and leatherback turtles in southern Portugal with relevance for conservation |
title_short |
First long‐term study of live observations of loggerhead and leatherback turtles in southern Portugal with relevance for conservation |
title_full |
First long‐term study of live observations of loggerhead and leatherback turtles in southern Portugal with relevance for conservation |
title_fullStr |
First long‐term study of live observations of loggerhead and leatherback turtles in southern Portugal with relevance for conservation |
title_full_unstemmed |
First long‐term study of live observations of loggerhead and leatherback turtles in southern Portugal with relevance for conservation |
title_sort |
first long‐term study of live observations of loggerhead and leatherback turtles in southern portugal with relevance for conservation |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/aqc.3991 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aqc.3991 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Aquatic Conservation: Marine and Freshwater Ecosystems volume 33, issue 10, page 1154-1160 ISSN 1052-7613 1099-0755 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/aqc.3991 |
container_title |
Aquatic Conservation: Marine and Freshwater Ecosystems |
container_volume |
33 |
container_issue |
10 |
container_start_page |
1154 |
op_container_end_page |
1160 |
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1800757730974105600 |