Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.13/3379 |
Resumo: | The loggerhead sea turtle Caretta caretta is a vulnerable migratory species that spends its frst years of life in the open sea. During this developmental phase, loggerheads can be found foraging in the epipelagic zone of the waters surrounding the Madeira Archipelago, providing a rare opportunity to gather information on the ecology of its oceanic developmental stage. In this study, we characterized the isotopic niche of these juveniles, using stable isotope analysis. We assessed two groups of turtles, turtles captured alive (n=24) and turtles captured as bycatch on local longlines (n=12), and explored whether animals caught in the local fshing gear represented a random sample of the population, or whether there is some evidence for a specialized foraging behaviour. We found that turtle bycatch had a signifcantly higher mean stable nitrogen isotope value in whole blood (δ15N=8.5±0.6‰ SD) compared to the group of turtles captured alive in the same period (δ15N=7.6±0.5‰ SD), indicating that they had a diferent diet. While there was a tendency for turtle bycatch to be slightly larger, we found no efect of body size on δ15N values. We propose a distinct foraging behaviour strategy hypothesis, with a group of turtles being more susceptible to interactions with fsheries and thus having a higher mortality risk, which should motivate the implementation of existing guidelines to reduce sea turtle bycatch. |
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Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtlesLoggerhead sea turtle Caretta carettaCaretta carettaTrophic diferencesMadeira Archipelago (Portugal).Faculdade de Ciências da VidaThe loggerhead sea turtle Caretta caretta is a vulnerable migratory species that spends its frst years of life in the open sea. During this developmental phase, loggerheads can be found foraging in the epipelagic zone of the waters surrounding the Madeira Archipelago, providing a rare opportunity to gather information on the ecology of its oceanic developmental stage. In this study, we characterized the isotopic niche of these juveniles, using stable isotope analysis. We assessed two groups of turtles, turtles captured alive (n=24) and turtles captured as bycatch on local longlines (n=12), and explored whether animals caught in the local fshing gear represented a random sample of the population, or whether there is some evidence for a specialized foraging behaviour. We found that turtle bycatch had a signifcantly higher mean stable nitrogen isotope value in whole blood (δ15N=8.5±0.6‰ SD) compared to the group of turtles captured alive in the same period (δ15N=7.6±0.5‰ SD), indicating that they had a diferent diet. While there was a tendency for turtle bycatch to be slightly larger, we found no efect of body size on δ15N values. We propose a distinct foraging behaviour strategy hypothesis, with a group of turtles being more susceptible to interactions with fsheries and thus having a higher mortality risk, which should motivate the implementation of existing guidelines to reduce sea turtle bycatch.SpringerDigitUMaRaposo, CheilaPatrício, Ana RitaCatry, PauloDellinger, ThomasGranadeiro, José P.2021-05-10T09:10:33Z20192019-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.13/3379engRaposo, C., Patrício, A. R., Catry, P., Dellinger, T., & Granadeiro, J. P. (2019). Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles. Marine Biology, 166(3), 29. 10.1007/s00227-019-3466-810.1007/s00227-019-3466-8info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-19T05:34:48Zoai:digituma.uma.pt:10400.13/3379Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:06:25.899705Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles |
title |
Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles |
spellingShingle |
Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles Raposo, Cheila Loggerhead sea turtle Caretta caretta Caretta caretta Trophic diferences Madeira Archipelago (Portugal) . Faculdade de Ciências da Vida |
title_short |
Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles |
title_full |
Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles |
title_fullStr |
Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles |
title_full_unstemmed |
Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles |
title_sort |
Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles |
author |
Raposo, Cheila |
author_facet |
Raposo, Cheila Patrício, Ana Rita Catry, Paulo Dellinger, Thomas Granadeiro, José P. |
author_role |
author |
author2 |
Patrício, Ana Rita Catry, Paulo Dellinger, Thomas Granadeiro, José P. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
DigitUMa |
dc.contributor.author.fl_str_mv |
Raposo, Cheila Patrício, Ana Rita Catry, Paulo Dellinger, Thomas Granadeiro, José P. |
dc.subject.por.fl_str_mv |
Loggerhead sea turtle Caretta caretta Caretta caretta Trophic diferences Madeira Archipelago (Portugal) . Faculdade de Ciências da Vida |
topic |
Loggerhead sea turtle Caretta caretta Caretta caretta Trophic diferences Madeira Archipelago (Portugal) . Faculdade de Ciências da Vida |
description |
The loggerhead sea turtle Caretta caretta is a vulnerable migratory species that spends its frst years of life in the open sea. During this developmental phase, loggerheads can be found foraging in the epipelagic zone of the waters surrounding the Madeira Archipelago, providing a rare opportunity to gather information on the ecology of its oceanic developmental stage. In this study, we characterized the isotopic niche of these juveniles, using stable isotope analysis. We assessed two groups of turtles, turtles captured alive (n=24) and turtles captured as bycatch on local longlines (n=12), and explored whether animals caught in the local fshing gear represented a random sample of the population, or whether there is some evidence for a specialized foraging behaviour. We found that turtle bycatch had a signifcantly higher mean stable nitrogen isotope value in whole blood (δ15N=8.5±0.6‰ SD) compared to the group of turtles captured alive in the same period (δ15N=7.6±0.5‰ SD), indicating that they had a diferent diet. While there was a tendency for turtle bycatch to be slightly larger, we found no efect of body size on δ15N values. We propose a distinct foraging behaviour strategy hypothesis, with a group of turtles being more susceptible to interactions with fsheries and thus having a higher mortality risk, which should motivate the implementation of existing guidelines to reduce sea turtle bycatch. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019 2019-01-01T00:00:00Z 2021-05-10T09:10:33Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.13/3379 |
url |
http://hdl.handle.net/10400.13/3379 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Raposo, C., Patrício, A. R., Catry, P., Dellinger, T., & Granadeiro, J. P. (2019). Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles. Marine Biology, 166(3), 29. 10.1007/s00227-019-3466-8 10.1007/s00227-019-3466-8 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Springer |
publisher.none.fl_str_mv |
Springer |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1817552611690151936 |