Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications

Autores
Gómez de Segura, A.; Tomás, J.; Pedraza, Susana Noemi; Crespo, Enrique Alberto; Raga, Juan Antonio
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
During 2 years (2001–2003), we performed seasonal aerial surveys in the central Spanish Mediterranean following the transect line methodology in order to determine the abundance and distribution patterns of loggerhead turtles Caretta caretta. We surveyed a total of 16 700 km, accounting for 770 turtle sightings. Loggerhead turtles were present with high abundance all year round. No seasonal differences in abundance were found, except in spring 2001, where the density of turtles was higher than in the other seasons. Our results show that the Western Mediterranean is not a ‘summer’ feeding area as proposed previously, as a high number of turtles are present throughout the year. The average surface density of turtles in the whole study area was 0.21 turtles km 2 [95% confidence interval (CI): 0.17–0.25], and the mean abundance was 6653 turtles (95% CI: 5514–8027). The data relate to the number of turtles on the surface only, as diving turtles escape observation. Correcting our estimations of diving behaviour data in the area, the absolute abundance was 18 954 turtles (95% CI: 6679–53 786). Bearing in mind that around 25 000 loggerheads are caught per year in the Spanish Mediterranean, our results indicate that accidental captures seem to be a significant threat for this species, and conservation measures have to be implemented to avoid a non- sustainable situation.
Fil: Gómez de Segura, A.. Cavanilles Institute of Biodiversity and Evolutionary Biology. Marine Zoology Unit; España
Fil: Tomás, J.. Cavanilles Institute of Biodiversity and Evolutionary Biology. Marine Zoology Unit; España. L’Oceanográfic; España
Fil: Pedraza, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Raga, Juan Antonio. Cavanilles Institute of Biodiversity and Evolutionary Biology. Marine Zoology Unit; España
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/16787
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implicationsGómez de Segura, A.Tomás, J.Pedraza, Susana NoemiCrespo, Enrique AlbertoRaga, Juan Antoniohttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1During 2 years (2001–2003), we performed seasonal aerial surveys in the central Spanish Mediterranean following the transect line methodology in order to determine the abundance and distribution patterns of loggerhead turtles Caretta caretta. We surveyed a total of 16 700 km, accounting for 770 turtle sightings. Loggerhead turtles were present with high abundance all year round. No seasonal differences in abundance were found, except in spring 2001, where the density of turtles was higher than in the other seasons. Our results show that the Western Mediterranean is not a ‘summer’ feeding area as proposed previously, as a high number of turtles are present throughout the year. The average surface density of turtles in the whole study area was 0.21 turtles km 2 [95% confidence interval (CI): 0.17–0.25], and the mean abundance was 6653 turtles (95% CI: 5514–8027). The data relate to the number of turtles on the surface only, as diving turtles escape observation. Correcting our estimations of diving behaviour data in the area, the absolute abundance was 18 954 turtles (95% CI: 6679–53 786). Bearing in mind that around 25 000 loggerheads are caught per year in the Spanish Mediterranean, our results indicate that accidental captures seem to be a significant threat for this species, and conservation measures have to be implemented to avoid a non- sustainable situation.Fil: Gómez de Segura, A.. Cavanilles Institute of Biodiversity and Evolutionary Biology. Marine Zoology Unit; EspañaFil: Tomás, J.. Cavanilles Institute of Biodiversity and Evolutionary Biology. Marine Zoology Unit; España. L’Oceanográfic; EspañaFil: Pedraza, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Raga, Juan Antonio. Cavanilles Institute of Biodiversity and Evolutionary Biology. Marine Zoology Unit; EspañaWiley Blackwell Publishing, Inc2006-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/16787Gómez de Segura, A.; Tomás, J.; Pedraza, Susana Noemi; Crespo, Enrique Alberto; Raga, Juan Antonio; Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications; Wiley Blackwell Publishing, Inc; Animal Conservation; 9; 2; 12-2006; 199-2061367-9430enginfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1469-1795.2005.00014.xinfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/j.1469-1795.2005.00014.x/abstractinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:40:02Zoai:ri.conicet.gov.ar:11336/16787instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 11:40:02.921CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications
title Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications
spellingShingle Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications
Gómez de Segura, A.
title_short Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications
title_full Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications
title_fullStr Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications
title_full_unstemmed Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications
title_sort Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications
dc.creator.none.fl_str_mv Gómez de Segura, A.
Tomás, J.
Pedraza, Susana Noemi
Crespo, Enrique Alberto
Raga, Juan Antonio
author Gómez de Segura, A.
author_facet Gómez de Segura, A.
Tomás, J.
Pedraza, Susana Noemi
Crespo, Enrique Alberto
Raga, Juan Antonio
author_role author
author2 Tomás, J.
Pedraza, Susana Noemi
Crespo, Enrique Alberto
Raga, Juan Antonio
author2_role author
author
author
author
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv During 2 years (2001–2003), we performed seasonal aerial surveys in the central Spanish Mediterranean following the transect line methodology in order to determine the abundance and distribution patterns of loggerhead turtles Caretta caretta. We surveyed a total of 16 700 km, accounting for 770 turtle sightings. Loggerhead turtles were present with high abundance all year round. No seasonal differences in abundance were found, except in spring 2001, where the density of turtles was higher than in the other seasons. Our results show that the Western Mediterranean is not a ‘summer’ feeding area as proposed previously, as a high number of turtles are present throughout the year. The average surface density of turtles in the whole study area was 0.21 turtles km 2 [95% confidence interval (CI): 0.17–0.25], and the mean abundance was 6653 turtles (95% CI: 5514–8027). The data relate to the number of turtles on the surface only, as diving turtles escape observation. Correcting our estimations of diving behaviour data in the area, the absolute abundance was 18 954 turtles (95% CI: 6679–53 786). Bearing in mind that around 25 000 loggerheads are caught per year in the Spanish Mediterranean, our results indicate that accidental captures seem to be a significant threat for this species, and conservation measures have to be implemented to avoid a non- sustainable situation.
Fil: Gómez de Segura, A.. Cavanilles Institute of Biodiversity and Evolutionary Biology. Marine Zoology Unit; España
Fil: Tomás, J.. Cavanilles Institute of Biodiversity and Evolutionary Biology. Marine Zoology Unit; España. L’Oceanográfic; España
Fil: Pedraza, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Raga, Juan Antonio. Cavanilles Institute of Biodiversity and Evolutionary Biology. Marine Zoology Unit; España
description During 2 years (2001–2003), we performed seasonal aerial surveys in the central Spanish Mediterranean following the transect line methodology in order to determine the abundance and distribution patterns of loggerhead turtles Caretta caretta. We surveyed a total of 16 700 km, accounting for 770 turtle sightings. Loggerhead turtles were present with high abundance all year round. No seasonal differences in abundance were found, except in spring 2001, where the density of turtles was higher than in the other seasons. Our results show that the Western Mediterranean is not a ‘summer’ feeding area as proposed previously, as a high number of turtles are present throughout the year. The average surface density of turtles in the whole study area was 0.21 turtles km 2 [95% confidence interval (CI): 0.17–0.25], and the mean abundance was 6653 turtles (95% CI: 5514–8027). The data relate to the number of turtles on the surface only, as diving turtles escape observation. Correcting our estimations of diving behaviour data in the area, the absolute abundance was 18 954 turtles (95% CI: 6679–53 786). Bearing in mind that around 25 000 loggerheads are caught per year in the Spanish Mediterranean, our results indicate that accidental captures seem to be a significant threat for this species, and conservation measures have to be implemented to avoid a non- sustainable situation.
publishDate 2006
dc.date.none.fl_str_mv 2006-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/16787
Gómez de Segura, A.; Tomás, J.; Pedraza, Susana Noemi; Crespo, Enrique Alberto; Raga, Juan Antonio; Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications; Wiley Blackwell Publishing, Inc; Animal Conservation; 9; 2; 12-2006; 199-206
1367-9430
url http://hdl.handle.net/11336/16787
identifier_str_mv Gómez de Segura, A.; Tomás, J.; Pedraza, Susana Noemi; Crespo, Enrique Alberto; Raga, Juan Antonio; Abundance and distribution of the endangered loggerhead turtle in Spanish Mediterranean waters and the conservation implications; Wiley Blackwell Publishing, Inc; Animal Conservation; 9; 2; 12-2006; 199-206
1367-9430
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1469-1795.2005.00014.x
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/j.1469-1795.2005.00014.x/abstract
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.982451

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