Diving behaviour of the critically endangered tope shark Galeorhinus galeus in the Natural Reserve of Bahia San Blas, northern Patagonia

Background: Tope sharks (Galeorhinus galeus) aggregate in large numbers during spring and summer in closed gulfs and bays in northern Patagonia; these locations are considered the main nursery areas for the species. However, little is known about the spatial ecology or diel behaviour of this critica...

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Detalles Bibliográficos
Autores principales: Cuevas, Juan Martín, García, Mirta Lidia, Di Giacomo, Edgardo Ernesto
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Naturales
'yo-yo diving'
Argentina
Marine protected areas
Pop-up satellite archival transmitter
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85079
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85079
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
'yo-yo diving'
Argentina
Marine protected areas
Pop-up satellite archival transmitter
spellingShingle Ciencias Naturales
'yo-yo diving'
Argentina
Marine protected areas
Pop-up satellite archival transmitter
Cuevas, Juan Martín
García, Mirta Lidia
Di Giacomo, Edgardo Ernesto
Diving behaviour of the critically endangered tope shark Galeorhinus galeus in the Natural Reserve of Bahia San Blas, northern Patagonia
topic_facet Ciencias Naturales
'yo-yo diving'
Argentina
Marine protected areas
Pop-up satellite archival transmitter
description Background: Tope sharks (Galeorhinus galeus) aggregate in large numbers during spring and summer in closed gulfs and bays in northern Patagonia; these locations are considered the main nursery areas for the species. However, little is known about the spatial ecology or diel behaviour of this critically endangered species. The aim was to evaluate the short-term diving behaviour and habitat preferences of tope sharks using electronic tagging. Findings: Five female tope sharks, four adult and one sub-adult, were tagged with pop-up satellite archival tags in the Natural Reserve of Bahía San Blas, northern Patagonia, during spring 2011 and 2012. High-resolution archived data were collected for 40 days, including 29 days for two recovered tags. Sharks travelled up to 51.2km after release. Archived data indicated that female tope sharks preferred to remain within 24.5m of the surface and that there were no diel changes in preference. Individuals spent most of the time within 10m of the surface during the day (80%) and at night (83%), and were primarily in water between 17°C and 19°C (day, 75%; night, 70%). Moreover, tope sharks exhibited vertical oscillatory movement ('yo-yo diving'). Maximum vertical speeds and dive depths were recorded at night. Ascents from depth had a greater speed than descents, overall. Conclusions: Female tope sharks were found in shallow coastal areas during November at Bahía San Blas, near the surface at relatively restricted depths and temperatures. Longer tracking periods will be important for describing the species' migratory movements across the south-west Atlantic.
format Articulo
Articulo
author Cuevas, Juan Martín
García, Mirta Lidia
Di Giacomo, Edgardo Ernesto
author_facet Cuevas, Juan Martín
García, Mirta Lidia
Di Giacomo, Edgardo Ernesto
author_sort Cuevas, Juan Martín
title Diving behaviour of the critically endangered tope shark Galeorhinus galeus in the Natural Reserve of Bahia San Blas, northern Patagonia
title_short Diving behaviour of the critically endangered tope shark Galeorhinus galeus in the Natural Reserve of Bahia San Blas, northern Patagonia
title_full Diving behaviour of the critically endangered tope shark Galeorhinus galeus in the Natural Reserve of Bahia San Blas, northern Patagonia
title_fullStr Diving behaviour of the critically endangered tope shark Galeorhinus galeus in the Natural Reserve of Bahia San Blas, northern Patagonia
title_full_unstemmed Diving behaviour of the critically endangered tope shark Galeorhinus galeus in the Natural Reserve of Bahia San Blas, northern Patagonia
title_sort diving behaviour of the critically endangered tope shark galeorhinus galeus in the natural reserve of bahia san blas, northern patagonia
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85079
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AT garciamirtalidia divingbehaviourofthecriticallyendangeredtopesharkgaleorhinusgaleusinthenaturalreserveofbahiasanblasnorthernpatagonia
AT digiacomoedgardoernesto divingbehaviourofthecriticallyendangeredtopesharkgaleorhinusgaleusinthenaturalreserveofbahiasanblasnorthernpatagonia
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