Feeding habits of two deep-sea sharks from central-northern Chile: hooktooth dogfish Aculeola nigra (Etmopteridae) and dusky catshark Bythalaelurus canescens (Scyliorhinidae)

Feeding habits of 381 specimens of Aculeola nigra and 513 specimens of Bythalaelurus canescens were studied. In 121 stomachs of A. nigra and 312 of B. canescens preys were found. Individuals were collected as by-catch from the deep-sea crustacean fishery, between 25º20'S and 35º43'S; from...

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Autores principales:	Acuña,Enzo, Villarroel,Juan Carlos
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2010
Materias:	By-catch pelagic benthic trophic niche breadth trophic overlap
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000400016
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spelling	oai:scielo:S0718-195720100004000162011-04-28Feeding habits of two deep-sea sharks from central-northern Chile: hooktooth dogfish Aculeola nigra (Etmopteridae) and dusky catshark Bythalaelurus canescens (Scyliorhinidae)Acuña,EnzoVillarroel,Juan Carlos By-catch pelagic benthic trophic niche breadth trophic overlap Feeding habits of 381 specimens of Aculeola nigra and 513 specimens of Bythalaelurus canescens were studied. In 121 stomachs of A. nigra and 312 of B. canescens preys were found. Individuals were collected as by-catch from the deep-sea crustacean fishery, between 25º20'S and 35º43'S; from January 1997 to July 2000 off the northern-central Chilean coast. The most important prey by index of relative importance and by frequency of occurrence in A. nigra was the benthic deep-sea shrimp Heterocarpus reedi; while by number the euphausiid Euphausia mucronata and by weight the common hake Merluccius gayi were the most important. The deep-sea shrimp H. reedi was also the most important prey of B. canescens, for all feeding indices used. Significant differences were found in the habitat where these predators consume their prey, A. nigra eating more on pelagic prey; whereas B. canescens feeds more on benthic prey. A. nigra showed a higher trophic niche breadth, because they predate more on benthic, pelagic and mesopelagic resources; whereas B. canescens feeds primarily on benthic prey. The diet of both species significantly overlapped, suggesting a high competition between them.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.45 suppl.1 20102010-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000400016en10.4067/S0718-19572010000400016
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	By-catch pelagic benthic trophic niche breadth trophic overlap
spellingShingle	By-catch pelagic benthic trophic niche breadth trophic overlap Acuña,Enzo Villarroel,Juan Carlos Feeding habits of two deep-sea sharks from central-northern Chile: hooktooth dogfish Aculeola nigra (Etmopteridae) and dusky catshark Bythalaelurus canescens (Scyliorhinidae)
description	Feeding habits of 381 specimens of Aculeola nigra and 513 specimens of Bythalaelurus canescens were studied. In 121 stomachs of A. nigra and 312 of B. canescens preys were found. Individuals were collected as by-catch from the deep-sea crustacean fishery, between 25º20'S and 35º43'S; from January 1997 to July 2000 off the northern-central Chilean coast. The most important prey by index of relative importance and by frequency of occurrence in A. nigra was the benthic deep-sea shrimp Heterocarpus reedi; while by number the euphausiid Euphausia mucronata and by weight the common hake Merluccius gayi were the most important. The deep-sea shrimp H. reedi was also the most important prey of B. canescens, for all feeding indices used. Significant differences were found in the habitat where these predators consume their prey, A. nigra eating more on pelagic prey; whereas B. canescens feeds more on benthic prey. A. nigra showed a higher trophic niche breadth, because they predate more on benthic, pelagic and mesopelagic resources; whereas B. canescens feeds primarily on benthic prey. The diet of both species significantly overlapped, suggesting a high competition between them.
author	Acuña,Enzo Villarroel,Juan Carlos
author_facet	Acuña,Enzo Villarroel,Juan Carlos
author_sort	Acuña,Enzo
title	Feeding habits of two deep-sea sharks from central-northern Chile: hooktooth dogfish Aculeola nigra (Etmopteridae) and dusky catshark Bythalaelurus canescens (Scyliorhinidae)
title_short	Feeding habits of two deep-sea sharks from central-northern Chile: hooktooth dogfish Aculeola nigra (Etmopteridae) and dusky catshark Bythalaelurus canescens (Scyliorhinidae)
title_full	Feeding habits of two deep-sea sharks from central-northern Chile: hooktooth dogfish Aculeola nigra (Etmopteridae) and dusky catshark Bythalaelurus canescens (Scyliorhinidae)
title_fullStr	Feeding habits of two deep-sea sharks from central-northern Chile: hooktooth dogfish Aculeola nigra (Etmopteridae) and dusky catshark Bythalaelurus canescens (Scyliorhinidae)
title_full_unstemmed	Feeding habits of two deep-sea sharks from central-northern Chile: hooktooth dogfish Aculeola nigra (Etmopteridae) and dusky catshark Bythalaelurus canescens (Scyliorhinidae)
title_sort	feeding habits of two deep-sea sharks from central-northern chile: hooktooth dogfish aculeola nigra (etmopteridae) and dusky catshark bythalaelurus canescens (scyliorhinidae)
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000400016
work_keys_str_mv	AT acunaenzo feedinghabitsoftwodeepseasharksfromcentralnorthernchilehooktoothdogfishaculeolanigraetmopteridaeandduskycatsharkbythalaeluruscanescensscyliorhinidae AT villarroeljuancarlos feedinghabitsoftwodeepseasharksfromcentralnorthernchilehooktoothdogfishaculeolanigraetmopteridaeandduskycatsharkbythalaeluruscanescensscyliorhinidae
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Feeding habits of two deep-sea sharks from central-northern Chile: hooktooth dogfish Aculeola nigra (Etmopteridae) and dusky catshark Bythalaelurus canescens (Scyliorhinidae)

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