Structure and dynamics of the shark assemblage off Recife, Northeastern Brazil.

Understanding the ecological factors that regulate elasmobranch abundance in nearshore waters is essential to effectively manage coastal ecosystems and promote conservation. However, little is known about elasmobranch populations in the western South Atlantic Ocean. An 8-year, standardized longline...

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Autores principales:	André S Afonso, Humber A Andrade, Fábio H V Hazin
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9f76629c674e4440830d9837c8414cc5
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spelling	oai:doaj.org-article:9f76629c674e4440830d9837c8414cc52021-11-25T06:08:58ZStructure and dynamics of the shark assemblage off Recife, Northeastern Brazil.1932-620310.1371/journal.pone.0102369https://doaj.org/article/9f76629c674e4440830d9837c8414cc52014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25010514/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Understanding the ecological factors that regulate elasmobranch abundance in nearshore waters is essential to effectively manage coastal ecosystems and promote conservation. However, little is known about elasmobranch populations in the western South Atlantic Ocean. An 8-year, standardized longline and drumline survey conducted in nearshore waters off Recife, northeastern Brazil, allowed us to describe the shark assemblage and to monitor abundance dynamics using zero-inflated generalized additive models. This region is mostly used by several carcharhinids and one ginglymostomid, but sphyrnids are also present. Blacknose sharks, Carcharhinus acronotus, were mostly mature individuals and declined in abundance throughout the survey, contrasting with nurse sharks, Ginglymostoma cirratum, which proliferated possibly due to this species being prohibited from all harvest since 2004 in this region. Tiger sharks, Galeocerdo cuvier, were mostly juveniles smaller than 200 cm and seem to use nearshore waters off Recife between January and September. No long-term trend in tiger shark abundance was discernible. Spatial distribution was similar in true coastal species (i.e. blacknose and nurse sharks) whereas tiger sharks were most abundant at the middle continental shelf. The sea surface temperature, tidal amplitude, wind direction, water turbidity, and pluviosity were all selected to predict shark abundance off Recife. Interspecific variability in abundance dynamics across spatiotemporal and environmental gradients suggest that the ecological processes regulating shark abundance are generally independent between species, which could add complexity to multi-species fisheries management frameworks. Yet, further research is warranted to ascertain trends at population levels in the South Atlantic Ocean.André S AfonsoHumber A AndradeFábio H V HazinPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 7, p e102369 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q André S Afonso Humber A Andrade Fábio H V Hazin Structure and dynamics of the shark assemblage off Recife, Northeastern Brazil.
description	Understanding the ecological factors that regulate elasmobranch abundance in nearshore waters is essential to effectively manage coastal ecosystems and promote conservation. However, little is known about elasmobranch populations in the western South Atlantic Ocean. An 8-year, standardized longline and drumline survey conducted in nearshore waters off Recife, northeastern Brazil, allowed us to describe the shark assemblage and to monitor abundance dynamics using zero-inflated generalized additive models. This region is mostly used by several carcharhinids and one ginglymostomid, but sphyrnids are also present. Blacknose sharks, Carcharhinus acronotus, were mostly mature individuals and declined in abundance throughout the survey, contrasting with nurse sharks, Ginglymostoma cirratum, which proliferated possibly due to this species being prohibited from all harvest since 2004 in this region. Tiger sharks, Galeocerdo cuvier, were mostly juveniles smaller than 200 cm and seem to use nearshore waters off Recife between January and September. No long-term trend in tiger shark abundance was discernible. Spatial distribution was similar in true coastal species (i.e. blacknose and nurse sharks) whereas tiger sharks were most abundant at the middle continental shelf. The sea surface temperature, tidal amplitude, wind direction, water turbidity, and pluviosity were all selected to predict shark abundance off Recife. Interspecific variability in abundance dynamics across spatiotemporal and environmental gradients suggest that the ecological processes regulating shark abundance are generally independent between species, which could add complexity to multi-species fisheries management frameworks. Yet, further research is warranted to ascertain trends at population levels in the South Atlantic Ocean.
format	article
author	André S Afonso Humber A Andrade Fábio H V Hazin
author_facet	André S Afonso Humber A Andrade Fábio H V Hazin
author_sort	André S Afonso
title	Structure and dynamics of the shark assemblage off Recife, Northeastern Brazil.
title_short	Structure and dynamics of the shark assemblage off Recife, Northeastern Brazil.
title_full	Structure and dynamics of the shark assemblage off Recife, Northeastern Brazil.
title_fullStr	Structure and dynamics of the shark assemblage off Recife, Northeastern Brazil.
title_full_unstemmed	Structure and dynamics of the shark assemblage off Recife, Northeastern Brazil.
title_sort	structure and dynamics of the shark assemblage off recife, northeastern brazil.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/9f76629c674e4440830d9837c8414cc5
work_keys_str_mv	AT andresafonso structureanddynamicsofthesharkassemblageoffrecifenortheasternbrazil AT humberaandrade structureanddynamicsofthesharkassemblageoffrecifenortheasternbrazil AT fabiohvhazin structureanddynamicsofthesharkassemblageoffrecifenortheasternbrazil
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Structure and dynamics of the shark assemblage off Recife, Northeastern Brazil.

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