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Structure and dynamics of the shark assemblage off recife, northeastern Brazil

2014-07Journal article Open access
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dc.contributor.authorAfonso, Andre S.
dc.contributor.authorAndrade, Humber A.
dc.contributor.authorHazin, Fábio H. V.
dc.date.accessioned2018-12-07T14:53:19Z
dc.date.available2018-12-07T14:53:19Z
dc.date.issued2014-07
dc.description.abstractUnderstanding 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.
dc.description.sponsorshipState Government of Pernambuco, Brazil; Fundacao para a Ciencia e Tecnologia, Portugal [SFRH/BD/37065/2007]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1371/journal.pone.0102369
dc.identifier.issn1932-6203
dc.identifier.urihttp://hdl.handle.net/10400.1/11453
dc.language.isoeng
dc.peerreviewedyes
dc.publisherPublic Library of Science
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectGulf-Of-Mexico
dc.subjectJuvenile sandbar sharks
dc.subjectGaleocerdo-Cuvier
dc.subjectTiger sharks
dc.subjectRelative abundance
dc.subjectCatch rates
dc.subjectRhizoprionodon-Terraenovae
dc.subjectEnvironmental Variables
dc.subjectNegaprion-Brevirostris
dc.subjectGinglymostoma Cirratum
dc.titleStructure and dynamics of the shark assemblage off recife, northeastern Brazil
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F37065%2F2007/PT
oaire.citation.issue7
oaire.citation.startPagee102369
oaire.citation.titlePLoS ONE
oaire.citation.volume9
oaire.fundingStreamSFRH
person.familyNameAfonso
person.givenNameAndré
person.identifier.ciencia-idB513-502C-1865
person.identifier.orcid0000-0001-9129-278X
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscoveryf64bd98e-b302-46df-a0af-74393d406cc4
relation.isProjectOfPublication9162cd45-5ec0-4b28-985a-08fd8ff03330
relation.isProjectOfPublication.latestForDiscovery9162cd45-5ec0-4b28-985a-08fd8ff03330

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