Extinction of a shark population in the Archipelago of Saint Paul's Rocks (equatorial Atlantic) inferred from the historical record

dc.creatorLuiz, OJ
dc.creatorEdwards, AJ
dc.date2011
dc.dateDEC
dc.date2014-07-30T17:34:11Z
dc.date2015-11-26T16:45:39Z
dc.date2014-07-30T17:34:11Z
dc.date2015-11-26T16:45:39Z
dc.date.accessioned2018-03-28T23:31:17Z
dc.date.available2018-03-28T23:31:17Z
dc.identifierBiological Conservation. Elsevier Sci Ltd, v. 144, n. 12, n. 2873, n. 2881, 2011.
dc.identifier0006-3207
dc.identifierWOS:000298521500017
dc.identifier10.1016/j.biocon.2011.08.004
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/66551
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/66551
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1274283
dc.descriptionDetecting and determining the validity of local extinctions is an important conservation measure in order to uncover management failures. There are quantitative and qualitative methods that estimate extinction probability based on past sighting records. However, because current baselines about species' abundances and distributions in the sea were mostly established after humans had started affecting marine populations, researchers must often rely on historical data to elucidate past environmental conditions. We review early historical records from the Archipelago of Saint Paul's Rocks, together with data from recent expeditions, with the aim of testing the hypothesis that reef sharks (Carcharhinus spp.) have become extinct there. Our analyses are based on non-parametric probabilistic tests for extinction and on a qualitative framework to examine and judge as objectively as possible the likelihood of local extinction. Until the mid-20th century, visitors to St. Paul's Rocks invariably commented on the remarkable number of sharks around the Archipelago. These observations contrast with those of expeditions carried out during the last decade, which report no carcharhinid reef sharks while scuba diving in the archipelago, despite many more hours of underwater fieldwork than previous expeditions. All quantitative and qualitative methods conclude that the reef shark Carcharhinus galapagensis is locally extinct at St. Paul's Rocks after a sharp decrease in abundance that took place following the commencement of fishing. However, the persistence of occasional individuals of the once locally common Carcharhinus falciformis in the vicinity of the Archipelago, as a result of constant immigration of this oceanic species from outside the area, suggest that the population might recover if the present fishing pressure was removed. (C) 2011 Elsevier Ltd. All rights reserved.
dc.description144
dc.description12
dc.description2873
dc.description2881
dc.languageen
dc.publisherElsevier Sci Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationBiological Conservation
dc.relationBiol. Conserv.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectShifting baselines
dc.subjectLocal extinction
dc.subjectOceanic island
dc.subjectCarcharhinus galapagensis
dc.subjectCarcharhinus falciformis
dc.subjectFishing impact
dc.subjectProbabilistic tests
dc.subjectGulf-of-california
dc.subjectNorthern Line Islands
dc.subjectCoral-reefs
dc.subjectBase-lines
dc.subjectCarcharhinus Galapagensis
dc.subjectFish Communities
dc.subjectSighting Records
dc.subjectPredatory Sharks
dc.subjectPelagic Sharks
dc.subjectMarine
dc.titleExtinction of a shark population in the Archipelago of Saint Paul's Rocks (equatorial Atlantic) inferred from the historical record
dc.typeArtículos de revistas


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