Universidad Peruana Cayetano Heredia

Effective population size for South American sea lions along the Peruvian coast: The survivors of the strongest El Niño event in history

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dc.contributor.author De Oliveira, L.R.
dc.contributor.author Fraga, L.D.
dc.contributor.author Majluf, P.
dc.date.accessioned 2022-01-18T19:26:49Z
dc.date.available 2022-01-18T19:26:49Z
dc.date.issued 2012
dc.identifier.uri https://hdl.handle.net/20.500.12866/10905
dc.description.abstract The South American sea lion, Otaria flavescens, has been considered vulnerable and under the threat of extinction in Peru due to the drastic demographic changes as a result of the impact of low food availability and the unusual timing of the severe El Niño event of 1997-1998. We present the first estimate of effective population size (Ne ) for the species that takes into account the effects of mating system and variation in population size in different generations caused by the severe El Niño event of 1997-1998. The resulting Ne was 7715 specimens. We believe that the estimated Ne for the Peruvian population is not a critical value, because it is higher than the mean minimum viable population generally accepted for vertebrates (ca. 5000 breeding adults). However, the viability of O. flavescens on the Peruvian coast may depend primarily on local availability of food resources. Climatic change models predict stronger and more frequent El Niño events. In this sense, the Ne of 7715 should be considered as a value to be maintained in order to keep the population large enough to avoid inbreeding or to retain adaptive genetic variation to survive to future El Niño events. Moreover, this Ne estimate is important data in discussions about resuming culling activities, based on the statement of an increasing competition between fishery activity and sea lions during El Niño events. Thus, this Ne should be taken into account in future management plans to ensure the conservation of the species on the Peruvian coast. en_US
dc.language.iso eng
dc.publisher Crambridge University Press
dc.relation.ispartofseries Journal of the Marine Biological Association of the United Kingdom
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Peru en_US
dc.subject El Nino-Southern Oscillation en_US
dc.subject survival en_US
dc.subject abandoned mine en_US
dc.subject genetic variation en_US
dc.subject population size en_US
dc.subject vulnerability en_US
dc.subject coastal zone en_US
dc.subject effective population size en_US
dc.subject El Niño Southern Oscillation en_US
dc.subject extinction risk en_US
dc.subject food availability en_US
dc.subject inbreeding en_US
dc.subject inbreeding avoidance en_US
dc.subject Otaria byronia en_US
dc.subject Otaria flavescens en_US
dc.subject Otariidae en_US
dc.subject Peruvian population en_US
dc.subject pinniped en_US
dc.subject reproductive strategy en_US
dc.subject Vertebrata en_US
dc.title Effective population size for South American sea lions along the Peruvian coast: The survivors of the strongest El Niño event in history en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1017/S0025315411001871
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.06.12
dc.relation.issn 1469-7769


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