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Trends in sympatric otariid populations suggest resource limitations in the Peruvian Humboldt Current System

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dc.contributor.author Cardenas Alayza, Susana
dc.contributor.author Gutierrez Aguilar, Dimitri Alexey
dc.contributor.author Tremblay, Yann
dc.date.accessioned 2021-06-08T15:46:15Z
dc.date.available 2021-06-08T15:46:15Z
dc.date.issued 2021
dc.identifier.uri https://hdl.handle.net/20.500.12866/9516
dc.description.abstract Sympatric species evolve mechanisms to avoid competition and coexist. In the Humboldt Current System (HCS), populations of South American sea lions (SASL, Otaria byronia) and South American fur seals (SAFS, Arctocephalus australis) fluctuate mostly due to ENSO events and prey availability. We evaluate population trajectories of Peruvian sympatric otariids and discuss mechanisms for competition and/or resource limitation. For this purpose, we analyzed population trajectories of SASL and SAFS in a sympatric breeding site in Punta San Juan, Peru between 2001 and 2019. Wavelet analysis was used to extract trends and derivatives to estimate rates and turning points. Age-class proportions and biomass times series were constructed from weekly counts and evaluated. Both populations show a growth phase and subsequent decline. SAFS started to decline ~2.25 years before and at a rate 1.5 times faster than SASL. Decrease in juvenile age-class suggests that resource limitation is the main contributing factor for current population decline. en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartofseries Marine Environmental Research
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 Arctocephalus australis en_US
dc.subject Competition en_US
dc.subject Fur seal en_US
dc.subject Otaria byronia en_US
dc.subject Population decline en_US
dc.subject Punta San Juan en_US
dc.subject Sea lion en_US
dc.title Trends in sympatric otariid populations suggest resource limitations in the Peruvian Humboldt Current System en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.marenvres.2021.105349
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.08
dc.relation.issn 1879-0291


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