FN Archimer Export Format PT J TI Trends in sympatric otariid populations suggest resource limitations in the Peruvian Humboldt Current System BT AF Cárdenas-Alayza, Susana Gutiérrez, Dimitri Tremblay, Yann AS 1:1,2,4;2:2,3;3:4; FF 1:;2:;3:; C1 Centro para la Sostenibilidad Ambiental, Universidad Peruana Cayetano Heredia, Lima, 15074, Peru Laboratorio de Ciencias Del Mar, Universidad Peruana Cayetano Heredia, Lima, 15102, Peru Facultad de Ciencias y Filosofía, Programa Maestría en Ciencias Del Mar, Universidad Peruana Cayetano Heredia, Lima, 15102, Peru UMR 248 MARBEC: IRD – Univ. Montpellier – CNRS – Ifremer, Avenue Jean Monnet CS 30171, 34203, Sète Cedex, France C2 UNIV PERUANA CAYETANO HEREDIA, PERU UNIV PERUANA CAYETANO HEREDIA, PERU UNIV PERUANA CAYETANO HEREDIA, PERU IRD, FRANCE UM MARBEC IN WOS Cotutelle UMR copubli-int-hors-europe copubli-sud IF 3.737 TC 8 UR https://archimer.ifremer.fr/doc/00694/80588/83876.pdf LA English DT Article DE ;Peru;Punta San Juan;Population decline;Competition;Fur seal;Sea lion;Otaria byronia;Arctocephalus australis AB 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. PY 2021 PD JUN SO Marine Environmental Research SN 0141-1136 PU Elsevier BV VL 169 UT 000675833500004 DI 10.1016/j.marenvres.2021.105349 ID 80588 ER EF