DSpace Repository

Strategies for segregation during foraging in sympatric otariids of the Peruvian upwelling Humboldt Current System

Show simple item record

dc.contributor.author Cárdenas-Alayza, Susana
dc.contributor.author Adkesson, M.J.
dc.contributor.author Gutierrez Aguilar, Dimitri Alexey
dc.contributor.author Demarcq, H.
dc.contributor.author Tremblay, Y.
dc.date.accessioned 2023-01-06T13:40:12Z
dc.date.available 2023-01-06T13:40:12Z
dc.date.issued 2022
dc.identifier.uri https://hdl.handle.net/20.500.12866/13005
dc.description.abstract The competitive exclusion principle predicts that species exhibit segregation mechanisms to coexist. In the Humboldt Current System, South American sea lions Otaria byronia (SASL) coexist with South American fur seals Arctocephalus australis (SAFS); however, the existence of temporal and spatial partitioning in foraging strategies remains unknown. To compare foraging strategies, we analyzed locations of 35 adults (18 SASL, 17 SAFS; 4 and 8 females, 14 and 9 males, respectively) equipped with satellite tags in Punta San Juan, Peru (2013−2017). We evaluated (1) distance and duration of foraging trips, (2) utilization distributions (UDs), (3) foraging by hour and (4) association of foraging with environmental variables. Regular interval tracks (every 30 min) were modeled, and residence time was estimated to determine foraging events. Proportion overlap and analysis of similarity compared groups in core areas (50% UD) and home ranges (95% UD). Generalized additive mixed models were built to determine if hour of day and environmental conditions had an effect on foraging. Multiple mechanisms for foraging segregation that explain coexistence were found. Duration and distance between species−sex groups were significantly different, except for trip duration between SASL sexes. SAFS traveled longer distances and duration than SASL, and males traveled longer distances and duration than conspecific females. Female UDs overlapped, while male UDs did not. Core areas between sexes overlapped in SAFS and SASL, but home ranges were significantly different. Hour of day had a significant effect on foraging events in SAFS females and SASL males. Environmental conditions during foraging by SASL and SAFS females reflected coastal and offshore habitats, respectively. However, interspecific segregation was not evident between males. en_US
dc.language.iso eng
dc.publisher Inter-Research
dc.relation.ispartofseries Marine Ecology Progress Series
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Interspecific segregation en_US
dc.subject Pinnipeds en_US
dc.subject Coexistence en_US
dc.subject Arctocephalus australis en_US
dc.subject Otaria byronia en_US
dc.title Strategies for segregation during foraging in sympatric otariids of the Peruvian upwelling Humboldt Current System en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.3354/meps14203
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#4.01.08
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.11
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.06.13
dc.relation.issn 1616-1599


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

info:eu-repo/semantics/restrictedAccess Except where otherwise noted, this item's license is described as info:eu-repo/semantics/restrictedAccess

Search DSpace


Browse

My Account

Statistics