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dc.contributor.authorCampbell, E.
dc.contributor.authorShigueto, J.A.
dc.contributor.authorGodley, B.J.
dc.contributor.authorMangel, J.C.
dc.date.accessioned2025-10-31T18:36:24Z
dc.date.available2025-10-31T18:36:24Z
dc.date.issued2017
dc.identifier.urihttps://hdl.handle.net/20.500.12805/5406
dc.description.abstractWe present results of the first simultaneous visual and acoustic surveys for Amazon River dolphins (Inia geoffrensis) and tucuxi (Sotalia fluviatilis), undertaken in Yarinacocha Lagoon, Ucayali, Peru (length = 20 km, area = 12 km2). A total of 324 Sotalia observations and 44 Inia observations were recorded in boat-based transects. Based upon total survey effort, we estimated Sotalia had a mean density ± SE of 1.98 ± 4.6 ind km-2and an overall abundance of 34 individuals (95% CI: 28 to 40). Average density for Inia was 0.2 ± 1.2 ind km-2with overall abundance estimated at 3 individuals (95% CI: 0 to 8). Visual surveys observed more Sotalia individuals during earlier hours of the day and during the dry season. Preliminary acoustic surveys undertaken with C-POD passive acoustic monitoring devices indicated a diel pattern in detections of cetacean vocalization with more diurnal activity and with detections ceasing from midnight until 10:00 AM. This work highlights the possibility of monitoring both river dolphin species through visual and acoustic surveys to generate baseline information on abundance trends and distribution patterns in the Ucayali region, an area with high levels of human disturbance.en_US
dc.description.sponsorshipThis work was supported by the Rufford Small Grants Foundation, Conservation Leadership Programme, World Wildlife Fund, ProDelphinus and University of Exeter. Many thanks to Nick Tregenza, Robert Palacios, Andrea Pasara, Luis Miguel Barron and all researchers that participated in the collection of data used in this study. We would like to thank the communities of Pucallpa, and Yarinacocha lagoon for their generous hospitality to the researchers that were involved in the study. We are also very appreciative of the three reviewers of this manuscript; we thank them for their detailed comments and suggestions.
dc.formatapplication/pdf
dc.language.isoeng
dc.publisherEscuela de Ciencias del Mar
dc.relation.ispartofurn:issn:0718-560X
dc.rightshttps://purl.org/coar/access_right/c_abf2
dc.rights.urihttps://creativecommons.org/licenses/by-nc-sa/4.0/
dc.subjectAcoustic Monitoring of Marine Mammal Populationsen_US
dc.subjectConservation and Ecology of Amazon River Dolphinsen_US
dc.titleAbundance estimate of the Amazon River Dolphin (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) in southern Ucayali, Peruen_US
dc.typehttps://purl.org/coar/resource_type/c_2df8fbb1
dc.identifier.doihttps://doi.org/10.3856/vol45-issue5-fulltext-11
dc.subject.ocdehttps://purl.org/pe-repo/ocde/ford#1.06.12
dc.type.otherResearch article
dc.identifier.journalLatin American Journal of Aquatic Research
dc.type.versionhttps://purl.org/coar/version/c_970fb48d4fbd8a85


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