Abundance estimate of the Amazon River dolphin (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) in southern Ucayali, Peru

ABSTRACT We 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 observatio...

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Autores principales:	Campbell,Elizabeth, Alfaro-Shigueto,Joanna, Godley,Brendan J., Mangel,Jeffrey C.
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2017
Materias:	Inia geoffrensis Sotalia fluviatilis boto tucuxi population abundance seasonality echolocation loggers C-POD
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000500957
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spelling	oai:scielo:S0718-560X20170005009572017-12-07Abundance estimate of the Amazon River dolphin (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) in southern Ucayali, PeruCampbell,ElizabethAlfaro-Shigueto,JoannaGodley,Brendan J.Mangel,Jeffrey C. Inia geoffrensis Sotalia fluviatilis boto tucuxi population abundance seasonality echolocation loggers C-POD ABSTRACT We 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−2 and an overall abundance of 34 individuals (95% CI: 28 to 40). Average density for Inia was 0.2 ± 1.2 ind km−2 with 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.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.45 n.5 20172017-11-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000500957en10.3856/vol45-issue5-fulltext-11
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Inia geoffrensis Sotalia fluviatilis boto tucuxi population abundance seasonality echolocation loggers C-POD
spellingShingle	Inia geoffrensis Sotalia fluviatilis boto tucuxi population abundance seasonality echolocation loggers C-POD Campbell,Elizabeth Alfaro-Shigueto,Joanna Godley,Brendan J. Mangel,Jeffrey C. Abundance estimate of the Amazon River dolphin (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) in southern Ucayali, Peru
description	ABSTRACT We 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−2 and an overall abundance of 34 individuals (95% CI: 28 to 40). Average density for Inia was 0.2 ± 1.2 ind km−2 with 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.
author	Campbell,Elizabeth Alfaro-Shigueto,Joanna Godley,Brendan J. Mangel,Jeffrey C.
author_facet	Campbell,Elizabeth Alfaro-Shigueto,Joanna Godley,Brendan J. Mangel,Jeffrey C.
author_sort	Campbell,Elizabeth
title	Abundance estimate of the Amazon River dolphin (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) in southern Ucayali, Peru
title_short	Abundance estimate of the Amazon River dolphin (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) in southern Ucayali, Peru
title_full	Abundance estimate of the Amazon River dolphin (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) in southern Ucayali, Peru
title_fullStr	Abundance estimate of the Amazon River dolphin (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) in southern Ucayali, Peru
title_full_unstemmed	Abundance estimate of the Amazon River dolphin (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) in southern Ucayali, Peru
title_sort	abundance estimate of the amazon river dolphin (inia geoffrensis) and the tucuxi (sotalia fluviatilis) in southern ucayali, peru
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2017
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000500957
work_keys_str_mv	AT campbellelizabeth abundanceestimateoftheamazonriverdolphininiageoffrensisandthetucuxisotaliafluviatilisinsouthernucayaliperu AT alfaroshiguetojoanna abundanceestimateoftheamazonriverdolphininiageoffrensisandthetucuxisotaliafluviatilisinsouthernucayaliperu AT godleybrendanj abundanceestimateoftheamazonriverdolphininiageoffrensisandthetucuxisotaliafluviatilisinsouthernucayaliperu AT mangeljeffreyc abundanceestimateoftheamazonriverdolphininiageoffrensisandthetucuxisotaliafluviatilisinsouthernucayaliperu
_version_	1714205190732644352

Abundance estimate of the Amazon River dolphin (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) in southern Ucayali, Peru

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