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Revisado por pares
Risks of dam construction for South American river dolphins: a case study of the Tapajós River
2016; Inter-Research; Volume: 31; Linguagem: Inglês
10.3354/esr00751
ISSN1863-5407
AutoresHeloíse Pavanato, Gabriel Melo‐Santos, DS Lima, Marcela Portocarrero‐Aya, Mariana Paschoalini, F Mosquera, Fernando Flores Trujillo, Ramírez Meneses, M Marmontel, Cláudio C. Maretti,
Tópico(s)Animal Vocal Communication and Behavior
ResumoESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials ESR 31:47-60 (2016) - DOI: https://doi.org/10.3354/esr00751 Risks of dam construction for South American river dolphins: a case study of the Tapajós River Heloise J. Pavanato1,*, Gabriel Melo-Santos2, Danielle S. Lima1,3, Marcela Portocarrero-Aya4, Mariana Paschoalini1,5, Federico Mosquera6, Fernando Trujillo6, Rafael Meneses1,7, Miriam Marmontel1, Cláudio Maretti8,9 1Research Group on Amazonian Aquatic Mammals, Mamirauá Institute for Sustainable Development, 2584 Estr. do Bexiga, 69553-225, Tefé, AM, Brazil 2Biology and Conservation of Amazon Aquatic Mammals, Federal University of Pará, Graduate Program of Theory and Research of Behavior, 01 Augusto Correa, 66075-110, Guamá, PA, Brazil 3Laboratory of Mastozoology, Institute of Scientific and Technological Research of the State of Amapá, Rod. Juscelino Kubitschek km. 10, 68901-025, Macapá, AP, Brazil 4Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, 15-09 Callle 28A, Bogota DC, Colombia 5Laboratory of Behavioral Ecology and Bioacoustics, Federal University of Juiz de Fora, José Lourenço Kelmer, 36036-330, Juiz de Fora, MG, Brazil 6Omacha Foundation, 23-28 Calle 86A, Bogota DC, Colombia 7Biodiversity Department, State University of Maranhão, Cidade Universitária Paulo VI, 66055-970, São Luís, Maranhão, Brazil 8WWF Living Amazon Initiative, Edificio Jade Office SGCV Lote 15, S/N, Zona Industrial Guará, 71215-650 Brazil, Brasília DC, Brazil 9Present address: Diretoria de Ações Socioambientais e Consolidação Territorial em Unidades de Conservação/Brazilian Ministry of Environment, EQSW 103/104 Bloco C, Complexo Administrativo Setor Sudoeste, 700670-350, Brasília DC, Brazil *Corresponding author: helopavanato@gmail.com ABSTRACT: River dolphins are strongly affected by the construction of hydroelectric dams. Potential isolation in subpopulations above and below such dams and the resulting low genetic variability of these subpopulations can cause extinction at a local level. Here we aimed to estimate density and population size of South American river dolphins (boto Inia geoffrensis and tucuxi Sotalia fluviatilis), map their distribution, and estimate potential biological removal (PBR) limits in order to evaluate the effects of population fragmentation between planned dams in the Tapajós River, Amazonian basin, Brazil. Boat-based surveys were conducted following a line transect sampling protocol covering different dolphin habitats in 2 stretches of the river divided by rapids. The mark-recapture distance sampling method was applied to account for animals missed on the trackline. After the estimation of population sizes by habitat, PBR was calculated. The farthest upriver sighting of tucuxis was close to the São Luiz do Tapajós rapids, whereas the farthest upriver sighting of botos was upstream of the rapids, suggesting that botos move upstream through the rapids. Estimated abundance of tucuxis (3372 ind., CV = 0.38) was twice as high as that estimated for botos (1815 ind., CV = 0.4). The PBR ranged from 11 to 18 ind. for boto and 21 to 34 for tucuxi. Throughout this study, we identified low abundances of river dolphins compared to other Amazon rivers. Boto may not be sustainable at a population level, due primarily to population fragmentation which would result from the construction of the proposed dams. Precautionary measures are urgently needed before construction of dams begins in the Tapajós River. KEY WORDS: Cetacean abundance · Distance sampling · Inia geoffrensis · Sotalia fluviatilis · Extinction · IUCN Red List Category · Marine mammal · Population modeling Full text in pdf format Corrigendum PreviousNextCite this article as: Pavanato HJ, Melo-Santos G, Lima DS, Portocarrero-Aya M and others (2016) Risks of dam construction for South American river dolphins: a case study of the Tapajós River. Endang Species Res 31:47-60. https://doi.org/10.3354/esr00751 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in ESR Vol. 31. Online publication date: September 21, 2016 Print ISSN: 1863-5407; Online ISSN: 1613-4796 Copyright © 2016 Inter-Research.
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