Sotalia fluviatilis

Silva, Vera Maria Ferreira da; Best, Robin C.

doi:10.2307/3504117

Cited by 95 publications

(94 citation statements)

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“…In Peru the distribution includes the following rivers: Amazonas, Marañon, Yanayaquillo, Atun Caño, Yanayacu, Pucate, Pacaya, Samiria, Tanshiyaco, Tahuayo, Huaysi, Yapara, Nauta Caño, Tapiche and Ucayali; and for the lakes San Pablo de Tipishca, Atun Cocha and Tipishca del Samiria, as well as Napo, Tigre, Mazon, Nanay, and Momon rivers, among others (da Silva and Best, 1996;Leatherwood et al, 2000;McGuire, 2006 14 ).…”

Section: Distributionmentioning

confidence: 99%

“…In Colombia, records of S. fluviatilis exist for the following rivers: main course of the Amazon-Marañón, as well as the Putumayo, Caquetá, Tigre, Loreto Yacu, Atacuarí, and Amacayacu Rivers, including the lakes Tarapoto, El Correo, and Caballo Cocha situated at the border of Peru with Colombia (da Silva and Best, 1996; Trujillo, 1992;Trujillo, 1994;Trujillo and Beltrán, 1995;Vidal et al, 1997;Dussán-Duque et al, 2006 12 ), as well as the Napo, Mazon, Nanay, Momon, Tamshiyacu and Tahuayo (Kasuya and Kajihara, 1974).…”

Section: Distributionmentioning

confidence: 99%

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Report of the Working Group on Distribution, Habitat Characteristics and Preferences, and Group Size

Silva¹,

Fettuccia²,

Rodrigues³

et al. 2010

Lat. Am. J. Aquat. Mamm.

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Section: Distributionmentioning

confidence: 99%

Section: Distributionmentioning

confidence: 99%

Report of the Working Group on Distribution, Habitat Characteristics and Preferences, and Group Size

Silva¹,

Fettuccia²,

Rodrigues³

et al. 2010

Lat. Am. J. Aquat. Mamm.

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“…Ecological and biogeographic approaches also corroborate such taxonomic status, as the marine Sotalia occurs in almost all South and Central America coastal areas (SILVA & BEST 1994, 1996, MONTEIRO-FILHO et al 2002, and the freshwater species is probably restricted to the Amazon basin. Further investigations concerning the entrance of marine specimens in the riverine area of the Amazon river, and its extent, and the usage of coastal area by freshwater specimens may provide more detailed information about simpatry or even inbreeding and genetic flow.…”

mentioning

confidence: 72%

The correct use of the vernacular names for South American dolphins genus Sotalia Gray (Mammalia, Cetacea, Delphinidae)

Geise

2006

Rev. Bras. Zool.

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“…Population estimates of tucuxi are scarce, in part because of the vast range of the species (the Amazon Basin and the lower Orinoco River Basin), and in part because of challenging logistics and survey methods. Most studies have reported results in terms of relative dolphin densities or encounter rates (Layne, 1958;Magnusson et al, 1980;Best and da Silva, 1989;Borobia et al, 1991;da Silva, 1994;da Silva and Best, 1996;Herman et al,1996;Leatherwood, 1996;Trujillo, 1992;Vidal et al, 1997;Galindo, 1998;Henningsen, 1998;Reeves et al,1999;McGuire, 2002;Martin et al, 2004), as true densities are often difficult to obtain due to the complex LAJAM 8(1-2): 103-110, December 2010 habitat, elusive behavior, and patchy distribution of tucuxi. Several related studies of river dolphin (Sotalia and Inia) ecology and conservation have been conducted in Peru's Pacaya-Samiria Reserve as part of a long-term project initiated in 1991 (Leatherwood, 1996;Leatherwood et al, 2000), and continued by Henningsen (1998), Zúñiga (1999), andMcGuire (2002).…”

Section: Introductionmentioning

confidence: 99%

Ecology and conservation status of tucuxi (Sotalia fluviatilis) in the Pacaya-Samiria Reserve, Peru

McGuire¹

2010

Lat. Am. J. Aquat. Mamm.

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The distribution, relative abundance, group size, reproductive seasonality, and conservation status of tucuxi (Sotalia fluviatilis) were investigated in Peru's Pacaya-Samiria National Reserve from 1996 to 2000. Data collection consisted of boat-based surveys of dolphins and habitat, necropsies, photo-identification of individual dolphins, and interviews with local people. Mean encounter rates were between 0.01-0.80 tucuxi/km in rivers, and 0.05-2.17 tucuxi/km 2 in lakes, and were within the ranges reported for riverine tucuxi throughout their distribution. Encounter rates were highest in confluences, intermediate in lakes, and lowest in rivers. Encounter rates increased with river width. Most tucuxis were seen within 100m from shore in large rivers, and large groups were associated with confluence areas and mid-channel islands. Within lakes, tucuxis were associated with areas of deeper water. Tucuxis were not found in waters < 3m depth in rivers, or <1.8m depth in lakes. Seasonal differences in encounter rates did not exist in lakes and rivers. In confluences tucuxis occurred in highest densities during low water, and lowest densities during high water. Diurnal patterns of occurrence were not observed. Tucuxis were seen most often as singles or pairs, although groups as large as 13 were observed. Significant seasonal differences in group size were not detected. Neonate tucuxi were observed in all seasons, with a slight peak in encounter rates during high water. Abundance estimates were affected by survey methods, and strengths and weaknesses of various methods are discussed. Photo-identification rates were low, and this method did not yield information about tucuxi site fidelity, movement patterns, social structure, or population size. Local people in the Reserve did not seem to have the same myths and general apprehension about tucuxis as for the other sympatric dolphin, Inia. There was no evidence that tucuxi were poisoned by fishermen, unlike Inia. Potential threats to tucuxi in this region were entanglement in fishing gear, mercury in migratory fish from gold mining elsewhere, oil spills, ship strikes, and disturbance from boats. Only one dead tucuxi was encountered, and had been entangled in a turtle net. Tucuxi teeth were found for sale in local markets. RESUMEN:Desde 1996 al año 2000 se estudió la distribución, abundancia relativa, tamaño de grupo, estacionalidad reproductiva y el estatus del delfín de rió tucuxi (Sotalia fluviatilis) en la Reserva Nacional Pacaya-Samiria del Perú. La toma de datos consistió en evaluaciones de delfines y hábitat desde botes, necropsias, foto-identificación de individuos, y entrevistas con gente local. Las tasas medias de encuentro se encuentran entre 0.01-0.80 tucuxi/km en ríos, y de 0.05-2.17 tucuxi/km 2 en lagos, y estuvieron dentro de los rangos reportados para tucuxi a lo largo de su distribución. Las tasas de encuentro fueron más altas en confluencias, intermedias en lagos y las más bajas en ríos. Las tasas de encuentro incrementaron con el ancho del rió. L...

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Sotalia fluviatilis

Cited by 95 publications

References 0 publications

Report of the Working Group on Distribution, Habitat Characteristics and Preferences, and Group Size

Report of the Working Group on Distribution, Habitat Characteristics and Preferences, and Group Size

The correct use of the vernacular names for South American dolphins genus Sotalia Gray (Mammalia, Cetacea, Delphinidae)

Ecology and conservation status of tucuxi (Sotalia fluviatilis) in the Pacaya-Samiria Reserve, Peru

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