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Franciscana dolphins, Pontoporia blainvillei, of the Río Negro Estuary, Patagonia, Argentina

Published online by Cambridge University Press:  12 October 2012

Mauricio Failla ,
Verónica A. Seijas ,
Roberto Espósito  and
Miguel A. Iñíguez
Mauricio Failla*
Affiliation:
Fundación Cethus, Potosí 2087, (B1636BUA), Olivos, Buenos Aires Province, Argentina
Verónica A. Seijas
Affiliation:
Proyecto Patagonia Noreste, Gianni 367, CP (8501), Balneario El Cóndor, Río Negro, Argentina
Roberto Espósito
Affiliation:
Proyecto Patagonia Noreste, Gianni 367, CP (8501), Balneario El Cóndor, Río Negro, Argentina
Miguel A. Iñíguez
Affiliation:
Fundación Cethus, Potosí 2087, (B1636BUA), Olivos, Buenos Aires Province, Argentina Whale and Dolphin Conservation Society, Brookfield House, 38 St Paul Street, Chippenham, UK
*
Correspondence should be addressed to: M. Failla, Fundación Cethus, Potosí 2087, (B1636BUA) Olivos, Buenos Aires Province, Argentina email: mauricio.failla@cethus.org
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Abstract

Studies on the biology of the franciscana dolphin (Pontoporia blainvillei) in the Río Negro Estuary (RNE), Patagonia, Argentina, were carried out from 2002 to 2011. Information about group size, group dispersion and behaviour was collected from the coast and by boat, using scanning and focal animal/group sampling methodology. Group size varied from 1 to 5 dolphins (X = 1.69; standard deviation (SD) = 0.74; N = 121), 2 being the most frequent value (46.28%; N = 56). Group dispersion varied from 0 to 10 dolphin length (DL) (X = 1.4; SD = 0.75; N = 51), 0 DL (54.9%; N = 28) being the most frequent value. Behaviour of travelling, feeding, milling and resting were recorded, with a higher frequency of animals travelling (36.58%; N = 45). Calves were observed in spring and summer (N = 10). 13 stranded individuals were reported and 3 of them were collected from gillnets. Data presented herein indicate year-round presence of franciscana as well as the RNE being the southernmost breeding and feeding site reported to date. The establishment of the proposed natural reserve by the Governments of Río Negro and Buenos Aires provinces and continued long-term studies are urgently recommended.

Keywords

franciscana dolphinsPontoporia blainvilleihabitat usebehaviourPatagoniaArgentina
Type
Research Article
Information
Marine Biodiversity Records , Volume 5 , August 2012 , e102
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012

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