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    Cremer, Marta J. Holz, Annelise C. Sartori, Camila M. Schulze, Beatriz Paitach, Renan L. and Simões-Lopes, Paulo C. 2018. Advances in Marine Vertebrate Research in Latin America. Vol. 22, Issue. , p. 477.
    Panebianco, María V. Del Castillo, Daniela L. Denuncio, Pablo E. Negri, María F. Bastida, Ricardo Failla, Mauricio Vitullo, Alfredo D. and Cappozzo, Humberto L. 2016. Reproductive biology of female franciscana dolphins (Pontoporia blainvillei) from Argentina. Journal of the Marine Biological Association of the United Kingdom, Vol. 96, Issue. 04, p. 831.
    Gariboldi, María Constanza Túnez, Juan Ignacio Dejean, Cristina Beatriz Failla, Mauricio Vitullo, Alfredo Daniel Negri, María Fernanda Cappozzo, Humberto Luis and Kolokotronis, Sergios-Orestis 2015. Population Genetics of Franciscana Dolphins (Pontoporia blainvillei): Introducing a New Population from the Southern Edge of Their Distribution. PLOS ONE, Vol. 10, Issue. 7, p. e0132854.
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Franciscana dolphins, Pontoporia blainvillei, of the Río Negro Estuary, Patagonia, Argentina

  • Mauricio Failla (a1), Verónica A. Seijas (a2), Roberto Espósito (a2) and Miguel A. Iñíguez (a1) (a3)
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.

Copyright
COPYRIGHT: © Marine Biological Association of the United Kingdom 2012
Corresponding author
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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