[MARMAM] New publication of franciscana dolphins from Patagonia Argentina

Mauricio Failla mauricio.failla at cethus.org
Mon Dec 10 13:23:37 PST 2012

Dear Colleagues,
We are pleased to inform about the new publication on the biology of franciscana dolphins (Pontoporia blainvillei) in Patagonia Argentina:


Failla M, Seijas VA, Esposito R y Iñiguez MI. 2012. Franciscana Dolphins, Pontoporia blainvillei, of the Río Negro Estuary, Patagonia, Argentina. Marine Biodiversity Records, 5, e102 doi:10.1017/S1755267212000875



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 dolphins; Pontoporia blainvillei ; habitat use; behaviour; Patagonia; Argentina.


The full publication can be downloaded from:

Greetings to all,


Fundación Cethus - 20 years





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