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Age and growth of Franciscana dolphins from northern Argentina

  • Pablo Denuncio (a1) (a2), María Fernanda Negri (a2) (a3), Ricardo Bastida (a1) (a2) and Diego Rodríguez (a1) (a2)


Knowledge of growth patterns of an animal species is fundamental to understand their life history. This information is also used to help define population boundaries of threatened cetaceans, such as the Franciscana dolphin, Pontoporia blainvillei. A total of 108 Franciscana dolphins incidentally captured in artisanal fishing nets in estuarine and marine coastal waters of the northern part of the Franciscana Management Area IV (North FMA IV), Argentina, were studied. The objective of the present paper was to study age and growth parameters of Franciscanas from North FMA IV and to compare these parameters between estuarine and marine potential populations within this area. We used von Bertalanffy and Gompertz growth curves to model growth trajectories. The estimated asymptotic lengths demonstrated that Franciscana dolphins from this area were smaller (females: 136.3 cm and males, 122.1 cm) than southern FMA IV values previously published. They also showed the reverse sexual size dimorphism that is known across their range. However, the estimated asymptotic length was not statistically different between the estuarine and marine females within the study area. In spite of this, the fact that the northern forms of the FMA IV were smaller than the southern specimens supports the hypothesis of more than one population of the species within this management area. The North FMA IV has the highest reported mortality levels of Franciscana dolphins within the FMA IV; these results are relevant to the knowledge base of Franciscana dolphins in the region.


Corresponding author

Correspondence should be addressed to: P. Denuncio, Departamento de Ciencias Marinas, Facultad de Ciencias Exactas y Naturales, Instituto de Investigaciones Marinas y Costeras (IIMyC), Universidad Nacional de Mar del Plata, Funes 3350, Mar del Plata B7602AYL, Argentina email:


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Barbato, B.H.A., Secchi, E.R., Di Beneditto, A.P.M., Ramos, A.P.M., Bertozzi, C., Marigo, J., Bordino, P. and Kinas, P. (2012) Geographical variation in Franciscana (Pontoporia blainvillei) external morphology. Journal of the Marine Biological Association of the United Kingdom 92, 16451656.
Barreto, A.S. and Rosas, F.C.W. (2006) Comparative growth analysis of two populations of Pontoporia blainvillei on the Brazilian coast. Marine Mammal Science 22, 644653.
Bastida, R., Rodríguez, D., Secchi, E. and da Silva, V. (2007) Mamíferos Acuáticos de Sudamérica y Antártida. Buenos Aires: Vázquez Mazzini Editores.
Bordino, P. and Albareda, D. (2004) Incidental mortality of Franciscana dolphin Pontoporia blainvillei in coastal gillnet fisheries in northern Buenos Aires. Argentina. Paper SC/56/SM11 presented at the International Whaling Commission Meeting, Sorrento, Italy.
Borjesson, P. and Read, A.J. (2003) Variation in timing of conception between populations of the harbor porpoise. Journal of Mammalogy 84, 948955.
Boschi, E.E. (1988) El ecosistema estuarial del Rio de la Plata. Instituto de Ciencias Marinas y Limnológicas de la Universidad Nacional Autónoma de México 15, 159182.
Botta, S., Müelbert, M.C., Secchi, E.R., Danilewicz, D., Negri, M.F., Cappozzo, H.L. and Hohn, A. (2010) Age and growth of Franciscana dolphin, Pontoporia blainvillei (Cetacea) incidentally caught off southern Brazil and northern Argentina. Journal of the Marine Biological Association of the United Kingdom 90, 14931500.
Cappozzo, H.L., Negri, M.F., Perez, F.H., Albareda, D., Monzon, J. and Corcuera, J.F. (2007) Incidental mortality of Franciscana dolphin (Pontoporia blainvillei) in Argentina. Latin American Journal of Aquatic Mammals 6, 127137.
Caswell, H., Brault, S., Read, A.J. and Smith, T.D. (1998) Harbor porpoise and fisheries: an uncertainty analysis of incidental mortality. Ecological Applications 8, 2261238.
Chivers, S.J., Dizon, A.E., Gearin, P.J. and Robertson, K.M. (2002) Small-scale population structure of eastern North Pacific harbour porpoises (Phocoena phocoena) indicated by molecular genetic analyses. Journal of Cetacean Research and Management 4, 111122.
Cerrato, R.M. (1990) Interpretable statistical tests for growth comparisons using parameters in the von Bertalanffy equation. Canadian Journal of Fisheries and Aquatic Sciences 47, 14161426.
Crespo, E.A., Harris, G. and González, R. (1998) Group size and distributional range of the Franciscana Pontoporia blainvillei. Marine Mammal Science 14, 845849.
Cunha, H.A., Medeiros, B.V., Barbosa, L.A., Cremer, M.J. and Marigo, J. (2014) Population structure of the endangered Franciscana dolphin (Pontoporia blainvillei): reassessing management units. PLoS ONE 9, e85633. doi: 10.1371/journal.pone.0085633.
Danilewicz, D. (2003) Reproduction of female Franciscana (Pontoporia blainvillei) in Rio Grande do Sul, Southern Brazil. Latin American Journal of Aquatic Mammals 2, 6778.
Danilewicz, D., Claver, J.A., Carrera, A.L.P., Secchi, E.R. and Fontoura, N.F. (2004) Reproductive biology of male Franciscanas (Pontoporia blainvillei) from Rio Grande do Sul. southern Brazil. Fishery Bulletin 102, 581592.
Danilewicz, D., Secchi, E.R., Ott, P.H., Moreno, I.B., Bassoi, M. and Borges-Martins, M. (2009) Habitat use patterns of Franciscana dolphins (Pontoporia blainvillei) off southern Brazil in relation to water depth. Journal of the Marine Biological Association of the United Kingdom 89, 943949.
Denuncio, P. (2012) Biología y conservación del delfín del Plata (Pontoporia blainvillei) en el sector costero bonaerense, PhD thesis. Universidad Nacional de Mar del Plata, Argentina.
Denuncio, P., Bastida, R., Danilewicz, D., Morón, S., Rodríguez Heredia, S. and Rodríguez, D. (2013) Calf chronology of the Franciscana dolphin: birth, lactation and onset on feeding ecology in coastal waters of Argentina. Aquatic Mammals 39, 7380.
Denuncio, P., Bastida, R., Dassis, M., Giardino, G., Gerpe, M. and Rodríguez, D. (2011) Plastic debris ingested by Franciscana dolphins, Pontoporia blainvillei. Marine Pollution Bulletin 62, 18361841.
Di Beneditto, A.P.M. and Ramos, R.M.A. (2001) Biology and conservation of the Franciscana (Pontoporia blainvillei) in the north of Rio de Janeiro State. Brazil. Journal of Cetacean Research and Management 3, 185192.
Gariboldi, M.C., Túnez, J.A., Dejean, C.B., Failla, M., Vitullo, A.D., Negri, M.F. and Cappozzo, H.L. (2015) Population genetics of Franciscana dolphins (Pontoporia blainvillei): introducing a new population from the southern edge of their distribution. PLoS ONE 10, e0132854. doi: 10.1371/journal.pone.0132854.
Gervais, P. and d'Orbigny, A. (1844) Mammalogie. ĹInstitut 12, 170.
Guerrero, R.A., Acha, E.M., Framiñan, M.B. and Lasta, C.A. (1997) Physical oceanography of the Rio de la Plata Estuary, Argentina. Continental Shelf Research 7, 727742.
Harrison, R.J., Bryden, M.M., McBrearty, D.A. and Brownell, R.L. Jr (1981) The ovaries and reproduction in Pontoporia blainvillei (Cetacea: Platanistidae). Journal of Zoology 193, 563580.
Hohn, A.A., Read, A.J., Fernandez, S., Vidal, O. and Findley, L.T. (1996) Life history of the vaquita, Phocoena sinus (Phocoenidae, Cetacea). Journal of Zoology 239, 235251.
Kasuya, T. and Brownell, R.L. Jr (1979) Age determination. reproduction and growth of the Franciscana dolphin, Pontoporia blainvillei. Scientific Reports of Whales Research Institute 31, 4567.
Mattson, M.C., Mullin, K.C. and Ingram, G.I. Jr (2006) Age structure and growth of the bottlenose dolphin (Tursiops truncatus) from strandings in the Mississippi sound region of the North-Central Gulf of Mexico from 1986 to 2003. Marine Mammal Science 22, 654666.
Mayr, E. (1970) Populations, species and evolution. Cambridge: The Belknap Press.
Mendez, M., Rossenbaum, H.C. and Bordino, P. (2008) Conservation genetics of the Franciscana dolphin in Northern Argentina: population structure, by-catch impacts, and management implications. Conservation Genetics 9, 419435.
Mendez, M., Rossenbaum, H.C., Subramaniam, A., Yackulic, C. and Bordino, P. (2010) Isolation by environmental distance in mobile marine species: molecular ecology of Franciscana dolphins at their southern range. Molecular Ecology 19, 22122228.
Messenger, S.L. and McGuire, J.A. (1998) Morphology, molecules and the phylogenetics of cetaceans. Systematic Biology 47, 90124.
Negri, M.F. (2010) Estudio de la biología y la ecología de la Franciscana. Pontoporia blainvillei, y su interacción con la pesquería costera en la Provincia de Buenos Aires. Argentina: Universidad de Buenos Aires.
Negri, M.F., Denuncio, P. and Cappozzo, H.L. (in press) Growth and sexual dimorphism of Franciscana dolphins, Pontoporia blainvillei, off southern Buenos Aires, Argentina. Journal of Mammalogy. Manuscript ID 14-MAMM-A-237.
Negri, M.F., Denuncio, P., Panebianco, M.V. and Cappozzo, H.L. (2012) Bycatch of Franciscana dolphins Pontoporia blainvillei and artisanal fisheries dynamic in the southernmost distribution of the species. Brazilian Journal of Oceanography 60, 151160.
Negri, M.F., Panebianco, M.V., Denuncio, P., Rodríguez, D. and Cappozzo, H.L. (2014) Biological parameters of Franciscana dolphins, Pontoporia blainvillei, by-caught in artisanal fisheries off southern Buenos Aires, Argentina. Journal of the Marine Biological Association of the United Kingdom 96, 82829. doi: 10.1017/S0025315414000393.
Norris, K.S. (1961) Standardized methods for measuring and recording data on the smaller cetaceans. Journal of Mammalogy 42, 471476.
Panebianco, M.V., Negri, M.F. and Cappozzo, H.L. (2012) Reproductive aspects of Franciscana dolphins (Pontoporia blainvillei) off Argentina. Animal Reproduction Science 131, 4148.
Perrin, W.F. and Myrick, A.C. Jr (1980) Age determination of toothed whales and sirenians. Reports of the International Whaling Commission (Special Issue) 3, 229 pp.
Pinedo, M.C. (1991) Development and variation of the Franciscana, Pontoporia blainvillei. PhD thesis. University of California, Santa Cruz, CA.
Pinedo, M.C. and Hohn, A.A. (2000) Growth layer patterns in teeth from the Franciscana, Pontoporia blainvillei: developing a model for precision in age estimation. Marine Mammal Science 16, 127.
Pineda, S.E., Aubone, A. and Brunetti, N.E. (1996) Identificación y morfometría comparada de las mandíbulas de Loligo gahi y Loligo sanpaulensis (Cephalopoda, Loliginidae) del Atlántico Sudoccidental. Revista de Investigación y Desarrollo Pesquero 10, 8599.
Ramos, R.M.A., Di Beneditto, A.P.M. and Lima, N.R.W. (2000) Growth parameters of Pontoporia blainvillei and Sotalia fluviatilis (Cetacea) in northern Rio de Janeiro. Brazil. Aquatic Mammals 26, 6575.
Reeves, R.R., Dalebout, M.L., Jefferson, T.A., Karczmarski, L., Laidre, K., O'Corry-Crowe, G., Rojas-Bracho, L., Secchi, E.R., Slooten, E., Smith, B.D., Wang, J.Y., Zerbini, A.N. and Zhou, K. (2008) Pontoporia blainvillei. In IUCN 2009. IUCN red list of threatened species. Version 2009.2. <>.
Ricker, W.E. (1975) Computation and interpretation of biological statistics of fish populations. Bulletin of the Fisheries Research Board of Canada 191, 1382.
Rodríguez, D., Rivero, L. and Bastida, R. (2002) Feeding ecology of the Franciscana (Pontoporia blainvillei) in estuarine and marine waters of northern Argentina. Latin American Journal of Aquatic Mammals 1, 7794.
Secchi, E.R., Danilewicz, D. and Ott, P.H. (2003) Applying the phylogeographic concept to identify Franciscana dolphin stocks: implications to meet management objectives. Journal of Cetacean Research and Management 5, 6168.
Secchi, E.R., Wang, J.Y., Murray, B.W., Rocha-Campos, C. and White, B.N. (1998) Population differentiation in the Franciscana (Pontoporia blainvillei) from two geographic locations in Brazil as determined from mitochondrial DNA control region sequences. Canadian Journal of Zoology 76, 16221627.
Secchi, E.R., Zerbini, A.N., Bassoi, M., Dalla, R.L., Möller, L.M. and Rocha-Campos, C.C. (1997) Mortality of Franciscanas, Pontoporia blainvillei in coastal gillnetting in southern Brazil: 1994–1995. Reports of the International Whaling Commission 47, 653658.
von Bertalanffy, L. (1938) A quantitative theory of organic growth (inquires on growth laws II). Human Biology 10, 181213.
Wells, R.S., Bordino, P. and Douglas, D.C. (2013) Patterns of social associations in the Franciscana, Pontoporia blainvillei. Marine Mammal Science 29, 567785.
Zullinger, E.M., Ricklefs, R.E., Redford, K.H. and Mace, G.M. (1984) Fitting sigmoidal equations to mammalian growth curves. Journal of Mammalogy 65, 607636.


Age and growth of Franciscana dolphins from northern Argentina

  • Pablo Denuncio (a1) (a2), María Fernanda Negri (a2) (a3), Ricardo Bastida (a1) (a2) and Diego Rodríguez (a1) (a2)


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