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Age and growth of Franciscana dolphins from northern Argentina

Published online by Cambridge University Press:  30 May 2017

Pablo Denuncio ,
María Fernanda Negri ,
Ricardo Bastida  and
Diego Rodríguez
Pablo Denuncio*
Affiliation:
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 Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
María Fernanda Negri
Affiliation:
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina Laboratorio de Ecología y Conservación de Vida Silvestre, Centro Austral de Investigaciones Científicas (CONICET), Houssay 200 (9410), Ushuaia, Tierra del Fuego, Argentina
Ricardo Bastida
Affiliation:
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 Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Diego Rodríguez
Affiliation:
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 Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
*
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: pdenunci@mdp.edu.ar
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Abstract

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.

Keywords

Pontoporia blainvilleiagegrowth curvesFranciscana Management AreasconservationArgentina
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 98 , Special Issue 5: Marine Mammals , August 2018 , pp. 1197 - 1203
Copyright
Copyright © Marine Biological Association of the United Kingdom 2017 

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