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Age and growth of franciscana (Pontoporia blainvillei) and Guiana dolphin (Sotalia guianensis) from coastal waters of southern São Paulo and northern Paraná states, Brazil

Grant number: 16/13839-7
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): March 01, 2017
Effective date (End): January 31, 2018
Field of knowledge:Physical Sciences and Mathematics - Oceanography - Biological Oceanography
Acordo de Cooperação: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Marcos César de Oliveira Santos
Grantee:Valéria Regina Martins Conversani
Host Institution: Instituto Oceanográfico (IO). Universidade de São Paulo (USP). São Paulo , SP, Brazil


Age estimation of individuals in a population is one of the most important tasks on investigating the life cycle aspects. The counting of growth layers groups (GLGs) technique has been deployed to estimate the age of cetacean odontocetes. These layers groups are regularly deposited on dentin and cementum layers of the teeth. In this context, this study aims to estimate the age and to obtain the growth parameters of the most accessible species of odontocetes on the Brazilian coast, the franciscana and the guiana dolphins. The specimens were found dead on the southern coast of São Paulo and northern coast of Paraná between 1995 and 2016. Teeth collected from 155 individuals of franciscana dolphin (86 males; 69 females) and 83 of guiana dolphin (37 males; 26 females; 20 undefined sex) will be analyzed. The method used to obtain the teeth's histological sections will follow an internationally standardized protocol and the both species' ages will be estimated by counting the number of GLGs. The growth parameters will be evaluated by means of mathematical functions and the growth curves will be adjusted for both males and females. These results will complement the database of the life history of both species population stocks which are still poorly known. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CONVERSANI, VALERIA R. M.; SILVA, DEBORA F.; BARBOSA, RODRIGO A.; HOHN, ALETA A.; SANTOS, MARCOS C. DE O.. Age and growth of franciscana, Pontoporia blainvillei, and Guiana, Sotalia guianensis, dolphins from southeastern Brazil. MARINE MAMMAL SCIENCE, v. 37, n. 2, . (16/13839-7)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
CONVERSANI, Valéria Regina Martins. Age and growth of franciscana dolphin (Pontoporia blainvillei) and Guiana dolphin (Sotalia guianensis) from coastal waters of southern São Paulo and northern Paraná. 2018. Master's Dissertation - Universidade de São Paulo (USP). Instituto Oceanográfico (IO/DIDC) São Paulo.

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