Crescimento e desenvolvimento de boto-cinza (Sotalia guianensis) do litoral do Espírito Santo

Carvalho, Anna Paula Martins de; Ywasaki, Juliana; Azevedo, Carolina Torres; Campos, A. S.; Queiroz, Fábio Ferreira de; Pontes, Laranja; Barbosa, Lupércio A.; Silveira, Leonardo Serafim da

doi:10.1590/s0102-09352012000100029

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“…So far, no data have been published about estuarine dolphins in the state of Espírito Santo, Brazil. However, Carvalho et al [9] report that mean TL of individuals older than seven years of age found in this state is 187.5 cm.…”

Section: Introductionmentioning

confidence: 80%

Ossification Pattern of Estuarine Dolphin (Sotalia guianensis) Forelimbs, from the Coast of the State of Espírito Santo, Brazil

et al. 2015

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The estuarine dolphin, Sotalia guianensis, is one of the most abundant cetacean species in Brazil. Determination of age and of aspects associated with the development of this species is significant new studies. Counts of growth layer groups in dentin are used to estimate age of these animals, though other ways to evaluate development are also adopted, like the measurement of total length (TL). This study presents a procedure to evaluate the development of the estuarine dolphin based on the ossification pattern of forelimbs. Thirty-seven estuarine dolphins found in the state of Espírito Santo, Brazil, were examined. Age was estimated, TL was measured and ossification of epiphyses was examined by radiography. We analyzed results using the Spearman correlation. Inspection of radiographs allowed evaluation of the significance of the correlation between age and development of the proximal (r = 0.9109) and distal (r = 0.9092) radial epiphyses, and of the distal ulnar epiphyses (r = 0.9055). Radiographic analysis of forelimbs proved to be an appropriate method to evaluate physical maturity, and may be a helpful tool to estimate age of these animals in ecological and population studies.

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Section: Introductionmentioning

confidence: 80%