Repositório Digital

A- A A+

Habitat use patterns of franciscana dolphins (Pontoporia blainvillei) off southern Brazil in relation to water depth

.

Habitat use patterns of franciscana dolphins (Pontoporia blainvillei) off southern Brazil in relation to water depth

Mostrar registro completo

Estatísticas

Título Habitat use patterns of franciscana dolphins (Pontoporia blainvillei) off southern Brazil in relation to water depth
Autor Danilewicz, Daniel
Secchi, Eduardo Resende
Ott, Paulo Henrique
Moreno, Ignacio Maria Benites
Bassoi, Manuela
Martins, Márcio Borges
Abstract The patterns of habitat use by the franciscana dolphins (Pontoporia blainvillei) along its distribution are poorly known. This study investigates the patterns of habitat use with respect to depth for 181 individuals of different age, size, gender and reproductive condition off Rio Grande do Sul, southern Brazil. The results reveal that franciscanas are very homogeneously distributed according to depth. Individuals from all lengths utilize nearly the entire range of depths of the surveyed area. Larger or older animals do not use deeper waters than younger animals, indicating that body size and age are not limiting factors for franciscanas that occupy deeper or offshore waters. Gestation seems to not cause a change in the distribution of females Although the sex-ratio of the overall data did not vary from 1:1 in different depth intervals, a small-scale comparison between the northern and southern coast demonstrated the existence of some kind of sexual segregation. Franciscana by-catch in Rio Grande do Sul is not sustainable and it is agreed that management procedures are needed. Nevertheless, the available data on species distribution do not allow the designing of a protected area in order to minimize the by-catches of a particular sex/reproductive class.
Contido em Journal of the Marine Biological Association of the United Kingdom. Cambridge, Inglaterra. Vol. 89, no. 5 (Aug. 2009), p. 943-949
Assunto Biologia marinha
Captura acidental na pesca
Habitat
Pontoporia blainvillei
Rio Grande do Sul, Litoral
[en] Habitat use
[en] Incidental catches
[en] Pontoporia blainvillei
[en] Sex-ratio
[en] Southern Brazil
[en] Water depth
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/27463
Arquivos Descrição Formato
000720561.pdf (213.3Kb) Texto completo Adobe PDF Visualizar/abrir

Este item está licenciado na Creative Commons License

Este item aparece na(s) seguinte(s) coleção(ões)


Mostrar registro completo

Percorrer



  • O autor é titular dos direitos autorais dos documentos disponíveis neste repositório e é vedada, nos termos da lei, a comercialização de qualquer espécie sem sua autorização prévia.
    Projeto gráfico elaborado pelo Caixola - Clube de Criação Fabico/UFRGS Powered by DSpace software, Version 1.8.1.