Ontogenetic allometry of body shape in Serrasalmus brandti (Lütken, 1875) (Characiformes: Serrasalmidae)

  • Mauro José Cavalcanti Ecoinformatics Studio http://orcid.org/0000-0003-2389-1902
  • Jailza Tavares de Oliveira-Silva Universidade Estadual de Feira de Santana
  • Paulo Roberto Duarte Lopes Universidade Estadual de Feira de Santana

Resumo

The ontogenetic body shape changes in the white piranha, Serrasalmus brandti, were analyzed with geometric morphometrics techniques. The Cartesian coordinates of 16 anatomical landmarks were obtained from the external morphology of 133 specimens collected in 11 localities along the São Francisco River basin. The Procrustes-aligned landmark coordinates were used to construct shape variables. A multivariate regression of the shape variables on centroid size was determined to test the hypothesis of significant shape changes along ontogeny. The analysis showed statistically significant differences in shape with size (Goodall’s generalized test F[28, 3668] =  2.0175, p = 0.001), indicating that body shape in this species is not ontogenetically stable. Most of the ontogenetic shape changed observed in S. brandti occur in the anterior region of the body, and can be described by an increase in head length and a decrease in body depth in the larger specimens.

Biografia do Autor

Jailza Tavares de Oliveira-Silva, Universidade Estadual de Feira de Santana
Departamento de Ciências Biológicas (Museu de Zoologia - Divisão de Peixes)
Paulo Roberto Duarte Lopes, Universidade Estadual de Feira de Santana
Departamento de Ciências Biológicas (Museu de Zoologia - Divisão de Peixes)

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Publicado
2018-06-07