Zoological Studies

Vol. 38 No. 3, 1999

Landmark-based Morphometric Analysis in Selected Species of Serranid Fishes (Perciformes: Teleostei)

Mauro José Cavalcanti1, Leandro Rabello Monteiro2 and Paulo Roberto Duarte Lopes3,*

1Departamento de Biologia Geral, Universidade Santa Úrsula, Rua Fernando Ferrari, 75, 22231-040, Rio de Janeiro, RJ, Brazil
2Departamento de Zoologia, Universidade Estadual Paulista, Caixa Postal 199, 13506-900, Rio Claro, SP, Brazil
3Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Campus Universitário, Km 3, BR-116, 44031-460, Ferira de Santana, BA, Brazil

Mauro José Cavalcanti, Leandro Rabello Monteiro and Paulo Roberto Duarte Lopes (1999) Morphological differences among 6 species of marine fishes belonging to 2 subfamilies of the family Serranidae (Serraninae: Dules auriga, Diplectrum formosum, and D. radiale; Epinephelinae: Epinephelus marginatus, Mycteroperca acutirostris, and M. bonaci) were studied by the geometric morphometric method of thin-plate splines and multivariate analysis of partial-warp scores. The decomposition of shape variation into uniform and nonaffine components of shape change indicate that major differences among species are related to both components of shape variation. Significant differences were found among species with respect to the uniform components, but there is no clear separation of taxonomic groups related to these components, and species are instead separated on the basis of body height and caudal peduncle length. Non-uniform changes in body shape, in turn, clearly differentiate the species of Serraninae and Epinephelinae. These shape changes are probably related to differences in habitat and feeding habits among the species.

Key words: Serranidae, Truss networks, Geometric morphometrics, Partial-warp scores, Multivariate analysis.