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Body shape variation in the Characid Psalidodon rivularis from São Francisco river,Southeast Brazil (Characiformes: Stethaprioninae)
Authors:Igor Henrique Rodrigues-Oliveira  Karine Frehner Kavalco  Rubens Pasa
Institution:1. Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil;2. Laboratório de Genética Ecológica e Evolutiva, Universidade Federal de Viçosa Campus Rio Paranaíba, Rio Paranaíba, MG, Brazil
Abstract:Psalidodon rivularis is a species of tetra endemic to the São Francisco River basin and, based on cytogenetic and molecular studies, represents a complex of species. The objective of the present work was to identify morphological differences in the body shape of seven populations of Privularis from the Upper and Middle São Francisco River basin through geometric morphometry. In all, we photographed 174 individuals on the right side of the body and 17 landmarks were digitized on each image. To study the effects of allometry on the shape, we performed regression analysis and, to study shape modulation at different collection points and sub-basins, the canonical variation analyses. We found differences in shape between collection points and sub-basins associated with relative body height and sub-orbital plate recoil, in addition to a significant influence of size on specimen shape (allometry) associated with the ventral skull, orbits and sub-orbital plate. We do not envision differences in body shape between males and females. Several works with fish relate body height with water velocity, while the sub-orbital plate recoil shows a taxonomic or ecological potential, marking the main difference between the populations of the Upper and Middle São Francisco River.
Keywords:allometry  body height  geometric morphometry  shape modulation  suborbital plate
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