Body shape variation in the Characid Psalidodon rivularis from São Francisco river, Southeast Brazil (Characiformes: Stethaprioninae)

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 P. rivularis fro...

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Bibliographic Details
Published in:Acta zoologica (Stockholm) 2023-07, Vol.104 (3), p.345-354
Main Authors: Rodrigues‐Oliveira, Igor Henrique, Kavalco, Karine Frehner, Pasa, Rubens
Format: Article
Language:English
Subjects:
Allometry
Body height
Body shape
Cytogenetics
Endemic species
Fish
geometric morphometry
Height
Morphometry
Populations
Psalidodon
Recoil
Regression analysis
River basins
Rivers
Shape
shape modulation
suborbital plate
Water velocity
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Summary: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 P. rivularis 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.
ISSN:0001-7272
1463-6395
DOI:10.1111/azo.12415