Body shape and size divergence among populations of Poecilia vivipara in coastal lagoons of south-eastern Brazil

Geometric shape analyses were used to study body shape and size variation among populations of the livebearing fish Poecilia vivipara inhabiting the recently formed coastal lagoons of Grussaí and Iquipari in Northern Rio de Janeiro State, Brazil. The largest components of morphological variation amo...

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Bibliographic Details
Published in:Journal of fish biology 2003-10, Vol.63 (4), p.928-941
Main Authors: Neves, F. M., Monteiro, L. R.
Format: Article
Language:English
Subjects:
Agnatha. Pisces
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
body shape
Brackish
Fundamental and applied biological sciences. Psychology
geometric morphometrics
locomotion
Poecilia vivipara
sexual dimorphism
spatial variation
Vertebrata
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Summary:Geometric shape analyses were used to study body shape and size variation among populations of the livebearing fish Poecilia vivipara inhabiting the recently formed coastal lagoons of Grussaí and Iquipari in Northern Rio de Janeiro State, Brazil. The largest components of morphological variation among females were between different habitats in the same lagoon, whereas for males there were larger differences between lagoons than between habitats. The shape differences were mostly localized in the head region and midbody, which indicated different patterns of locomotion and foraging behaviour optimized for the habitat experienced by each population. The pattern of size variation was similar to that of size‐independent shape variation.
ISSN:0022-1112
1095-8649
DOI:10.1046/j.1095-8649.2003.00199.x