Geographic and environmental variation in Bryconops sp. cf. melanurus (Ostariophysi: Characidae) from the Brazilian Pantanal

Geographic and environmental variation in Bryconops sp. cf. melanurus (Ostariophysi: Characidae) from the Brazilian Pantanal

Morphometric analyses of 220 specimens of a characid, Bryconops sp. cf. melanurus, from the Brazilian Pantanal were used to describe allometric growth in that species and determine whether specimens from highland habitats were more streamlined than those from lowland habitats. Relative warp analysis...

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Veröffentlicht in:Ichthyological research 2006-02, Vol.53 (1), p.24-33
Hauptverfasser: Sidlauskas, B.(University of Chicago (USA)), Chernoff, B, Machado-Allison, A
Format: Artikel
Sprache:eng
Schlagworte:
ANATOMIA ANIMAL
ANATOMIE ANIMALE
ANIMAL MORPHOLOGY
BIOLOGICAL DIFFERENCES
BRASIL
BRAZIL
BRESIL
Bryconops melanurus
CHARACIDAE
DIFERENCIAS BIOLOGICAS
DIFFERENCE BIOLOGIQUE
ENVIRONMENTAL FACTORS
FACTEUR DU MILIEU
FACTORES AMBIENTALES
Freshwater
GEOGRAFIA
GEOGRAPHIE
GEOGRAPHY
Ostariophysi
Principal components analysis
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Zusammenfassung:Morphometric analyses of 220 specimens of a characid, Bryconops sp. cf. melanurus, from the Brazilian Pantanal were used to describe allometric growth in that species and determine whether specimens from highland habitats were more streamlined than those from lowland habitats. Relative warp analysis of 14 landmarks and principal component analysis of 28 interlandmark distances returned complementary results. The increased streamlining of the highland specimens is highly consistent with known inductive effects of high water velocity on fish phenotypes. Genetic differentiation and inductive effects of temperature variation are also potential explanations of the observed phenotypic differentiation.
ISSN:1341-8998
1616-3915
DOI:10.1007/s10228-005-0310-6