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Intraspecific Variation in Morphology and Sexual Dimorphism in Puntius singhala (Teleostei: Cyprinidae)

Author:

KB Suneetha Gunawickrama

Department of Zoology, Faculty of Science, University of Ruhuna, Matara, Sri Lanka, LK
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Abstract

Intraspecific morphological variation and differentiation among six populations of the endemic freshwater fish Puntius singhala (Cyprinidae) were investigated. There is significant sexual dimorphism in three morphometric characters (pectoral-fin length, caudal-peduncle length, and length of dorsal-fin base), where males have slightly longer measures than females, indicating adaptive significance related to dispersal. Significant heterogeneity and differentiation was found only among some of the populations studied (Wilk's λ for males = 0.079 and for females = 0.129) indicating limited geographic variation, as suggested by relatively large overlap in canonical scores among most of the samples. No significant correlation between the pair-wise differences and inter-locality geographic distances was found, thus isolation-by-distance was not a plausible explanation for the observed variation. The present results show that P. singhala is not phenotypically homogenous. The absence of differences between population samples that experience highly limited present-day interchange may be partly explained by colonization history.

Key words: Geographic variation, morphometry, multivariate analysis, population differentiation

doi: 10.4038/cjsbs.v37i2.504

Cey. J. Sci. (Bio. Sci.) 37 (2): 167-175, 2008

How to Cite: Gunawickrama, K.S., (2009). Intraspecific Variation in Morphology and Sexual Dimorphism in Puntius singhala (Teleostei: Cyprinidae). Ceylon Journal of Science (Biological Sciences). 37(2), pp.167–175. DOI: http://doi.org/10.4038/cjsbs.v37i2.504
Published on 17 Jun 2009.
Peer Reviewed

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