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Geometric Morphometric Analysis on Sexual Dimorphism of Guppy Poecilia reticulata in Lake Sebu, South Cotabato, Philippines

Author Affiliations

  • 1Department of Biology, College of Natural Sciences and Mathematics, Mindanao State University9500 General Santos City, PHILIPPINES
  • 2Department of Biology, College of Natural Sciences and Mathematics, Mindanao State University9500 General Santos City, PHILIPPINES
  • 3Department of Biology, College of Natural Sciences and Mathematics, Mindanao State University9500 General Santos City, PHILIPPINES
  • 4Department of Biology, College of Natural Sciences and Mathematics, Mindanao State University9500 General Santos City, PHILIPPINES
  • 5Department of Biology, College of Natural Sciences and Mathematics, Mindanao State University9500 General Santos City, PHILIPPINES

Res. J. Animal, Veterinary and Fishery Sci., Volume 3, Issue (1), Pages 1-9, January,24 (2015)

Abstract

Poecilia reticulata is an introduced species in the Philippines which is a native species of Brazil, Guyana, Venezuela, and the Caribbean Islands. It is commonly known as guppy (Peter, 1860). The principal objective of this study is to describe the variations in morphology of the species as well as identify its sexually dimorphic traits using Geometric Morphometric Analysis. A total of 60 (30 males and 30 females) specimens were analysed and fourteen (14) landmark points were digitized in each sample. Relative Warp Analysis (RWA) (Rohlf 2008) was used and scores were subjected to Discriminant Function Analysis (DFA) and Multivariate Analysis of Variance (MANOVA) and Canonical Variate Analysis (CVA) of PAST software (Hammer et al., 2009) to determine the substantial variance between body shapes and sexual dimorphism of P. reticulata. The result in the DFA showed substantial variance between body shape of the sexes with females exhibiting wider dentary, along with bloated abdomen. On the other hand, males exhibit more elongated jaw region, posterior anal and ventral caudal fin. The CVA scatterplots also illustrated the sexual dimorphism in the body shape of P. reticulata. that shows no overlapping of plots which remarkably discriminated (separated) the male from female. With the results derived, sexual dimorphism of P. reticulata with the variation of its morphological structure is determined through the Application of Geometric Morphometrics.

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