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Sexual Dimorphism in Body Shape of Hypseleotris Agilis (Herre, 1927) from Lake Lanao, Philippines

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Author Affiliations

  • 1Biology Department, Mindanao State University, Marawi City, PHILIPPINES
  • 2Department of Biological Sciences, MSU-Iligan Institute of Technology, 9200 Iligan City, PHILIPPINES
  • 3Department of Biological Sciences, MSU-Iligan Institute of Technology, 9200 Iligan City, PHILIPPINES

Int. Res. J. Biological Sci., Volume 1, Issue (2), Pages 25-31, June,10 (2012)

Abstract

H. agilis is an endemic species of fish from Lake Mai-init, Surigao del Norte, and introduce to Lake Lanao of Lanao del Sur sometime in the 1960s. The principal objective of this study is to describe the variations in morphology of the species as well as determine its sexually dimorphic traits, using landmark-based geometric morphometrics. A total of 55 (25 females and 30 males) specimens were analyzed. Twenty landmark points were digitized from which relative warp score were derived. Discriminant function analysis and thin-plate spline plot showed significant difference between body shape of the sexes with males exhibiting bigger head, along with elongated dorsal and anal fin bases. The bigger head of males relative to females could be a result of sexual selection, whereas, the elongated dorsal and anal fins could be a product of ecological/niche selection.

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