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Describing the Body Shapes of three populations of Sardinella lemuru (Bleeker, 1853) from Mindanao Island, Philippines Using Relative Warp Analysis

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Author Affiliations

  • 1Department of Biological Sciences, MSU-Iligan Institute of Technology, 9200 Iligan City, PHILIPPINES

Int. Res. J. Biological Sci., Volume 3, Issue (6), Pages 6-17, June,10 (2014)

Abstract

This study utilized landmark-based geometric morphometrics to determine and describe the body shape variation of Sardinella lemuru populations collected from the bays of Butuan City, Dipolog City, and Pagadian City in Mindanao, Philippines. A total of 30 males and 30 females from each sampling site were digitized and landmarked using 18 landmark points in the fish’s body. Relative warps (RW) for within and between populations were obtained. Significant results for variation between sexes were emphasized by multivariate analysis of variance (MANOVA), canonical variate analysis (CVA), and discriminant function analysis (DFA). RWs show that females exhibit body shapes that are geared to support large number of eggs (i.e. distended belly area) ensuring successful reproductive rate while males exhibit a more slender body and are generally smaller than females. Significant differences were also observed between populations of S. lemuru which can be attributed to geographic isolation permitting little to no interaction between populations. Environmental factors, overfishing/overexploitation could also be considered as factors influencing these morphological variations. Hence, this study showed that landmark-based geometric morphometric methods is an effective tool in describing body shape variations that exist within and between populations of S. lemuru. This initial method in distinguishing between populations is important in proper management of these species.

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