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Describing shell shapes of Venerid bivalves using elliptic fourier analysis

By: Mark Lloyd Dapar, Sharon Rose Tabugo

Key Words: Veneridae, CVA, MANOVA, Variation, Elliptic Fourier Analysis.

Int. J. Biosci. 12(1), 82-89, January 2018.


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In this study, Elliptic Fourier (EF) analysis was used to describe phenotypic variation among the selected venerid bivalve species Meretrix lyrata (lyrate asiatic hard clam), Chamelea striatula (striped venus clam) and Tapes dorsatus (turgid venus clam). Thus, to describe possible phenotypic diversity, a total of 90 venerid bivalves (30 specimens for each species) were photographed on their right valves. Canonical variate analysis (CVA), multivariate analysis of variance (MANOVA), principal component analysis (PCA) and Kruskal-Wallis tests showed significant difference between species based on the Fourier coefficients. This study showed significant variations in the shape of the right external valve of the shell. CVA plot generated show separation of populations examined indicating significant difference between groups. Observed differences in the external shell shapes of different venerid bivalve species were based in the umbo, anterior margin, shell width, length depth and anterior margin depression. Results suggest hypothesized variable factors behind the disparity of the external shell shape which include habitat differences, environment and genotype interactions. Herewith, the use of Elliptic Fourier (EF) analysis proved to be useful in effective quantification of inter-specific variation between species.

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Describing shell shapes of Venerid bivalves using elliptic fourier analysis

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Mark Lloyd Dapar, Sharon Rose Tabugo.
Describing shell shapes of Venerid bivalves using elliptic fourier analysis.
Int. J. Biosci. 12(1), 82-89, January 2018.
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