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Shell morphology and relative growth variability of the invasive pearl oyster Pinctada radiata in coastal Tunisia

Published online by Cambridge University Press:  09 December 2011

Amel Bellaaj-Zouari ,
Souheil Dkhili ,
Refka Gharsalli ,
Abdelkrim Derbali  and
Nejla Aloui-Bejaoui
Amel Bellaaj-Zouari*
Affiliation:
Institut National des Sciences et Technologies de la Mer, Centre La Goulette, Port de Pêche, 2060, Tunis, Tunisia
Souheil Dkhili
Affiliation:
Institut National des Sciences et Technologies de la Mer, Centre La Goulette, Port de Pêche, 2060, Tunis, Tunisia
Refka Gharsalli
Affiliation:
Institut National Agronomique de Tunisie, 43 Avenue Charles Nicolle, Tunis cité Marajéne, 1082, Tunisia
Abdelkrim Derbali
Affiliation:
Institut National des Sciences et Technologies de la Mer, Centre La Goulette, Port de Pêche, 2060, Tunis, Tunisia
Nejla Aloui-Bejaoui
Affiliation:
Institut National Agronomique de Tunisie, 43 Avenue Charles Nicolle, Tunis cité Marajéne, 1082, Tunisia
*
Correspondence should be addressed to: A. Bellaaj-Zouari, Institut National des Sciences et Technologies de la Mer, Centre La Goulette, Port de Pêche, 2060, Tunis, Tunisia email: amel.zouari@instm.rnrt.tn
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Abstract

The variability of shell morphology and relative growth of the invasive pearl oyster Pinctada radiata was studied within and among ten populations from coastal Tunisia using discriminant tests. Therefore, 12 morphological characters were examined and 34 metric and weight ratios were defined. In addition to the classic morphological characters, populations were compared by the thickness of the nacreous layer. Results of Duncan's multiple comparison test showed that the most discriminative ratios were the width of nacreous layer of right valve to the inflation of shell, the hinge line length to the maximum width of shell and the nacre thickness to the maximum width of shell. The analysis of variance revealed an important inter-population morphological variability. Both multidimensional scaling analysis and the squared Mahalanobis distances (D2) of metric ratios divided Tunisian P. radiata populations into four biogeographical groupings: the north coast (La Marsa); harbours (Hammamet, Monastir and Zarzis); the Gulf of Gabès (Sfax, Kerkennah Island, Maharès, Skhira and Djerba) and the intertidal area (Ajim). However, the Kerkennah Island population was discriminated by the squared Mahalanobis distances (D2) of weight ratios in an isolated group suggesting particular trophic conditions in this area. The allometric study revealed high linear correlation between shell morphological characters and differences in allometric growth among P. radiata populations. Unlike the morphological discrimination, allometric differentiation shows no clear geographical distinction. This study revealed that the pearl oyster P. radiata exhibited considerable phenotypic plasticity related to differences of environmental and/or ecological conditions along Tunisian coasts and highlighted the discriminative character of the nacreous layer thickness parameter.

Keywords

Pinctada radiatashell morphometricsrelative growthlessepsian migrationTunisia
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 92 , Issue 3 , May 2012 , pp. 553 - 563
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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