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Morphological variations of striped seabream, Lithognathus mormyrus, populations along the Tunisian coast

Published online by Cambridge University Press:  14 March 2011

Ibtissem Hammami ,
Lilia Bahri-Sfar  and
Oum Kalthoum Ben Hassine
Ibtissem Hammami
Affiliation:
Research Unit of Biology, Ecology and Parasitology of Aquatic Organisms, Department of Biology, Faculty of Science of Tunis, University Campus, El Manar, 2092 Tunis, Tunisia
Lilia Bahri-Sfar
Affiliation:
Research Unit of Biology, Ecology and Parasitology of Aquatic Organisms, Department of Biology, Faculty of Science of Tunis, University Campus, El Manar, 2092 Tunis, Tunisia
Oum Kalthoum Ben Hassine*
Affiliation:
Research Unit of Biology, Ecology and Parasitology of Aquatic Organisms, Department of Biology, Faculty of Science of Tunis, University Campus, El Manar, 2092 Tunis, Tunisia
*
Correspondence should be addressed to: O.K. Ben Hassine, Research Unit of Biology, Ecology and Parasitology of Aquatic Organisms, Department of Biology, Faculty of Science of Tunis, University Campus, El Manar, 2092 Tunis, Tunisia email: [email protected]
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Abstract

Morphological variations of Tunisian Lithognathus mormyrus populations were investigated using 41 morphometric measurements (27 truss elements and 14 traditional measurements) and eight meristic characters collected from ten marine and lagoon samples. Statistical analyses (e.g. discriminant function analysis (DFA)) performed separately to truss and traditional data revealed a significant degree of morphological dissimilarity of lagoon samples (Bizerta, Ghar El Melh and El Biban lagoons). For these three lagoon environments the overall assignment of individuals into their original sample (percentage classification success) by DFA was 94% for truss elements and 98% for traditional measurements. This morphological discrimination among lagoon samples, revealed with traditional measurements, seems to be associated only with the anterior part of the body (especially with the pre-orbit and snout length). However, for truss analyses, it was explained by both anterior and posterior parts (peduncle region). Statistical analyses for only marine samples showed partial overlapping with significant morphometric variation of the Chebba and Gabès samples mainly related to the anterior part of the body, for the first sample, but also to the posterior region, for the second one. These morphometric variations are often due to environmental conditions and mainly to the exploitation of different ecological niches that are particularly limited by the availability, type and size of prey. Thus, truss and traditional approaches are complementary and provide more accurate explanations of such a morphological discrimination. Meristic character analyses showed homogeneity of striped seabream samples, except for the Ghar El Melh lagoon sample which quietly differed from the others. This distinction was mainly explained by the number of soft anal rays.

Keywords

striped seabreamLithognathus mormyrusmorphological variationstruss approachmeristic characters
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 91 , Special Issue 6: Fish Ecology , September 2011 , pp. 1261 - 1271
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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