Title :

Morphological and genetic characterization of the invasive rayed pearl oyster Pinctada imbricata radiata (Mollusca: Bivalvia: Pteriidae) populations from contrasting environments along the Tunisian coast

Author(s) :

Hmida, Leila [Auteur]
Institut Supérieur de Biotechnologie de Monastir [ISBM]
Institut National Agronomique de Tunisie [INAT]
Université de Carthage (Tunisie) [UCAR]
Fassatoui, Chiheb [Auteur]
Institut National Agronomique de Tunisie [INAT]
Université de Carthage (Tunisie) [UCAR]
Missaoui, Sarra [Auteur]
Institut National Agronomique de Tunisie [INAT]
Université de Carthage (Tunisie) [UCAR]
Zaghab, Jihen [Auteur]
Institut Supérieur de Biotechnologie de Monastir [ISBM]
Institut National Agronomique de Tunisie [INAT]
Romdhane, Mohamed Salah [Auteur]
Institut National Agronomique de Tunisie [INAT]
Université de Carthage (Tunisie) [UCAR]
Le Loc’h, François [Auteur]
Laboratoire des Sciences de l'Environnement Marin (LEMAR) [LEMAR]
Ben Rais Lasram, Frida [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université du Littoral Côte d'Opale [ULCO]

Journal title :

Marine Biology Research

Pages :

200-214

Publisher :

Taylor & Francis

Publication date :

2021

ISSN :

1745-1000

English keyword(s) :

Bioinvasion
genetic diversity
connectivity
shell morphometry
population structure
environmental stress

HAL domain(s) :

Sciences du Vivant [q-bio]/Génétique/Génétique animale
Sciences de l'environnement/Biodiversité et Ecologie
Sciences du Vivant [q-bio]/Biologie animale/Zoologie des invertébrés
Sciences du Vivant [q-bio]/Génétique/Génétique des populations [q-bio.PE]

English abstract : [en]

To understand patterns of genetic and morphological variability, population structure and dispersal dynamics of the invasive bivalve Pinctada imbricata radiata (Leach, 1814) in Tunisian waters, we studied 200 individuals ...
Show more >To understand patterns of genetic and morphological variability, population structure and dispersal dynamics of the invasive bivalve Pinctada imbricata radiata (Leach, 1814) in Tunisian waters, we studied 200 individuals from five different sites (natural, polluted and/or subjected to environmental and anthropogenic pressures) using 10 enzymatic systems and six shell measurements. In this study, we attempt to elucidate the relationship between the spreading ability and the adaptive potential of the species under various environmental stresses. Fourteen putative enzyme-coding loci were resolved, six of which were polymorphic at the level of 99%. P. imbricata radiata maintains a relatively consistent level of polymorphism at the genetic markers studied, since 10% of individuals were heterozygous. The mean F IS value was positive and significant in two samples. However, the remaining samples collected from the disturbed marine sites (polluted, urban and lagoon areas) were at Hardy-Weinberg equilibrium. Highly significant genetic (mean F ST = 0.022, P < 0.001) and morphological (Wilks' lambda = 0.0814, approximate F 20, 627 = 35.484, P < 0.001) differentiations between samples were observed, with no evidence of isolation caused by geographic distance. However, the Mantel test performed between genetic and morphological distances revealed a significant correlation. Our results indicate that natural selection seems to have a greater influence on genetic differentiation in P. imbricata radiata than genetic drift. The combination of genetic and morphological data provided important theoretical information for determining the invasion mechanisms of the species.Show less >

Language :

Anglais

Popular science :

Non

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL