E-Locus - Institutional Repository of the University of Crete - Γενετική ανάλυση καλλιεργούμενων και άγριων πληθυσμών τσιπούρας (Sparus aurata) και λαβρακιού (Dicentrarchus labrax) και εντοπισμός διαφυγόντων ατόμων από τις ιχθυοκαλλιέργειες

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Identifier

000367205

Title

Γενετική ανάλυση καλλιεργούμενων και άγριων πληθυσμών τσιπούρας (Sparus aurata) και λαβρακιού (Dicentrarchus labrax) και εντοπισμός διαφυγόντων ατόμων από τις ιχθυοκαλλιέργειες

Alternative Title

Genetic analysis of farmed and wild populations of sea bass (Dichentrarchus labrax) and sea bream (Sparus auratus) and genetic identification of farm escapees

Author

Κουρκούνη, Ευαγγελία

Thesis advisor

Λαδουκάκης, Εμμανουήλ

Reviewer

Τσιγγενόπουλος, Κ.
Πουλακάκης, Ν

Abstract

The gilthead sea bream, Sparus aurata L. (Sparidae) and the European (or common) sea bass, Dicentrarchus labrax L. (Moronidae, Perciformes) represent two of the most important species for the aquaculture in Greece. Until some years ago, very little was known on the genetic structure of S. aurata. Some recent studies have depicted a picture of species subdivision, which, however, still needs to be clarified. European sea bass population differentiation is one of the best studied among European marine fish. In the present study, microsatellite markers were used to characterize genetically wild and farmed populations of Sparus aurata (sea bream) and Dicendrarchus labrax (sea bass) from western (Spain) and eastern (Greece) Mediterranean. Extensive polymorphism was detected for the genotyped microsatellite loci across all populations. Selective breeding programmes and founder effects have altered the composition of farmed populations leading to significant population differentiation between wild and cultured populations and lower genetic diversity in farmed populations. Based upon genetic data from 16 microsatellite markers, significant but highly variable differentiation was observed among the farmed and the wild samples, with pair-wise F_ST values ranging between 0.0162 and 0.1252, demonstrating the potential to detect genetic interactions between the samples. Heterozygosity deficiency is occurred in all samples for both species, except of the Greek farm population of the European sea bass. The Bayesian clustering indicated two main groups. Cluster 1 is consisted of Greek wild population and the two Spanish populations and cluster 2 is consisted of the Greek farmed population, for both of the species. Further Bayesian clustering in cluster 1, for the both species, display two groups. Spanish wild and farmed populations of sea bream are too mixed to be comfortable in genetic identification farmed-escaped in wild population. This study investigates the potential for the genetic identification of farmed- escaped sea bass and sea bream in the wild.

Language

Greek

Subject

Aquaculture

Breeding programme

Microsatellite markers

Population differentiation

Yδατοκαλλιέργεια

Γενετική αναγνώριση

Μικροδορυφορικοί δείκτες

Προγράμματα αναπαραγωγής

Issue date