Genetic structure of populations of the bryozoan Myriapora truncata, builder and component of the Coralligenous

by Dubois S., David R., Ereskovsky A., Erga Z., Chenuil A., and Féral J.-P.
Thursday 24 April 2014
by  Jean Pierre FERAL
popularity : 3%

JPEG - 54.5 kb The Coralligenous habitat? is a whole set of Mediterranean ecosystems and habitats which are important in terms of complexity and biodiversity. It provides protection and a feeding area for many species. In this context, the European program CIGESMED studies the Good Environmental Status of this habitat focusing on the ecology and the genetic of biobuilders species. Myriapora truncata is an erect and robust bryozoan which is found throughout the coralligenous and which participate in its bio-construction. The aim of the study is to gain knowlegde of population structure of this species analysing the intraspecific diversity and their connectivity.
For this, we used mitochondrial and nuclear genetic markers on about thirty samples collected on different sites and different ecologic profiles throughout the Mediterranean Sea. We used the sequenced data to study (i) the phylogeny of Myriapora truncata and maybe check for cryptic species? (despite of the supposed low dispersion of the larvae, it is found throughout the Mediterranean Sea), (ii) its phylogeography? in order to understand its distribution area and know if there are hydrogeographic barriers between the Western and Eastern Mediterranean Sea, (iii) the connectivity to know if the ecologic parameters impact on the population structure.
The analysis of the mitochondrial marker COI gave its first results. We found three different haplotype groups near Marseilles : a main group found in all studied locations, an haplotype group found only in Méjean and another one found exclusively in Cassidaigne, and it could be cryptic species.We are also using SEM to check for specific differences of structure between the different haplotype groups.

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