Genetic variability in the Sardinian population of the manila clam, Ruditapes philippinarum

Genetic variability in the Sardinian population of the manila clam, Ruditapes philippinarum

The genetic variability of microsatellites was investigated among allochthonous populations of Ruditapes philippinarum (Bivalvia, Veneridae) at six sites in the Gulf of Olbia (North-East Sardinia) and one site in the Lagoon of Sacca di Goro (North Adriatic Sea). Our results demonstrate the lack of g...

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Bibliographic Details
Published in:Biochemical systematics and ecology Vol. 41; pp. 74 - 82
Main Authors: Mura, L., Cossu, P., Cannas, A., Scarpa, F., Sanna, D., Dedola, G.L., Floris, R., Lai, T., Cristo, B., Curini-Galletti, M., Fois, N., Casu, M.
Format: Journal Article
Language:English
Published: Elsevier Ltd 01-04-2012
Subjects:
Biological invasion
Bivalvia
clams
founder effect
genes
genetic drift
Genetic variability
genetic variation
Introduced species
Manila clam
microsatellite repeats
Ruditapes philippinarum
Veneridae
MED, Italy, Sardegna
MED, Adriatic Sea
MED, Italy, Emilia-Romagna, Ferrara, Po Delta, Sacca di Goro
Manila clam
Biological invasion
Introduced species
Genetic variability
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Summary:The genetic variability of microsatellites was investigated among allochthonous populations of Ruditapes philippinarum (Bivalvia, Veneridae) at six sites in the Gulf of Olbia (North-East Sardinia) and one site in the Lagoon of Sacca di Goro (North Adriatic Sea). Our results demonstrate the lack of genetic substructuring of R. philippinarum populations within the Gulf of Olbia. Furthermore, we found highly similar estimates of within-population genetic variability without evidence of genetic differentiation between Sardinian and Adriatic populations. The lack of a signature of a founder effect in the Sardinian samples, notwithstanding their recent introduction, indicates that the number of R. philippinarum individuals released into the Gulf of Olbia may have been high enough to reduce the loss of genetic variability due to genetic drift. Furthermore, the absence of genetic differentiation observed between samples from the two areas suggests that the two populations belong to the same gene pool. Our results also indicated that R. philippinarum is rapidly colonizing the Gulf of Olbia and the neighboring areas, which is likely favored by its high potential for dispersal. ► We analyzed 7 R. philippinarum samples, 6 from NE Sardinia and 1 from N Adriatic. ► We surveyed the genetic variability at six microsatellite loci. ► We found lack of genetic population substructuring within the NE Sardinia. ► Lack of differentiation between the two areas suggests a common gene pool of origin. ► Concerns arise for the conservation in NE Sardinia of the autochthonous R. decussatus.
Bibliography:http://dx.doi.org/10.1016/j.bse.2011.11.002
ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0305-1978
1873-2925
DOI:10.1016/j.bse.2011.11.002