No evidence for genetic differentiation of the mussel Mytilus galloprovincialis between lagoons and the seaside

Skalamera, J.-P.; Renaud, François; Raymond, M.; Meeûs, Thierry De

doi:10.3354/meps178251

Cited by 11 publications

(6 citation statements)

References 24 publications

(32 reference statements)

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“…Sea-lagoon genetic connectivity is poorly documented in the Gulf of Lion. To our knowledge, fine-scale genetic structure among lagoons in this area was investigated, in bivalve species, only for Ruditapes decussatus 71 and Mytilus galloprovincialis 72 and, similarly to the present study for P. nobilis , no genetic differentiation could be identified. Similar results were also found for the sand goby Pomatoschistus minutus 73 .…”

Section: Discussionsupporting

confidence: 49%

Genetic homogeneity of the critically endangered fan mussel, Pinna nobilis, throughout lagoons of the Gulf of Lion (North-Western Mediterranean Sea)

Peyran

Boissin

Morage

et al. 2021

Sci Rep

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The fan mussel, Pinna nobilis, endemic to the Mediterranean Sea, is a critically endangered species facing mass mortality events in almost all of its populations, following the introduction of the parasite Haplosporidium pinnae. Such a unique pandemic in a marine organism, which spreads rapidly and with mortality rates reaching up to 100%, could lead to the potential extinction of the species. Only few regions, involving lagoon habitats, remain healthy throughout the entire Mediterranean Sea. This study describes the genetic structure of P. nobilis across the Gulf of Lion, including confined locations such as lagoons and ports. A total of 960 samples were collected among 16 sites distributed at 8 localities, and then genotyped using 22 microsatellite markers. Genetic diversity was high in all sites with mean allele numbers ranging between 10 and 14.6 and with observed heterozygosities (Ho) between 0.679 and 0.704. No genetic differentiation could be identified (FST ranging from 0.0018 to 0.0159) and the percentages of related individuals were low and similar among locations (from 1.6 to 6.5%). Consequently, all fan mussels, over the entire coastline surveyed, including those in the most geographically isolated areas, belong to a large genetically homogeneous population across the Gulf of Lion. Considering the ongoing mass mortality context, this result demonstrates that almost all of the genetic diversity of P. nobilis populations is still preserved even in isolated lagoons, which might represent a refuge habitat for the future of the species.

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Section: Discussionsupporting

confidence: 49%

Genetic homogeneity of the critically endangered fan mussel, Pinna nobilis, throughout lagoons of the Gulf of Lion (North-Western Mediterranean Sea)

Peyran

Boissin

Morage

et al. 2021

Sci Rep

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“…1980b; Hilbish & Koehn 1985). Differences between estuarine and oceanic populations have also been reported at the Lap locus in M. trossulus (McDonald & Siebenaller 1989), M. galloprovincialis (Gardner & Kathiravetpillai 1997; Gardner & Palmer 1998; see, however, Škalamera et al . 1999), Mercenaria mercenaria (Koehn et al .…”

Section: Discussionmentioning

confidence: 94%

Range‐wide genetic homogeneity in the California sea mussel (Mytilus californianus): a comparison of allozymes, nuclear DNA markers, and mitochondrial DNA sequences

et al. 2008

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We tested for genetic differentiation among six populations of California sea mussels (Mytilus californianus) sampled across 4000 km of its geographical range by comparing patterns of variation at four independent types of genetic markers: allozymes, single-copy nuclear DNA markers, and DNA sequences from the male and female mitochondrial genomes. Despite our extensive sampling and genotyping efforts, we detected no significant differences among localities and no signal of isolation by distance suggesting that M. californianus is genetically homogeneous throughout its range. This concordance differs from similar studies on other mytilids, especially in the role of postsettlement selection generating differences between exposed coastal and estuarine habitats. To assess if this homogeneity was due to M. californianus not inhabiting estuarine environments, we reviewed studies comparing allozymes with other classes of nuclear DNA markers. Although both types of markers gave broadly consistent results, there was a bias favouring studies in which allozymes were more divergent than DNA markers (nine to three) and a disproportionate number of these cases involved marine taxa (seven). Furthermore, allozymes were significantly more heterogeneous than DNA markers in three of the four studies that sampled coastal and estuarine habitats. We conclude that the genetic uniformity exhibited by M. californianus may result from a combination of extensive gene flow and the lack of exposure to strong selective gradients across its range.

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“…Four of the seven species or species sub-groups showed higher levels of divergence at a large scale, and three of the five species or species sub-groups showed a higher level of divergence at a small scale. The lack of genetic divergence in some of the species with a medium or high dispersal capability is not unexpected, as these species are very rarely subdivided at a large geographical scale and many species show no genetic differentiation among estuarine populations or between estuarine and nearby marine populations (Skalamera et al 1999). However, some species with a high capability for dispersal do contain unique alleles or show genetic divergence among populations, and these divergent populations are often those from estuaries or enclosed embayments (e.g.…”

Section: Discussionmentioning

confidence: 96%

Estuaries, lagoons and enclosed embayments: habitats that enhance population subdivision of inshore fishes

Watts

Johnson

2004

Mar. Freshwater Res.

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Several studies have suggested that estuaries, lagoons and enclosed embayments may offer special opportunities for local subdivision in marine species. We used data from published papers and unpublished theses to examine the effect of such water bodies on allozyme differentiation of seven species of inshore fishes in Western Australia. We included species that differ in their dispersal, and hence their intrinsic potential for gene flow. Over large distances, subdivision was generally greater among estuarine populations than among conspecific marine populations collected over similar distances. Over small distances, paired marine and estuarine samples were generally more divergent than pairs of marine samples separated by similar distances. For species with a low capability for dispersal, estuaries appear to add to the high levels of genetic subdivision that commonly result from other factors. Under special circumstances estuaries may also provide opportunities for genetic divergence in species with a high capability of dispersal that are rarely subdivided at a large geographical scale. These observations indicate that estuaries can increase the genetic subdivision of populations of inshore fishes, and that species that use both marine and estuarine habitats are likely to have greater genetic subdivision than those that are restricted to marine habitats.

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No evidence for genetic differentiation of the mussel Mytilus galloprovincialis between lagoons and the seaside

Cited by 11 publications

References 24 publications

Genetic homogeneity of the critically endangered fan mussel, Pinna nobilis, throughout lagoons of the Gulf of Lion (North-Western Mediterranean Sea)

Genetic homogeneity of the critically endangered fan mussel, Pinna nobilis, throughout lagoons of the Gulf of Lion (North-Western Mediterranean Sea)

Range‐wide genetic homogeneity in the California sea mussel (Mytilus californianus): a comparison of allozymes, nuclear DNA markers, and mitochondrial DNA sequences

Estuaries, lagoons and enclosed embayments: habitats that enhance population subdivision of inshore fishes

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