Preliminary data on the genetic differentiation of Mytilus desolationis Lamy 1936 and Aulacomya ater regia Powell 1957 (Bivalvia, mytilidae) in the Kerguelen Islands (Terres Australes et Antarctiques Fran�aises)

Blot, Michel; Soyer, Jacques; Thiriot-Quiévreux, Catherine

doi:10.1007/bf00286818

Cited by 9 publications

(11 citation statements)

References 19 publications

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“…The correspondence analysis suggests th.at the same allozymes at the LAP locus are involved in the parallel differentiation within M. desolationis, M. galloprovincialis and M. edulis (at least between Long Island, New Bristol and Woods Hole) and that the same molecular mechanisms may occur within each taxon. The level of local differentiation between neighboring populahons, previously observed in Kerguelen (Blot et al 1987), may indicate that, because of the large variety of biotopes of these islands (Arnaud 1974, Lawrence et al 1987, populations of Mytjlus are subjected to higher selective forces and/or greater isolation from one another. An analysis of a large collection from populations occurring in a variety of environments is presently undenvay to test these hypothetical statements.…”

Section: Discussionmentioning

confidence: 89%

“…To appreciate the level of enzymatic polymorphism of the little-known taxon Mytilus desolationis, 1000 individuals, of a size ranging from 2 to 90 mm, were collected at low tide in different locations in the Kerguelen Islands (see Blot et al 1987 for description of locations).…”

Section: Electrophoretic Mobilitiesmentioning

confidence: 99%

“…For Mytilus desolationis, 2 populations, each characterizing one of the 2 genetical groups previously demonstrated (Blot et al 1987) were chosen: 80 adult mussels (60 to 80 mm length) were collected at low tide in January 1986 in Bossiere Fjord (Gulf of Morbihan; mussel bank sheltered from western swells, with lower salinity than that of open sea) and Larose Bay (external coast; mussels in crevices of exposed rocks and in intertidal pools with ocean salinity).…”

Section: Allozyme Frequenciesmentioning

confidence: 99%

“…2 is the more anodal (Ahmad & Beardmore 1976). Following this rule, the LAPl and LAP2 previously desclibed in Blot et al (1987) are now named LAP2 and LAPl respectively. Twenty-nine standard electromorphs were observed at the 12 loci in the 1000 specimens of Mytilus desolationis analysed.…”

Section: Electrophoretic Rnobilitiesmentioning

confidence: 99%

“…Electrophoretic polymorphlsm and allozyme frequencies at 10 loci have been previously studied in 4 populations of M, desolationis which comprise 2 genetically different groups, one in the large Gulf of Morbihan, the other along the external coasts of the archipelago (Blot et al 1987). Contingent genetic specificities of M. desolationis must now be sought to determine the level of endemism of this marine benthic organism, drastically isolated from any continents in a subantarctic insular system.…”

Section: Introductionmentioning

confidence: 99%

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Genetic relationships among populations of Mytilus desolationis from Kerguelen, M edulis from the North Atlantic and M. gallo-provincialis from the Mediterranean

Blot¹,

Thiriot-Quiévreux²,

Soyer³

1988

Mar. Ecol. Prog. Ser.

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The mussel M w u s desolationis Lamy 1936, which constitutes large populations in the Kerguelen Islands, a highly isolated archipelago, is generally considered an endemic species on the basis of morphological data. Cross-matching of electromorphs of M. desolationis with those of M eduljs and M. galloprovinciaLis demonstrated that the 29 electromorphs recorded in M. desolahonis at 12 loci were identified in the 38 electromorphs observed in European populations at the same loci. Nine rare electromorphs are lacking in the Kerguelen mussel but no diagnostic locus was detected in the present study. Allozyrnic frequencies at 10 enzymahc loci from 2 populations of M. desolationis are analysed and compared with the data of Skibinslu et al. (1980Skibinslu et al. ( , 1983 on 4 populations of M. eduLis and 3 populations of M. galloprovmcialis. Correspondence analysis shows that 2 levels of allozymic frequency vanations can be distlngushed among the 9 populations: one level corresponding to a 'taxonomic' differentiation among these forms, the other corresponding to a population level within the taxa and more related to the environment. A phenogram illustrate< genetic re!zt;onships amcng h.l: dcso!;ci'oi;is, X. g & o p~u v i~~-cialis and M. edulis, and the level of isolation of M. desolationis is discussed in terms of rare allozymes. Results suggest identification of M. desolationis as a semi-species in the super-species Mytilus edulis, inhabiting a low gene flow environment and subjected to high selective pressure.

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Section: Discussionmentioning

confidence: 89%

Section: Electrophoretic Mobilitiesmentioning

confidence: 99%

Section: Allozyme Frequenciesmentioning

confidence: 99%

Section: Electrophoretic Rnobilitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Genetic relationships among populations of Mytilus desolationis from Kerguelen, M edulis from the North Atlantic and M. gallo-provincialis from the Mediterranean

Blot¹,

Thiriot-Quiévreux²,

Soyer³

1988

Mar. Ecol. Prog. Ser.

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Does natural selection explain the fine scale genetic structure at the nuclear exon Glu‐5′ in blue mussels from Kerguelen?

Gérard

Roby

Bierne

et al. 2015

Ecology and Evolution

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The Kerguelen archipelago, isolated in the Southern Ocean, shelters a blue mussel Mytilus metapopulation far from any influence of continental populations or any known hybrid zone. The finely carved coast leads to a highly heterogeneous habitat. We investigated the impact of the environment on the genetic structure in those Kerguelen blue mussels by relating allele frequencies to habitat descriptors. A total sample comprising up to 2248 individuals from 35 locations was characterized using two nuclear markers, mac-1 and Glu-5′, and a mitochondrial marker (COI). The frequency data from 9 allozyme loci in 9 of these locations were also reanalyzed. Two other nuclear markers (EFbis and EFprem's) were monomorphic. Compared to Northern Hemisphere populations, polymorphism in Kerguelen blue mussels was lower for all markers except for the exon Glu-5′. At Glu-5′, genetic differences were observed between samples from distinct regions (FCT = 0.077), as well as within two regions, including between samples separated by <500 m. No significant differentiation was observed in the AMOVA analyses at the two other markers (mac-1 and COI). Like mac-1, all allozyme loci genotyped in a previous publication, displayed lower differentiation (Jost's D) and FST values than Glu-5′. Power simulations and confidence intervals support that Glu-5′ displays significantly higher differentiation than the other loci (except a single allozyme for which confidence intervals overlap). AMOVA analyses revealed significant effects of the giant kelp Macrocystis and wave exposure on this marker. We discuss the influence of hydrological conditions on the genetic differentiation among regions. In marine organisms with high fecundity and high dispersal potential, gene flow tends to erase differentiation, but this study showed significant differentiation at very small distance. This may be explained by the particular hydrology and the carved coastline of the Kerguelen archipelago, together with spatially variable selection at Glu-5′.

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A study of enzyme polymorphism in the antarctic amphipod Paramoera walkeri Stebbing

et al. 1990

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Preliminary data on the genetic differentiation of Mytilus desolationis Lamy 1936 and Aulacomya ater regia Powell 1957 (Bivalvia, mytilidae) in the Kerguelen Islands (Terres Australes et Antarctiques Fran�aises)

Cited by 9 publications

References 19 publications

Genetic relationships among populations of Mytilus desolationis from Kerguelen, M edulis from the North Atlantic and M. gallo-provincialis from the Mediterranean

Genetic relationships among populations of Mytilus desolationis from Kerguelen, M edulis from the North Atlantic and M. gallo-provincialis from the Mediterranean

Does natural selection explain the fine scale genetic structure at the nuclear exon Glu‐5′ in blue mussels from Kerguelen?

A study of enzyme polymorphism in the antarctic amphipod Paramoera walkeri Stebbing

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