Patterns of Larval Dispersal and Their Effect on the Maintenance of a Blue Mussel Hybrid Zone in Southwestern England

Gilg, Matthew R.; Hilbish, Thomas J.

doi:10.1111/j.0014-3820.2003.tb00316.x

Cited by 59 publications

(43 citation statements)

References 32 publications

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“…2001; Luttikhuizen et al. 2002; Gilg and Hilbish 2003a,b; Hilbish et al. 2003), although low frequencies of heterospecific alleles have been reported (Hamer et al.…”

Section: Discussionmentioning

confidence: 99%

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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“…2001; Luttikhuizen et al. 2002; Gilg and Hilbish 2003a,b; Hilbish et al. 2003), although low frequencies of heterospecific alleles have been reported (Hamer et al.…”

Section: Discussionmentioning

confidence: 99%

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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“…In the marine environment, there are instances of hybridization in angelfishes [79], cichlids [80], blue mussels [81] and corals [82-84], suggesting that hybridization is an important evolutionary mechanism for speciation. Nonetheless, it is often assumed that discrepancies in gene phylogenies or F ST statistics from different molecular markers is interpreted as incomplete lineage sorting, rather than reticulations as it is interpreted often in plants [41,78].…”

Section: Discussionmentioning

confidence: 99%

Phenotypic plasticity or speciation? A case from a clonal marine organism

2008

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BackgroundClonal marine organisms exhibit high levels of morphological variation. Morphological differences may be a response to environmental factors but also they can be attributed to accumulated genetic differences due to disruption of gene flow among populations. In this study, we examined the extensive morphological variation (of 14 characters) in natural populations observed in the gorgonian Eunicea flexuosa, a widely distributed Caribbean octocoral. Eco-phenotypic and genetic effects were evaluated by reciprocal transplants of colonies inhabiting opposite ends of the depth gradient and analysis of population genetics of mitochondrial and nuclear genes, respectively.ResultsSignificant differences (P < 0.001) in 14 morphological traits were found among colonies inhabiting 12 locations distributed in seven reefs in southwest Puerto Rico. Results from principal component analysis indicated the presence of two groups based on depth distribution, suggesting the presence of two discrete morphotypes (i.e. shallow type < 5 m and deep type > 17 m). A discriminant function analysis based on a priori univariate and multivariate analyses (which separated the colonies in morphotypes) correctly classified 93% of the colonies for each environment. Light, water motion and sediment transport might influence the distribution of the two morphotypes. Reaction norms of morphological characters of colonies reciprocally transplanted showed gradual significant changes through the 15 months of transplantation. Sclerites of shallow water colonies became larger when transplanted to deeper environments and vice versa, but neither of the two transplanted groups overlapped with the residents' morphology. Genetic analysis of mitochondrial and nuclear genes suggested that such discrete morphology and non-overlapping phenotypic plasticity is correlated with the presence of two independent evolutionary lineages. The distribution of the lineages is non-random and may be related to adaptational responses of each lineage to the environmental demands of each habitat.ConclusionThe extensive distribution and ample morphological variation of Eunicea flexuosa corresponds to two distinct genetic lineages with narrower distributions and more rigid phenotypic plasticity than the original description. The accepted description sensu Bayer (1961) of E. flexuosa is a complex of at least two distinct genetic lineages, adapted to different habitats and do not exchange genetic material despite living in sympatry. The present study highlights the importance of correctly defining species, because the unknowingly use of species complexes can overestimate geographical distribution, population abundance, and physiological tolerance.

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“…Performance of larvae from hybrid versus homospecific crosses is often assessed to evaluate potential selective pressures that might promote or deter hybridization (Bierne et al 2002;Matson et al 2003;Toro et al 2004). Differences in larval and juvenile environmental tolerance have also been invoked to explain habitat preferences (Riginos and Cunningham 2005) and the location of range boundaries (Gilg and Hilbish 2003;Gilg et al 2009;Hayhurst and Rawson 2009). …”

Section: Introductionmentioning

confidence: 99%

Family effects on the growth and survival of congeneric blue mussel larvae (Mytilus edulis and M. trossulus)

Yund

McCartney

2016

Mar Biol

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Patterns of Larval Dispersal and Their Effect on the Maintenance of a Blue Mussel Hybrid Zone in Southwestern England

Cited by 59 publications

References 32 publications

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

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

Phenotypic plasticity or speciation? A case from a clonal marine organism

Family effects on the growth and survival of congeneric blue mussel larvae (Mytilus edulis and M. trossulus)

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