Patterns of Genetic Differentiation and Conservation of the Slabside Pearlymussel, Lexingtonia Dolabelloides (Lea, 1840) in the Tennessee River Drainage

Grobler, Paul; Jones, Jess W.; Johnson, Nathan A.; Beaty, Braven; Struthers, Jennifer; Neves, Richard J.; Hallerman, Eric M.

doi:10.1093/mollus/eyi055

Cited by 34 publications

(23 citation statements)

References 22 publications

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“…Individuals from the most northern and southern portions of the distribution (i.e., Minnesota to Guatemala) differed by a less than 1% average COI p-distance and had identical ITS1 haplotypes ( Table 2). The COI sequence divergence within Megalonaias is lower than the intraspecific diversity of many other more geographically restricted amblemine species (Roe & Lydeard, 1998;Grobler et al, 2006;Burdick & White, 2007;Elderkin et al, 2007;Inoue et al, 2013). Despite having relatively low genetic divergence in comparison to many other amblemines, there is significant genetic structure associated with the five a priori geographic regions (AMOVA P \ 0.001).…”

Section: Megalonaias Species-level Diversitymentioning

confidence: 96%

Molecular phylogeny of the Nearctic and Mesoamerican freshwater mussel genus Megalonaias

et al. 2017

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Megalonaias is the most geographically widespread genus of the subfamily Ambleminae and is distributed across much of the eastern half of North America, from Minnesota to Nicaragua. Despite the large geographic distribution, the species-level diversity of Megalonaias is quite depauperate (2 spp.), suggesting the genus may not be constrained by the same physical, ecological, or physiological barriers that limit dispersal in many other amblemines. However, this hypothesis is contingent on the assumption that the current taxonomy of Megalonaias accurately reflects its evolutionary history, which remains incompletely understood due to the marginalization of Mesoamerican populations in systematic research. Using one mitochondrial (COI) and one nuclear marker (ITS1) sequenced from 41 individuals distributed across both the Nearctic and Mesoamerican ecoregions, we set out to better understand the species boundaries and genetic diversity within Megalonaias. The reconstructed molecular phylogeny and the observed genetic diversity suggests that Megalonaias is a monotypic genus and that Megalonaias nickliniana, currently considered a federally endangered species, is not a valid species. These results are discussed in the context of their systematic and conservation implications, as well as how the unusual life history strategy of Megalonaias may be influencing its molecular diversity.

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Section: Megalonaias Species-level Diversitymentioning

confidence: 96%

Molecular phylogeny of the Nearctic and Mesoamerican freshwater mussel genus Megalonaias

et al. 2017

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“…This effect appears to significantly influence the overall population structuring of pearl mussels and has also been described to increase the distinctiveness of some North American mussel populations (e.g. Grobler et al 2006). …”

Section: Genetic Diversitymentioning

confidence: 87%

Drainage-independent genetic structure and high genetic diversity of endangered freshwater pearl mussels (Margaritifera margaritifera) in northern Europe

et al. 2009

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Freshwater pearl mussels (Margaritifera margaritifera) are among the most critically threatened bivalve molluscs worldwide. An understanding of spatial patterns of genetic diversity is crucial for the development of integrative conservation strategies. We used microsatellites to study the genetic diversity and differentiation of 14 populations of M. margaritifera in central Sweden, an area which was described as a major secondary contact zone in postglacial colonisation for other species. Genetic diversity of Swedish pearl mussel populations was much greater than in central and southern Europe but similar to the genetic diversity observed in the northeastern portion of their European range. Genetic differentiation among populations was pronounced but to a large extent independent from present-day drainage systems. The complex patterns of genetic diversity and differentiation in pearl mussel seem to be strongly influenced by the species' high degree of specialisation and extraordinary life history strategy which involves facultative hermaphrodism and an obligatory encystment stage on a host fish. Genetic drift effects and anthropogenic disturbances resulting in reduction of population size and loss of connectivity are less pronounced in northern pearl mussel populations compared to those in central and southern Europe.

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“…A pattern of genetic isolation-by-distance has been observed in other species of freshwater mussel, for example, the North American species Quadrula quadrula Rafinesque (Berg et al 1998), but is by no means universal. Thus, other studies have failed to find evidence of isolation by distance across similar or even greater geographic distances in, for example, Lexingtonia dolabelloides (Lea) (Grobler et al 2006), M. margaritifera (Machordom et al 2003;Bouza et al 2007) and Amblema plicata (Say) (Elderkin et al 2007). Reasons for such differences between species and/or water bodies are likely to be complicated and, besides differences in the vagility of their fish hosts, probably include confounding patterns of pre-and postglacial colonisation that may ''overshadow'' recent dispersal events and anthropogenic influences relating to fish stocking measures.…”

Section: Genetic Population Structurementioning

confidence: 99%

Phenotypic plasticity and genetic isolation-by-distance in the freshwater mussel Unio pictorum (Mollusca: Unionoida)

et al. 2010

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Freshwater mussels (Unionoida) show high intraspecific morphological variability, and some shell morphological traits are believed to be associated with habitat conditions. It is not known whether and which of these ecophenotypic differences reflect underlying genetic differentiation or are the result of phenotypic plasticity. Using 103 amplified fragment length polymorphism (AFLP) markers, we studied population genetics of three paired Unio pictorum populations sampled from two different habitat types (marina and river) along the River Thames. We found genetic differences along the Thames which were consistent with a pattern of isolation by distance and probably reflect limited dispersal via host fish species upon which unionoid larvae are obligate parasites. No consistent genetic differences were found between the two different habitat types suggesting that morphological differences in the degree of shell elongation and the shape of dorso-posterior margin are caused by phenotypic plasticity. Our study provides the first good evidence for phenotypic plasticity of shell shape in a European unionoid and illustrates the need to include genetic data in order properly to interpret geographic patterns of morphological variation.

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Patterns of Genetic Differentiation and Conservation of the Slabside Pearlymussel, Lexingtonia Dolabelloides (Lea, 1840) in the Tennessee River Drainage

Cited by 34 publications

References 22 publications

Molecular phylogeny of the Nearctic and Mesoamerican freshwater mussel genus Megalonaias

Molecular phylogeny of the Nearctic and Mesoamerican freshwater mussel genus Megalonaias

Drainage-independent genetic structure and high genetic diversity of endangered freshwater pearl mussels (Margaritifera margaritifera) in northern Europe

Phenotypic plasticity and genetic isolation-by-distance in the freshwater mussel Unio pictorum (Mollusca: Unionoida)

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