Camaenid land snails on Barrow Island: distributions, molecular phylogenetics and taxonomic revision

Johnson, M. S.; Stankowski, Sean; Whisson, Corey; Teale, Roy J.; Hamilton, Zoë R.

doi:10.18195/issn.0313-122x.83.2013.159-171

Cited by 7 publications

(4 citation statements)

References 14 publications

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Section: North Americamentioning

confidence: 74%

“…Alternatively, the significant structuring across the United States may indicate the presence of cryptic species, as the COI genetic distances among these populations are relatively high. These genetic distances are higher than the standard 5% divergence in mtDNA between mollusk species, as seen in studies of Rhagada [ 78 ], Eobania [ 79 ], Iberus [ 80 ], Helixena [ 81 ], and Goniobasis species [ 82 ]. Other studies assessing the biogeographic patterns of freshwater snails have used mtDNA genetic distances of 1.3% in Pyrgulopsis [ 74 ] and 5% in Physella [ 9 ] to distinguish between species.…”

Section: Discussionmentioning

confidence: 89%

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Biogeography of the freshwater gastropod, Planorbella trivolvis, in the western United States

Mack

Johnson

Bowerman³

et al. 2020

PLoS ONE

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Despite the important roles of freshwater gastropods in aquatic ecosystems, the taxonomic status of many taxa is unclear, which is compounded by a lack of information on species population genetic structuring, distribution, and dispersal patterns. The objective of this study was to address the biogeography of the freshwater snail Planorbella trivolvis (Gastropoda: Planorbidae) in the western United States. We amplified two genetic markers (16S, COI) from individuals belonging to western USA populations and downloaded genetic data from GenBank. We utilized minimum spanning networks to assess the genetic patterns and performed Analysis of Molecular Variance and linear regression analyses to determine how geographic distance and watershed identity contributed to the observed genetic structuring. For both markers, we found that the majority of genetic variation was associated within and among populations, rather than among watersheds. Correspondingly, there was no significant effect of geographic distance on genetic distance, suggesting that long-distance dispersal was promoting gene flow between populations. The genetic similarity could reflect avian-mediated dispersal of snails along the Pacific Flyway, a major waterfowl migratory corridor. Further analysis of the population structuring across North America revealed East-West genetic structuring, suggesting that across longitudinal gradients P. trivolvis experiences significant genetic isolation.

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Section: North Americamentioning

confidence: 74%

Section: Discussionmentioning

confidence: 89%

Biogeography of the freshwater gastropod, Planorbella trivolvis, in the western United States

Mack

Johnson

Bowerman³

et al. 2020

PLoS ONE

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“…Of the 31 described Western Australian species of Rhagada [8-10] , which occupy approximately 200,000 km 2 , seven are found in the 250 km 2 Dampier Archipelago. Six of those species and a further three undescribed forms are endemic to the islands [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Despite its small area and continental origin, the Dampier Archipelago in Western Australia has supported local evolution, where land snails from the genus Rhagada have undergone extensive morphological diversification [ 6 , 7 ]. Of the 31 described Western Australian species of Rhagada [ 8 - 10 ] , which occupy approximately 200,000 km 2 , seven are found in the 250 km 2 Dampier Archipelago. Six of those species and a further three undescribed forms are endemic to the islands [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Biogeographic discordance of molecular phylogenetic and phenotypic variation in a continental archipelago radiation of land snails

Stankowski

Johnson

2014

BMC Evol Biol

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BackgroundIn island archipelagos, where islands have experienced repeated periods of fragmentation and connection through cyclic changes in sea level, complex among-island distributions might reflect historical distributional changes or local evolution. We test the relative importance of these mechanisms in an endemic radiation of Rhagada land snails in the Dampier Archipelago, a continental archipelago off the coast of Western Australia, where ten morphospecies have complex, overlapping distributions.ResultsWe obtained partial mtDNA sequence (COI) for 1015 snails collected from 213 locations across 30 Islands, and used Bayesian phylogenetic analysis and Analysis of Molecular Variance (AMOVA) to determine whether geography or the morphological taxonomy best explains the pattern of molecular evolution. Rather than forming distinct monophyletic groups, as would be expected if they had single, independent origins, all of the widely distributed morphospecies were polyphyletic, distributed among several well-supported clades, each of which included several morphospecies. Each mitochondrial clade had a clear, cohesive geographic distribution, together forming a series of parapatric replacements separated by narrow contact zones. AMOVA revealed further incongruence between mtDNA diversity and morphological variation within clades, as the taxonomic hypothesis always explained a low or non-significant proportion of the molecular variation. In contrast, the pattern of mtDNA evolution closely reflected contemporary and historical marine barriers.ConclusionsDespite opportunities for distributional changes during periods when the islands were connected, there is no evidence that dispersal has contributed to the geographic variation of shell form at the broad scale. Based on an estimate of dispersal made previously for Rhagada, we conclude that the periods of connection have been too short in duration to allow for extensive overland dispersal or deep mitochondrial introgression. The result is a sharp and resilient phylogeographic pattern. The distribution of morphotypes among clades and distant islands is explained most simply by their parallel evolution.

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Unravelling the riddle of Radix: DNA barcoding for species identification of freshwater snail intermediate hosts of zoonotic digeneans and estimating their inter-population evolutionary relationships

Lawton

Lim

Dukes

et al. 2015

Infection, Genetics and Evolution

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Please cite this article as: Lawton, S.P., Lim, R.M., Dukes, J.P., Kett, S.M., Cook, R.T., Walker, A.J., Kirk, R.S., Unravelling the riddle of Radix: DNA barcoding for species identification of freshwater snail intermediate hosts of zoonotic digeneans and estimating their inter-population evolutionary relationships, Infection, Genetics and Evolution (2015), doi: http://dx.doi.org/10. 1016/j.meegid.2015.07.021 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. and ITS2 sequences, identified populations of Radix auricularia and R. balthica from specimens originally morphologically identified as R. peregra from the UK. Assessment of cox1 and ITS2 as species identification markers showed that, although both markers differentiated species, cox1 possessed greater molecular diversity and higher phylogenetic resolution. Cox1 also proved useful for gaining insights into the evolutionary relationships of Radix species populations. Phylogenetic analysis and haplotype networks of cox1 indicated that Radix auricularia appeared to have invaded the UK several times; some haplotypes forming a distinct UK specific clade, whilst others are more akin to those found on mainlandEurope. This was in contrast to relationships between R. balthica populations, which had low molecular diversity and no distinct UK specific haplotypes, suggesting recent and multiple invasions from mainland Europe. Molecular techniques therefore appear to be crucial for distinguishing Radix spp., particularly using cox1. This barcoding marker also enables the population biology of Radix spp. to be explored, and is invaluable for monitoring the epidemiology of fluke diseases especially in the light of emerging diseases and food security.

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Camaenid land snails on Barrow Island: distributions, molecular phylogenetics and taxonomic revision

Cited by 7 publications

References 14 publications

Biogeography of the freshwater gastropod, Planorbella trivolvis, in the western United States

Biogeography of the freshwater gastropod, Planorbella trivolvis, in the western United States

Biogeographic discordance of molecular phylogenetic and phenotypic variation in a continental archipelago radiation of land snails

Unravelling the riddle of Radix: DNA barcoding for species identification of freshwater snail intermediate hosts of zoonotic digeneans and estimating their inter-population evolutionary relationships

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