Population genetics and geometric morphometrics of the freshwater snail Segmentina nitida reveal cryptic sympatric species of conservation value in Europe

Hobbs, Christopher S.; Vega, Rodrigo; Rahman, Farzana; Horsburgh, Gavin J.; Dawson, Deborah A.; Harvey, Christopher D.

doi:10.1007/s10592-021-01369-8

Cited by 5 publications

(5 citation statements)

References 83 publications

(79 reference statements)

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“…on Chichijima Island and other freshwater molluscs. Even with high‐resolution genetic analysis using microsatellites and SNPs, geographic structures on such a narrow scale are usually not detected in other regions (e.g., Hirano et al, 2019; Hobbs et al, 2021; Park et al, 2021). This result might be explained by the fact that Chichijima is topographically steep and has many catchments, whereas continents and larger islands have much larger catchments.…”

Section: Discussionmentioning

confidence: 99%

Even short‐distance dispersal over a barrier can affect genetic differentiation in Gyraulus, an island freshwater snail

Saito

Sasaki²,

Tsunamoto

et al. 2022

Freshwater Biology

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Dispersal is a fundamental mechanism for maintaining biodiversity, and long‐distance dispersal (LDD) has attracted the interest of many researchers owing to its unusual characteristics. Conventionally, LDD has been defined based on absolute and proportional distances; however, it has recently been redefined based on geographic and genetic limits. Based on this redefinition, short‐distance dispersal can have the same characteristics as LDD, depending upon the dispersal dynamics of an organism. However, the effects of LDD at a local scale on the genetic structure and diversification of organisms are poorly understood, since many studies have focused on definitive LDD, such as oversea dispersal. We focused on the freshwater snail Gyraulus sp. on an oceanic island, Chichijima Island, attempting to clarify the dynamics and effects of LDD on its genetic structure. We conducted molecular phylogenetic analyses, including divergence‐time estimation, using mitochondrial DNA and nuclear DNA markers to reveal the origin of the snail. In addition, we clarified the genetic structure, gene flow, and evolutionary history of snails on the island using mitochondrial DNA and genome‐wide single‐nucleotide polymorphisms. Finally, we followed a landscape ecology approach to identify barriers to dispersal. Our phylogenies suggested that the snail has a single origin. Based on our divergence–time estimation, colonisation was estimated to have occurred around the late Pliocene to early Pleistocene. Our population genetic analyses documented genetic differentiation even within this small oceanic island. Based on the divergence time estimation and approximate Bayesian computation using single‐nucleotide polymorphisms, the differentiation was estimated to have begun around the late Pleistocene. Little gene flow occurred between the geographically structured snail genetic groups. Landscape analysis suggested that catchment boundaries were a major barrier to dispersal. Considering the geography of the island, these results suggested that low‐frequency dispersal over barriers is an important factor in genetic differentiation within the island. Furthermore, dispersal over barrier may be considered LDD, even though the dispersal distance is only several kilometres. Genetic evidence also suggested that resistance to gene flow over the barrier, rather than distance, is more important in determining whether dispersal should be considered LDD. This suggests that a definition of LDD that depends only on the distance may mislead an understanding of dispersal mode.

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Section: Discussionmentioning

confidence: 99%

Even short‐distance dispersal over a barrier can affect genetic differentiation in Gyraulus, an island freshwater snail

Saito

Sasaki²,

Tsunamoto

et al. 2022

Freshwater Biology

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“…Since this study was carried out a study (Hobbs et al, 2021) investigating the population structure of S. nitida individuals from Poland, Germany, Sweden and the UK to identify differences both within and between populations has been published. The study found that there are two distinct genetic lineages (also distinct in shape), one in western Europe (UK, Germany -Lineage 1) and one in eastern Europe (Poland, Sweden -Lineage 2).…”

Section: Discussionmentioning

confidence: 99%

A qPCR assay for the rapid and specific detection of Shining ram’s-horn snail (Segmentina nitida) eDNA from Stodmarsh National Nature Reserve, UK

Rees

Cousins

Baker

et al. 2022

Preprint

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Segmentina nitida Müller 1774 is a freshwater snail which was formerly widespread throughout England and south Wales. Since the 1840s it has seen a rapid decline in its range which has been attributed to deteriorating water quality due to nutrient enrichment, lowering of water tables and over-management of the ditches in which it resides. Segmentina nitida has therefore been identified as a UK Biodiversity Action Plan (UKBAP) priority species which recommends further research for its conservation. Here we have developed a Taqman based qPCR eDNA assay for the detection of S. nitida at the Stodmarsh National Nature Reserve and compared the results with a manual survey of the ditches at this location. Our eDNA analysis exhibited an observed percentage agreement of 84% with a kappa coefficient of agreement between manual and eDNA surveys of 0.56. Three ditches determined to be negative for Segmentina nitida by eDNA analysis were manual survey positive, and a further two ditches that were negative by manual survey were positive by eDNA analysis revealing the potential for improved overall detection rates using a combination of manual and eDNA methodologies. eDNA analysis could therefore augment manual survey techniques for Segmentina nitida as a relatively quick and inexpensive tool for collecting presence and distribution data that could be used to inform manual surveys and management of ditches.

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“…Since this study was carried out a study [13] investigating the population structure of S. nitida individuals from Poland, Germany, Sweden and the UK to identify differences both within and between populations has been published. The study found that there are two distinct genetic lineages (also distinct in shape), one in western Europe (UK, Germany-Lineage 1) and one in eastern Europe (Poland, Sweden-Lineage 2).…”

Section: Plos Onementioning

confidence: 99%

“…Although once common in the UK, and widespread across lowland England and south Wales, the range of this species has substantially declined since the 1840s [12]. The decline of this species has been attributed to over-dredging of drainage ditches for land management; the conversion of grazing marshes to arable farmland; and eutrophication [13].…”

Section: Introductionmentioning

confidence: 99%

A qPCR assay for the rapid and specific detection of Shining ram’s-horn snail (Segmentina nitida) eDNA from Stodmarsh National Nature Reserve, UK

Rees,

Cousins,

Baker

et al. 2023

PLoS ONE

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Segmentina nitida Müller 1774 is a freshwater snail which was formerly widespread throughout England and south Wales. Since the 1840s it has seen a rapid decline in its range which has been attributed to deteriorating water quality due to nutrient enrichment, lowering of water tables and over-management of the ditches in which it resides. S. nitida has therefore been identified as a UK Biodiversity Action Plan (UKBAP) priority species which recommends further research for its conservation. Here we have developed a Taqman based qPCR eDNA assay for the detection of S. nitida at the Stodmarsh National Nature Reserve and compared the results with a manual survey of the ditches at this location. 32 ditches were surveyed in November 2020 (22 at Stodmarsh) and February 2021 (10 outside the known range of S.nitida). Our eDNA analysis exhibited an observed percentage agreement of 84% with a kappa coefficient of agreement between manual and eDNA surveys of 0.56 (95% CI 0.22 to 0.92). Three ditches determined to be negative for S. nitida by eDNA analysis were manual survey positive, and a further two ditches that were negative by manual survey were positive by eDNA analysis revealing the potential for improved overall detection rates using a combination of manual and eDNA methodologies. eDNA analysis could therefore augment manual survey techniques for S. nitida as a relatively quick and inexpensive tool for collecting presence and distribution data that could be used to inform manual surveys and management of ditches.

show abstract

Population genetics and geometric morphometrics of the freshwater snail Segmentina nitida reveal cryptic sympatric species of conservation value in Europe

Cited by 5 publications

References 83 publications

Even short‐distance dispersal over a barrier can affect genetic differentiation in Gyraulus, an island freshwater snail

Even short‐distance dispersal over a barrier can affect genetic differentiation in Gyraulus, an island freshwater snail

A qPCR assay for the rapid and specific detection of Shining ram’s-horn snail (Segmentina nitida) eDNA from Stodmarsh National Nature Reserve, UK

A qPCR assay for the rapid and specific detection of Shining ram’s-horn snail (Segmentina nitida) eDNA from Stodmarsh National Nature Reserve, UK

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