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Genetics and shell morphometrics of assimineids (Mollusca, Caenogastropoda, Truncatelloidea) in the St Lucia Estuary, South Africa.

Miranda NA, van Rooyen R, MacDonald A, Ponder W, Perissinotto R - Zookeys (2014)

Bottom Line: The Assimineidae are a family of amphibious microgastropods that can be mostly found in estuaries and mangroves in South Africa.These two taxa exhibit patterns of spatial overlap that appear to vary depending on environmental parameters, particularly salinity.The need to resolve the complex taxonomy of assimineids is highlighted.

View Article: PubMed Central - HTML - PubMed

Affiliation: DST/NRF Research Chair in Shallow Water Ecosystems, c/o Department of Zoology, Nelson Mandela Metropolitan University, P O Box 77000, Port Elizabeth, 6031, South Africa.

ABSTRACT
The Assimineidae are a family of amphibious microgastropods that can be mostly found in estuaries and mangroves in South Africa. These snails often occur in great numbers and are ecologically important to the St Lucia Estuary, which forms a crucial part of the iSimangaliso Wetland Park, a UNESCO World Heritage Site. Genetic and shell morphometric analyses were conducted on individuals collected from nine localities distributed from the northern lake regions to the southern lake and the mouth of the St Lucia estuarine lake. Mitochondrial (COI) and nuclear (28S) DNA was used to construct Bayesian Inference, Neighbour-joining, Maximum Parsimony and Maximum Likelihood trees. Principal Component Analysis and Cluster Analysis were performed on standard shell parameter data. Results indicate that two different taxa are present in St Lucia. The taxon comprising individuals from the South Lake and St Lucia Estuary Mouth is identified as Assiminea cf. capensis Bartsch, in accordance with the latest taxonomic consensus. The taxon comprising assimineid individuals from False Bay, North Lake and South Lake, is here tentatively named "Assiminea" aff. capensis (Sowerby). These two taxa exhibit patterns of spatial overlap that appear to vary depending on environmental parameters, particularly salinity. The need to resolve the complex taxonomy of assimineids is highlighted.

No MeSH data available.


Related in: MedlinePlus

Bayesian Inference tree for COI data. Support values are as follows: Bayesian Inference/NJ/ML/MP.
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Figure 2: Bayesian Inference tree for COI data. Support values are as follows: Bayesian Inference/NJ/ML/MP.

Mentions: All phylogenetic analyses strongly supported the separation of the False Bay (Lister’s Point, i.e. “Assiminea” aff. capensis (Sowerby)) and South Lake (Charter’s Creek and Catalina Bay, i.e. Assiminea cf. capensis Bartsch) samples into distinct clades, with supporting bootstrap values of 100% NJ and MP, 98% for ML and 1.0 for Bayesian inference (Fig. 2). All trees showed weak to moderate support for sub clades including Haplotype 2 and 3. All trees showed weak to moderate support for a Haplotype 6, 8 and 9 sub clade and Bayesian inference and MP trees for a Haplotype III and VI sub clade. The average variance between the two regions was 86.23 base pairs, which equates to a 17.04% genetic variance (Table 2).


Genetics and shell morphometrics of assimineids (Mollusca, Caenogastropoda, Truncatelloidea) in the St Lucia Estuary, South Africa.

Miranda NA, van Rooyen R, MacDonald A, Ponder W, Perissinotto R - Zookeys (2014)

Bayesian Inference tree for COI data. Support values are as follows: Bayesian Inference/NJ/ML/MP.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4109452&req=5

Figure 2: Bayesian Inference tree for COI data. Support values are as follows: Bayesian Inference/NJ/ML/MP.
Mentions: All phylogenetic analyses strongly supported the separation of the False Bay (Lister’s Point, i.e. “Assiminea” aff. capensis (Sowerby)) and South Lake (Charter’s Creek and Catalina Bay, i.e. Assiminea cf. capensis Bartsch) samples into distinct clades, with supporting bootstrap values of 100% NJ and MP, 98% for ML and 1.0 for Bayesian inference (Fig. 2). All trees showed weak to moderate support for sub clades including Haplotype 2 and 3. All trees showed weak to moderate support for a Haplotype 6, 8 and 9 sub clade and Bayesian inference and MP trees for a Haplotype III and VI sub clade. The average variance between the two regions was 86.23 base pairs, which equates to a 17.04% genetic variance (Table 2).

Bottom Line: The Assimineidae are a family of amphibious microgastropods that can be mostly found in estuaries and mangroves in South Africa.These two taxa exhibit patterns of spatial overlap that appear to vary depending on environmental parameters, particularly salinity.The need to resolve the complex taxonomy of assimineids is highlighted.

View Article: PubMed Central - HTML - PubMed

Affiliation: DST/NRF Research Chair in Shallow Water Ecosystems, c/o Department of Zoology, Nelson Mandela Metropolitan University, P O Box 77000, Port Elizabeth, 6031, South Africa.

ABSTRACT
The Assimineidae are a family of amphibious microgastropods that can be mostly found in estuaries and mangroves in South Africa. These snails often occur in great numbers and are ecologically important to the St Lucia Estuary, which forms a crucial part of the iSimangaliso Wetland Park, a UNESCO World Heritage Site. Genetic and shell morphometric analyses were conducted on individuals collected from nine localities distributed from the northern lake regions to the southern lake and the mouth of the St Lucia estuarine lake. Mitochondrial (COI) and nuclear (28S) DNA was used to construct Bayesian Inference, Neighbour-joining, Maximum Parsimony and Maximum Likelihood trees. Principal Component Analysis and Cluster Analysis were performed on standard shell parameter data. Results indicate that two different taxa are present in St Lucia. The taxon comprising individuals from the South Lake and St Lucia Estuary Mouth is identified as Assiminea cf. capensis Bartsch, in accordance with the latest taxonomic consensus. The taxon comprising assimineid individuals from False Bay, North Lake and South Lake, is here tentatively named "Assiminea" aff. capensis (Sowerby). These two taxa exhibit patterns of spatial overlap that appear to vary depending on environmental parameters, particularly salinity. The need to resolve the complex taxonomy of assimineids is highlighted.

No MeSH data available.


Related in: MedlinePlus