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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 28S data. Support values are as follows: Bayesian Inference/ML/MP/NJ.
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Figure 3: Bayesian Inference tree for 28S data. Support values are as follows: Bayesian Inference/ML/MP/NJ.

Mentions: The 28S data set yielded 18 haplotypes (Table 2) with 30 variable sites, 18 of which were parsimony informative. The average G+C content was 63.3%. Haplotype 7 was the most common (27 individuals) and was represented by all individuals from all populations, except the large Charter’s Creek, large Catalina Bay and Back Channel individuals. Phylogenetic analyses showed varying support for the separation of two clades (Fig. 3). The first clade was made up entirely of all the individuals from the large Charter’s Creek, large Catalina Bay and Back Channel individuals (i.e. Assiminea cf. capensis Bartsch). This clade was strongly supported by all phylogenetic analyses with the exception of ML. The MP and NJ trees showed strong support for the separation of a second clade. This clade was made up entirely of all samples from the other four populations (i.e. “Assiminea” aff. capensis (Sowerby)). All trees differed only slightly in the position of the branches within the clades.


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 28S data. Support values are as follows: Bayesian Inference/ML/MP/NJ.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

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

Figure 3: Bayesian Inference tree for 28S data. Support values are as follows: Bayesian Inference/ML/MP/NJ.
Mentions: The 28S data set yielded 18 haplotypes (Table 2) with 30 variable sites, 18 of which were parsimony informative. The average G+C content was 63.3%. Haplotype 7 was the most common (27 individuals) and was represented by all individuals from all populations, except the large Charter’s Creek, large Catalina Bay and Back Channel individuals. Phylogenetic analyses showed varying support for the separation of two clades (Fig. 3). The first clade was made up entirely of all the individuals from the large Charter’s Creek, large Catalina Bay and Back Channel individuals (i.e. Assiminea cf. capensis Bartsch). This clade was strongly supported by all phylogenetic analyses with the exception of ML. The MP and NJ trees showed strong support for the separation of a second clade. This clade was made up entirely of all samples from the other four populations (i.e. “Assiminea” aff. capensis (Sowerby)). All trees differed only slightly in the position of the branches within the clades.

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