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Genetic Divergence Between South African Helcion Species and North-East Atlantic H. Pellucidum (Mollusca: Patellogastropoda)

Genetic Divergence Between South African Helcion Species and North-East Atlantic H. Pellucidum (Mollusca: Patellogastropoda)
Genetic Divergence Between South African Helcion Species and North-East Atlantic H. Pellucidum (Mollusca: Patellogastropoda)
Allozyme electrophoresis was used to estimate the genetic divergence between three species of South African Helcion and the north-east Atlantic H. pellucidum (Patellidae). At a finer level the genetic relationships among South African Helcion were explored. Twenty-one loci were resolved for all the species. High values of expected heterozygosities (0·202–0·341) were found for the genus. Phenetic analysis (UPGMA (unweighted pair-group method with artihmetic averaging) and Distance Wagner Procedure) and cladistic parsimony methods (alleles as binary characters and loci as multistate unordered characters) agreed in showing the same topology for the tree which represents the genetic relationships among Helcion species. The north-east Atlantic H. pellucidum was the most divergent species showing high values of Nei's genetic distances (1·423–1·654) with its South African congeners. In the literature such values of genetic divergence have been associated with non-congeneric species. The degree of genetic divergence (0·351–0·615) found within the South African branch was characteristic for congeneric species. The results of this study supported the monophyletic condition of this branch, and showed H. pectunculus and H. pruinosus to be more closely related to each other than to H. dunkeri. Nevertheless, the monophyly of the genus Helcion is uncertain and therefore its taxonomic status was questioned. A possible independent origin for northern and southern hemisphere species of Helcion is considered.
0025-3154
1139-1159
Weber, L.I.
4069a778-5a62-4dac-8bb6-6fe5ed30d69d
Gray, D.R.
9fa62155-eb9d-4537-90de-6c7717f17572
Hodgson, A.N.
d608eaa4-63ec-460b-ab95-48a6b058bc8d
Hawkins, S.J.
758fe1c1-30cd-4ed1-bb65-2471dc7c11fa
Weber, L.I.
4069a778-5a62-4dac-8bb6-6fe5ed30d69d
Gray, D.R.
9fa62155-eb9d-4537-90de-6c7717f17572
Hodgson, A.N.
d608eaa4-63ec-460b-ab95-48a6b058bc8d
Hawkins, S.J.
758fe1c1-30cd-4ed1-bb65-2471dc7c11fa

Weber, L.I., Gray, D.R., Hodgson, A.N. and Hawkins, S.J. (1997) Genetic Divergence Between South African Helcion Species and North-East Atlantic H. Pellucidum (Mollusca: Patellogastropoda). Journal of the Marine Biological Association of the United Kingdom, 77 (4), 1139-1159. (doi:10.1017/S0025315400038674).

Record type: Article

Abstract

Allozyme electrophoresis was used to estimate the genetic divergence between three species of South African Helcion and the north-east Atlantic H. pellucidum (Patellidae). At a finer level the genetic relationships among South African Helcion were explored. Twenty-one loci were resolved for all the species. High values of expected heterozygosities (0·202–0·341) were found for the genus. Phenetic analysis (UPGMA (unweighted pair-group method with artihmetic averaging) and Distance Wagner Procedure) and cladistic parsimony methods (alleles as binary characters and loci as multistate unordered characters) agreed in showing the same topology for the tree which represents the genetic relationships among Helcion species. The north-east Atlantic H. pellucidum was the most divergent species showing high values of Nei's genetic distances (1·423–1·654) with its South African congeners. In the literature such values of genetic divergence have been associated with non-congeneric species. The degree of genetic divergence (0·351–0·615) found within the South African branch was characteristic for congeneric species. The results of this study supported the monophyletic condition of this branch, and showed H. pectunculus and H. pruinosus to be more closely related to each other than to H. dunkeri. Nevertheless, the monophyly of the genus Helcion is uncertain and therefore its taxonomic status was questioned. A possible independent origin for northern and southern hemisphere species of Helcion is considered.

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Published date: 1997

Identifiers

Local EPrints ID: 188739
URI: http://eprints.soton.ac.uk/id/eprint/188739
ISSN: 0025-3154
PURE UUID: 3499b522-3525-4951-bb0b-aa888afbdfe9

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Date deposited: 27 May 2011 09:13
Last modified: 14 Mar 2024 03:32

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Contributors

Author: L.I. Weber
Author: D.R. Gray
Author: A.N. Hodgson
Author: S.J. Hawkins

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