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Journal Molluscan Studies Advance Access originally published online on July 11, 2007
Journal of Molluscan Studies 2007 73(3):223-228; doi:10.1093/mollus/eym012
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© The Author 2007. Published by Oxford University Press on behalf of The Malacological Society of London, all rights reserved

Lack of genetic differentiation among four sympatric southeast African intertidal limpets (Siphonariidae): phenotypic plasticity in a single species?

Peter R. Teske1,2,, Nigel P. Barker2 and Christopher D. McQuaid1

1Department of Zoology and Entomology, Rhodes University, 6140 Grahamstown, South Africa; and 2Molecular Ecology and Systematics Group, Botany Department, Rhodes University, 6140 Grahamstown, South Africa

Correspondence: P.R. Teske; e-mail: p.teske{at}ru.ac.za


  Abstract

Specimens of four sympatric intertidal limpet species (Siphonaria dayi, S. tenuicostulata, S. anneae and S. nigerrima) were collected from four localities on the east coast of South Africa and southern Mozambique. Their phylogenetic relationships were investigated using sequences of the mitochondrial COI gene and the intron-containing nuclear ATPSß gene. Two closely related lineages were recovered, which grouped specimens on the basis of geography rather than morphology. One lineage was associated with the subtropical coastline of South Africa's east coast and the other with the tropical coastline of northeastern South Africa and southern Mozambique. This genetic discontinuity coincides with a biogeographic boundary located in the vicinity of Cape St Lucia. Combined genetic diversity of the four species was lower than that of three other southern African congeners, and fell within the range determined for single southern African marine mollusc species. We suggest that the four limpet species are in fact different morphotypes of a single species.

(Received 6 October 2006; accepted 29 March 2007)


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