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Allozyme Evidence for Cryptic Speciation in Sympatric Populations of Nassarius spp. (Mollusca: Gastropoda)

Published online by Cambridge University Press:  11 May 2009

Andrés Sanjuan ,
Marcos Losada-Perez  and
Emilio Rolan
Andrés Sanjuan
Affiliation:
Xenética Evolutiva Molecular, Facultade de Ciencias-Bioloxia, Universidade de Vigo, E-36200 Vigo, Spain.
Marcos Losada-Perez
Affiliation:
Xenética Evolutiva Molecular, Facultade de Ciencias-Bioloxia, Universidade de Vigo, E-36200 Vigo, Spain.
Emilio Rolan
Affiliation:
Cánovas del Castillo, 22, E-36202 Vigo, Spain
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Extract

The Nassarius reticulatus complex (Mollusca: Gastropoda) is a common and morphologically variable organism of the Lusitanian marine province. The taxonomic status of the different morphs has been the subject of considerable debate for over a century. About 50 individuals of each N. nitidus and N. reticulatus morphs were collected in November 1994 from the same area (Ria de Vigo, north-west Iberian Peninsula). Preliminary screening by allozyme electrophoresis for 27 enzymes resolved 24 presumptive enzyme loci. There were no deviations from the Hardy-Weinberg expected proportions at most polymporphic loci for any morph. Five and two enzyme loci were completely and partially diagnostic loci, respectively, between the morphs. The genetic identity of morphs (1=0.658 ±0.095) was characteristic of congeneric species. The absence of electrophoretically recognizable hybrids in sympatric populations provides clear evidence that the two morphs are reproductively isolated within the study area. These genetic results corroborate other reported biochemical, morphological and behavioural differences between the morphs. Consequently, these data strongly suggest that the taxa N. nitidus and N. reticulatus must be considered as separate species.

Information

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 77 , Issue 3 , August 1997 , pp. 773 - 784
Copyright
Copyright © Marine Biological Association of the United Kingdom 1997

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