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1 February 2007 Allozyme Variation in the Camaenid Tree Snails Amphidromus atricallosus (Gould, 1843) and A. inversus (Müller, 1774)
Pongpun Prasankok, Hidetoshi Ota, Mamoru Toda, Somsak Panha
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We examined allozyme variation in two camaenid tree snails, Amphidromus atricallosus and A. inversus, across two principal regions of Thailand and from Singapore, plus for A. inversus, one site in peninsular Malaysia. Using horizontal starch gel electrophoresis, 13 allozyme loci (11 polymorphic) were screened for A. atricallosus and 18 (5 polymorphic) for A. inversus. Heterozygosity was higher in A. atricallosus (Hexp=0.018–0.201, mean=0.085) than in A. inversus (Hexp=0–0.023, mean= 0.002). Genetic heterogeneity among samples was higher in A. inversus (Fst=0.965) than in A. atricallosus (Fst=0.781). Within A. atricallosus, populations were more differentiated in southern Thailand (Fst=0.551) than in eastern Thailand (Fst=0.144). The high Fst and low Hexp in populations of A. inversus suggest that this species is likely to have experienced a series of strong bottlenecks, perhaps occurring chiefly on offshore continental-shelf islands. The low Fst values of A. atricallosus in eastern Thailand suggest frequent gene flows among populations in this region. The southern and eastern samples of A. atricallosus exhibited fixed allele differences at four loci and great genetic distance (Nei's D=0.485–0.946), suggesting that these two samples may actually represent, or else be evolving into, separate species.

Pongpun Prasankok, Hidetoshi Ota, Mamoru Toda, and Somsak Panha "Allozyme Variation in the Camaenid Tree Snails Amphidromus atricallosus (Gould, 1843) and A. inversus (Müller, 1774)," Zoological Science 24(2), 189-197, (1 February 2007).
Received: 17 June 2006; Accepted: 1 October 2006; Published: 1 February 2007
Amphidromus atricallosus
Amphidromus inversus
geographic genetic structure
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