. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Natural History Cerion VIII: A Revision • Gould and Woodruff 403. Figure 13. Geographic variation in 6-phosphogluconate dehydrogenase. Sample locality numbers may be dis- cerned from Figure 3. this locus and that the presence of the rare allele in northern Great Abaco is a bio- chemical area effect. Until more is known about the variation of this gene elsewhere in the Bahamas, we are inclined to invoke mutation and the spread of a locally ad- vantageous allele as the most likely explana- tion for this phenomenon. An a
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Natural History Cerion VIII: A Revision • Gould and Woodruff 403. Figure 13. Geographic variation in 6-phosphogluconate dehydrogenase. Sample locality numbers may be dis- cerned from Figure 3. this locus and that the presence of the rare allele in northern Great Abaco is a bio- chemical area effect. Until more is known about the variation of this gene elsewhere in the Bahamas, we are inclined to invoke mutation and the spread of a locally ad- vantageous allele as the most likely explana- tion for this phenomenon. An alternative hypothesis—that Mdh-2=' was introduced into the area with the aberrant Pongo Car- pet morphotype by hurricane transport from elsewhere—is rejected at present be- cause the allele was not detected in the three most differentiated populations of the Pongo Carpet snails. 6-Phospho gluconate dehydrogenase. While populations of C. bendalli from near Pongo Caipet (Gould et al., 1974) and Snake Cay, Great Abaco (Woodruff, 1975) are monomorphic for 6-Pgdh'\ a second codominant allele (6-Pgdh-l'') has been found elsewhere on the Little Bahama Bank (Fig. 13). This allozyme stains as a single, sharp band of slightly reduced mobility relative to e-Pgdh-l-"*; heterozygotes are 3-banded. As shown in Table 11 and Fig. 13, all samples from Grand Bahama are polymorphic with 6-Pgdh-T'' varying in fre- quency between On Little and Great Abaco, the 6-Pgdh-l'' allele has been found in two separate areas. First, at the eastern end of Little Abaco (Loc. 216), 7 heterozygotes were noted among 36 snails examined. No trace of this allele was found in the sample from Loc. 217 which was collected 100 m away on Great Abaco at the other end of the causeway connecting the two islands. Sixty kilometers further south, the e-Pgdh-L' allele was found again in samples from the area of interaction be- tween C. bendalli and C. abacoense. It was detected in 6 of 11 samples between Ro
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