. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 406 Bulletin Museum of Comparative Zoology, Vol. 148, No. 8. Figure 16. Geographic variation in esterase-2. Sample locality numbers may be discerned from Figure 3. Snake Cay, Great Abaco. At that time, the codominant alleles were designated Est-2'' and Est-2''. Now, as a result of this far more extensive survey, we report that at least 7 alleles occur at this locus among the Cerion of the Little Bahama Bank. The various alleles are all codominant and are desig- nated Est-^', Est-2'' . . Est-2'^' in order of decreasing
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 406 Bulletin Museum of Comparative Zoology, Vol. 148, No. 8. Figure 16. Geographic variation in esterase-2. Sample locality numbers may be discerned from Figure 3. Snake Cay, Great Abaco. At that time, the codominant alleles were designated Est-2'' and Est-2''. Now, as a result of this far more extensive survey, we report that at least 7 alleles occur at this locus among the Cerion of the Little Bahama Bank. The various alleles are all codominant and are desig- nated Est-^', Est-2'' . . Est-2'^' in order of decreasing mobility. The alleles reported by Woodruff (1975) are now redesignated Est-2'' and Est-2^ respectively. Allele fre- quencies and the overall pattern of allele distribution are shown in Table 14 and Fig. 16. Est-2'', a \'ery rare allele found in only one sample, is omitted from Fig. 16. The distribution of each allele may now be considered in turn. Est-2". A rare allele whose presence is based on a single specimen of C. bejidalli from Little Abaco with a two-banded phenotype interpreted as Est-2VEst-2^ Est-2^. Another rare allele found in 12 samples of C. bendalli from Great and Little Abaco. Its isolated occurrence on Little Abaco and near Treasure Cay may be due to recurrent mutation. Its occurrence at fre- quencies of up to in ten samples from the area of interaction between C. bendalli and C. abacoense is probably due to other forces. We note that nine of these samples were of C. bendalli or intermediate mor- photype; only one (Loc. 257 at The Cross- ing) was referable to C. abacoense. In this same area, the Est-2'' allele was not detected at Locs. 259, 520, 521, 254, and 252 where snails are judged to be t)'pical C. abacoense. Est-2''. A rare allele (frequency: ) detected in heterozygous form in four populations of C. ])endaUi from western Grand Bahama. Est-2''. A common allele detected in most populations of Cerion from the Little Ba-. Please note that
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