. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Turks and Caicos Cerion • Gould and Woodruff 351. Figure 16. Loadings for South Caicos samples on first three varimax axes. Symbols as on Figure 14. slightly elevated levels of genetic vari- ability (P, H) and are frequently charac- terized by the segregation of rare or unique alleles at frequencies far higher than those seen in homospecific populations (Wood- ruff, 1981). In addition, several step clines in allele frequencies are associated with the hybrid zone. The pattern of clinal vari- ation (bank-edge to bank-in
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Turks and Caicos Cerion • Gould and Woodruff 351. Figure 16. Loadings for South Caicos samples on first three varimax axes. Symbols as on Figure 14. slightly elevated levels of genetic vari- ability (P, H) and are frequently charac- terized by the segregation of rare or unique alleles at frequencies far higher than those seen in homospecific populations (Wood- ruff, 1981). In addition, several step clines in allele frequencies are associated with the hybrid zone. The pattern of clinal vari- ation (bank-edge to bank-interior coasts) of several alleles on New Providence {6Pgd'\ Es-2''^, Pgm-2'-) is, in fact, quite similar to that seen on South Caicos and Providenciales. The obvious question aris- ing from the similarities of New Provi- dence and South Caicos is whether today's South Caicos populations represent the legacy of a historical interaction between two species? Has the evidence for a former bank-interior species all but disappeared on this smaller island? If the Caicos Bank had been originally occupied by a bank-edge and a bank-in- terior species comparable to those seen on the Great Bahama Bank and the Little Ba- hama Bank islands, we would make two predictions about the situation on South Caicos based on our earlier work. First, the island is too small for genetically "pure " populations of the interior taxon to endure. All living populations are found within 7 km of the bank-edge and will therefore be introgressed to varying degrees. Present. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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