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genotypically represent a distinct unit. These samples, as well <br />as those from the Mdtape drainage and San Bernadino portion of <br />Yaqui, are generally fixed homozygous for a 113" allele of <br />intermediate mobility at AK-1 (Fig. 2) while upper Papigochic <br />samples and samples from basins to the north were fixed for a "411 <br />allele or (upper Colorado Basin) had combinations of alleles. <br />However, at ID14-2 (Fig. 8), these samples only are fixed for a <br />04" allele to t"'he exclusion of all others, including the Mdtape. <br />At PK-1 (Fig. 12), these samples have a 1131, allele shared only <br />with the San Bernadino sample. <br />While there are no fixed differences among samples from the <br />Culiacan, Sinaloa, and Fuerte samples which were combined for <br />purposes of the BIOSYS analysis, some differences in allele <br />frequencies (not given separately in Table 3) do occur which <br />probably reflect the current lack of gene flow among Gila <br />populations in those drainages. At GPI-1, frequencies for the <br />112" allele are .333, 0.0, and .055, respectively, in those <br />samples; the 113" allele is .666, 1.0, and .833. At bGAL, the "2" <br />allele is .055, .200, and 0.0; the 114" allele is .944, .500, and <br />1.0. There is a possibly unique 111" allele scored at the bGAL <br />locus in the Sinaloa sample occurring at a frequency of .300. <br />As noted above, several loci scored for different alleles in <br />two samples from the upper Papigochic system of the eastern Yaqui <br />drainage. The sample from the Rio Papigochic at La Junta (JUN) <br />had completely different alleles at AK-1, bGAL, IDH-2, MPI-2, and <br />PK-1 (Figs. 2,3,8,10) than the samples from the six populations <br />described above. The sample from a Papigochic tributary at Los <br />Gavilones (GAV) had differences at AK-1, EST-2, and IDH-2 (Figs. <br />2,6,8), but partially or wholly shared alleles with those six <br />samples at bGAL and MPI-2 (Figs. 3,10) and had a yet totally <br />different allele at PK-1 (Fig. 12, shared with Rio Grande-Pecos <br />and San Bernadino samples). <br />Several of the-loci (AK-1, EST-2, IDH-2, MPI-2, and PK-1) <br />which provide differences between the upper Papigochic samples <br />and samples from elsewhere in the Yaqui and basins southward have <br />alleles scored in samples from basins to the north and/or the <br />Matape or San Bernadino samples and some are informative with <br />regard to these latter. The distinctiveness of the Mdtape sample <br />is supported by a unique combination of alleles (i.e., partially <br />shared with one or other of Yaqui forms or the San Bernadino <br />sample but not completely with either) at AK-1, EST-2, IDH-2, and <br />PK-1 (Figs. 2,6,8,12). The distinctiveness of the San Bernadino <br />sample is supported by a different combination at these same loci <br />plus being unique among these samples in possessing a slow allele <br />at LDH-B (Fig. 9) otherwise known only in some populations in the <br />Gila Basin to the north. It is noted that the sample (n=4) from <br />San Bernadino is a small one primarily procured for comparative <br />mtDNA analyses and may not reveal the full extent of variation at <br />these loci albeit from a geographically very restricted <br />3