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
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