9327

• UCREFRP Catalog Number: 9327
• Author: Starnes, W. C.
• USFW Year: 1995.
• Copyright Material: NO

variable in frequencies among populations being fixed for one of
the other of two alleles or having differing combinations of
homo- and heterozygotes. EST-2, which in some respects, has
problematic results (see discussion below), has a range of
frequencies which nevertheless show some semblance of geographic
trends (Fig. 6) with some populations fixed homozygous for the
111" allele (e.g., Sabino Canyon, Fossil Cr., E. Verde R.), or for
112" (e.g., Verde R., W. Clear Cr.), with the majority polymorphic
as were the two Bill Williams system samples; the 111" allele
occurs with greater frequency in most samples with the exception
of those from the upper Verde system.. At GPI-1 (Fig. 7),
frequencies vary widely with a 112" allele most common (homozygous
in several populations) relative to a 113". Again, there are
geographic trends in that the 113" allele occurs in samples from
the upper Gila and upper Verde systems with little or no
occurrence in the intervening area. A somewhat similar pattern
emerges in the Gila Basin with respect to the MPI-2 locus (Fig.
10) with respect to the "5" allele which is present at low to
moderate frequencies; that allele is prevalent in the two Bill
Williams samples. On the other hand, while varying widely in
frequencies, both alleles at the PGM locus are pervasive of the
entire basin with most samples polymorphic but one (Cienega Cr.)
fixed homozygous for the 112" allele and two samples (Fossil Spg.,
Blue R.) homozygous for "1"; 112" occurs at greater frequencies in
most population samples but 111" is locally prevalent in the upper
Verde system samples.
Some loci, while being monomorphic over much of the Gila-
Bill Williams portion of the lower Colorado Basin, have some
relatively localized polymorphisms within that region. The AK-1
locus (Fig. 2) has a disjunct occurrence of the 116" allele,
otherwise known only to the north of the Gila and Bill Williams
systems and possibly one Mexican sample, in the Sheehy Spring
sample from the extreme upper Santa Cruz portion of the Gila
Basin. Based on its extreme isolation, this may represent a
separate mutation from upper basin samples. The bGAL locus (Fig.
3) has some possible rare occurrences of allele 112" (otherwise
known in the upper basin and some Mexican samples) in samples-
from the upper Verde and Tonto Creek. CBP-1 (Fig. 4) again has
localized occurrence of a 112" allele in the upper Verde otherwise
mostly known from the upper basin. IDHP-2 (Fig. 8) shows a
similar pattern with regard to the "1" allele, which is however
common in the sample from the adjacent but independant Williamson
Valley; the remoteness of these samples from upper basin samples
raises a question of homology for the 111" allele in the two
regions. The LDH-B locus (Fig. 9) has a 111" allele unique to
samples from an area centered on the upper Gila Basin exclusive
of the Salt system, being most prevalent in those from the
southerly Santa Cruz (homozygous in Cienega Cr.) and San Pedro
systems, with the possible exception of occurrence in the San
Bernadino sample from the extreme northern Yaqui drainage. At
CK-A (Fig. 5), the 112" allele, otherwise known from population
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