Variation in PGI-1 frequencies. Because PGI-4 is
the only other common allele, it decreases in
frequency as PGI-1 increases. For example, in BPC,
the frequency of PGI-4 is 0.8, while in RC it is
Spatial and Temporal
- We collected1600 beetles in
1988 and 1300 beetles in 1996 and screened them
at five polymorphic enzymes.
- PGI-1 predominated in RC,
but was rare in BPC. PGI-4 was rare in RC but
predominated in BPC.
- PGI frequencies did not
change in BPC and RC during the 8 years between
samples. In BC, PGI-1 frequencies increased by
selection on PGI in Bishop Creek
- PGI-1 increased in frequency
at all four sites between 1988 and 1996.
- No other enzyme showed a
consistent increase in frequency of a single
- This indicates that PGI-1
was selectively favored between 1988 and
PGI-1 frequencies in BC, shown for each site in