Biochemical Evidence of Stock Differentiation in the Bloater (Coregonus hoyi) in Lake Michigan
File(s)
Date
1986-09Author
Schrock, Robin M.
Publisher
University of Wisconsin-Stevens Point, College of Natural Resources
Metadata
Show full item recordAbstract
Electrophoretic analysis of five samples of the bloater,
Coregonus hoyi, from five geographic areas in the Wisconsin
waters of Lake Michigan in two successive years indicated
that genetic differences among samples were too low to detect
the presence of distinct stocks. Although significant
heterogeneity among locations was found in 1982, it was in
the form of a gradual south - north allele frequency cline at
one polymorphic locus, PGM-C, in liver. Cluster analysis
(UPGMA) of Cavalli-Sforza and Edwards chord distances
between samples produced a dendrogram representative of a
continuously distributed population. Absence of activity
at the PGM loci in the 1983 samples weakened comparison of
diversity between years, and the remaining loci analyzed in
1983 did not show differences among locations.
Four samples from three areas in one year from Michigan
waters indicated the presence of three stocks of bloaters.
Significant differences in allele frequencies among samples
from Frankfort, Ludington, and Saugatauk were found at the
IDH-B liver loci. No such differences were found at the same
loci in Wisconsin samples, indicating that fish from the east
and west side of the lake are genetically different.