|SREL Reprint #0463|
Tolerance and Biochemical Polymorphism of Immature Largemouth Bass
Yardley et al. (1974) found biochemical variation in
largemouth bass that seemed to be correlated with current and past thermal
stresses on the aquatic environment caused by the operation of nuclear reactors.
One form of malate dehydrogenase (MDH-1) was found to have two alleles
(Mdh-1a) and Mdh-1 b) with heterozygotes having three
bands as previously reported for this species (Wheat and Whitt, 1971). The frequency of the alleles in a reservoir with temperatures
of 50 C+ in the central areas (Pond C; Mdh-1 a =0.66), a post-thermal
reservoir undergoing succession at ambient temperatures (Pond B; Mdh-1 a
=0.58) and a reservoir predominated by waters of nearly ambient temperatures
(Par Pond; Mdh-1 a =0.44) suggested a selective advantage of Mdh-1
a over Mdh-1 b in the hot water area.
The differences in allele frequencies in the populations inhabiting these
areas were significant and each population was in equilibrium as predicted by
the Hardy-Weinberg equations. The
objective of this study was to determine the thermal tolerance of the three MDH
genotypes in largemouth bass.
SREL Reprint #0463
Smith, M.H. and S.L. Scott. 1975. Thermal tolerance
and biochemical polymorphism of immature largemouth bass (Micropterus salmoides)
Lacepede. Bulletin of the Georgia
Academy of Science 34:180-184.