|SREL Reprint #0399|
Biochemical Genetics of Sunfish. II.
C. Avise and M. H. Smith
Electrophoretic variation in proteins encoded by 18
genetic loci was examined in 1,099 specimens of 10 species of sunfish (Lepomis),
a group renowed for its ability to hybridize, both in the laboratory and in
nature. Populations belonging to
the same species show very little genic differentiation over considerable
geographic ranges. Species pairs
show major differences in allelic composition at an average of about one-half of
their loci, although the range is considerable. Thus despite ability to hybridize to the F1, Lepomis
species have very different gene pools.
Close genic similarity is not a necessary corollary of hybridizing
A dendrogram formed by a cluster analysis of genic
similarity coefficients corresponds only mildly with previously developed
classifications based on morphology. Biochemical
species groups in Lepomis appear as follows:
(1) L. cyanelkus; (2) L. macrochirus, L.
humulis, L. gulosus; (3) L. marginatus, L.
megalotis, L. microlophus; and (4) L. gibbosus,
L. punctatus, L. auritus.
Groups 3 and 4 appear quite similar and could be lumped into one cohort.
The rather close genic similarity of L. gulosus to L.
macrochiurs is surprising and is not supported by morphological evidence.
The discrepancy in similarity matrices based on morphology and proteins
of Lepomis species makes it clear that electrophoretic methods provide
additional information relevant to the subgeneric systematics of fishes.
Keywords: Par Pond Reservoir System
SREL Reprint #0399
Avise, J.C. and M.H. Smith. 1974. Biochemical genetics of sunfish. II. Genic similarity between hybridizing species. The
American Naturalist 108:458-472.