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Gross karyotypic change and evolution in North American cyprinid fishes*

Published online by Cambridge University Press:  14 April 2009

J. R. Gold ,
W. D. Womac ,
F. H. Deal  and
J. A. Barlow Jr
J. R. Gold
Affiliation:
Genetics Section, Texas A & M University, College Station, Texas 77843, U.S.A.
W. D. Womac
Affiliation:
Genetics Section, Texas A & M University, College Station, Texas 77843, U.S.A.
F. H. Deal
Affiliation:
Genetics Section, Texas A & M University, College Station, Texas 77843, U.S.A.
J. A. Barlow Jr
Affiliation:
Genetics Section, Texas A & M University, College Station, Texas 77843, U.S.A.
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We have examined karyotypes of five species from five genera of cyprinid fishes endemic to the central and southeastern United States: Campostoma anomalum, Hybognathus hayi, Hybopsis aestivalis, Phenacobius mirabilis, and Pimephales vigilax. All five have a diploid chromosome number of 50. Variation in chromosome arm number among the five species is slight, and may be due to measurement error or technique difficulties. The karyotypes of 40 North American cyprinids are now known. All but five species have 50 (diploid) chromosomes. Variation in chromosome arm number also appears minimal; one-armed chromosomes (centromeres subterminal to terminal) normally comprise only a small fraction of the karyotype, and each species has roughly the same number of chromosomes with median and submedian centromeres. The conservatism of gross chromosomal evolution among these fishes is not in accord with recent hypotheses which suggest that progressive evolution of organisms may depend to a large degree on gene rearrangement brought about by gross chromosomal restructuring. Cyprinids are a highly speciose group in North America, and there is relatively strong morphological differentiation among species. The present data suggest that gross chromosomal restructuring may play only a minor role in the speciation and evolution of these fishes.

Type
Research Article
Information
Genetics Research , Volume 32 , Issue 1 , August 1978 , pp. 37 - 46
Copyright
Copyright © Cambridge University Press 1978

References

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