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Genome size variation in the North American sunfish genus Lepomis (Pisces: Centrarchidae)

Published online by Cambridge University Press:  14 April 2009

Chara J. Ragland  and
John R. Gold
Chara J. Ragland
Affiliation:
Department of Wildlife and Fisheries Sciences, Texas A & M University, College Station, Texas 77843, U.S.A.
John R. Gold*
Affiliation:
Department of Wildlife and Fisheries Sciences, Texas A & M University, College Station, Texas 77843, U.S.A.
*
† Corresponding author.
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Genome sizes (nuclear DNA contents) were documented spectrophotometrically from individuals of each of nine species of the North American centrarchid (sunfish) genus Lepomis. The distributions of DNA values within and among the nine species were essentially normal and continuous, suggesting that changes in DNA quantity in Lepomis are small in amount, involve both gains and losses of DNA, and are cumulative and independent in effect. Significant differences in mean genome size were found between individuals within populations in all nine species and between species. Nested analysis of variance and comparisons of average genome size difference or distance between individuals drawn from different levels of taxonomic organization revealed that the majority of genome size divergence in Lepomis occurs above the hierarchical level of individuals within populations. The Lepomis data when compared to similar data from North American cyprinid fishes appear to suggest that: (i) genome size evolution in these fishes at least follows a continuous rather than a discontinuous mode; (ii) the general predictions of hypothetical models relating genome size variation as a function of organismal position along adaptive continua may be oversimplified, or not applicable to complex, higher eukaryotes; and (iii) changes in genome size in these fishes may be concentrated in speciation episodes.

Type
Research Article
Information
Genetics Research , Volume 53 , Issue 3 , June 1989 , pp. 173 - 182
Copyright
Copyright © Cambridge University Press 1989

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