Genome Size Evolution in New Zealand Triplefin Fishes

The genome sizes of 18 species of New Zealand triplefin fishes (family Tripterygiidae) were determined by flow cytometry of erythrocytes. The evolutionary relationships of these species were examined with a molecular phylogeny derived from DNA sequence data based on 1771 base pairs from fragments of...

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Bibliographic Details
Published in:The Journal of heredity 2005-07, Vol.96 (4), p.356-362
Main Authors: Hickey, A. J. R, Clements, K. D
Format: Article
Language:English
Subjects:
Animals
Evolution, Molecular
Evolutionary biology
Fish
Fishes - classification
Fishes - genetics
Genome
Genomics
Likelihood Functions
Phylogeny
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Summary:The genome sizes of 18 species of New Zealand triplefin fishes (family Tripterygiidae) were determined by flow cytometry of erythrocytes. The evolutionary relationships of these species were examined with a molecular phylogeny derived from DNA sequence data based on 1771 base pairs from fragments of three mitochondrial loci (12S and 16S ribosomal RNA, and the control region) and one nuclear locus (ETS2). Haploid genome sizes ranged from .85 pg (1C) to 1.28 pg with a mean of 1.15 ± .01pg. Genome size appeared to be highly plastic, with up to 20% variation occurring within genera and a 50% difference in size between the smallest and the largest genome. No evidence was found to indicate polyploidy as a mechanism for speciation in New Zealand triplefins. Factors suggested to influence genome sizes of other organisms, such as morphological complexity, neoteny, and longevity, do not appear to be associated with shifts in the genome sizes of New Zealand triplefins.
ISSN:0022-1503
1465-7333
DOI:10.1093/jhered/esi061