Article Abstract:
Evolutionary implications in the relationship between body size and genome size in copepods and flatworms have been studied. Genome and body sizes were measured in 38 turbellarian flatworm species and 16 copepod crustaceans species. Significant positive relations were seen between genome size and body size in both. Increases in cell volume are reinforced by greater cell numbers, or cell volumes show positive allometric variation with genome size. Genome sizes seem to vary discontinuously among congeneric species in both so such changes would have come on rapidly with potentially profound effects on important morphology.
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Article Abstract:
Distinct representatives of the mariner family transposable elements were found in the genomes of three flatworm species and two fresh water hydra species. The closest relatives of these mariners were often found in insects. Therefore, it was assumed that transphyla horizontal transfers took place. Other representatives of the phyla did not exhibit mariner transposons in their genomes.
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Article Abstract:
The sequencing of the genomes of two of the most abundant pelagic bacteria, namely Pelagibacter ubique and Prochlorococcus marinus, reveals that they have two of the smallest genomes of any known free-living bacteria. These new genomic studies on some of the smallest oceanic bacteria offer valuable insights into the governing rules of bioeconomic evolution.
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