Additional file 1.

Average GC content at the third codon position for sequences belonging to each species. BP=Brachionus plicatilis (monogonont); PF =P. flaviceps; AV=A. vaga; AR=A. ricciae; MQ=M. quadricornifera. Kruskal-Wallis test for variation among species: chi-squared = 41.9, df = 3, p<0.0001.

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Eyres et al. BMC Evolutionary Biology 2012 12:148   doi:10.1186/1471-2148-12-148