Means (± SE) of the bacterial/host gene copy ratio and statistical tests^a.

Abstract

a<p>Values correspond to the mean number of symbiont gene copies ± SE (<i>16S rDNA</i> for <i>Portiera</i>, <i>dnaK</i> for <i>Hamiltonella</i> and <i>gltA</i> for <i>Rickettsia</i>) divided by the number of nuclear gene copies (<i>actin</i> gene). Kruskal-Wallis and Mann-Whitney nonparametric tests were performed with a probability level of significance of 0.05. Means marked with the same letter are not significantly different (Mann-Whitney test). For Kruskal-Wallis tests, p-values are indicated. Bold typeface indicates significant effects. <i>n</i> -number of individuals used for the quantifications.</p