Median-Joining network of barn swallow populations computed on mtDNA haplotypes with network.

<p>Size of circles is proportional to the haplotype frequency. The colour of each population is indicated as well as the number of each haplotype. A length bar to compute the number of mutational changes was provided (see also <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0098574#pone.0098574.s002" target="_blank">Table S1</a>). The inset showed Mismatch Distribution (MD) of the mtDNA pairwise differences (observed: dotted; expected: line) computed on the whole dataset (<i>n = </i>76). The expected curve was obtained from simulated values computed from the data under the model of demographic expansion (H₀). The Harpending's raggedness index (<i>r</i>) was given with the <i>P</i> value of the SSD test as well as Tajima's <i>D</i>, Fu's <i>F</i>_S and <i>R</i>₂ statistics.