Figure 2.

One of the three maximum-likelihood trees of Hirundo rustica mtDNA haplotypes, rooted with H. aethiopica (average uncorrected distance between these two species was 3.1%). Numbers above branches are maximum-likelihood bootstrap values (100 replicates); values below branches are Bayesian posterior probabilities, followed by maximum-parsimony bootstrap values (1000 replicates, in parentheses). Lab numbers precede locality abbreviations (see table 1 of electronic supplementary material); total number of individuals sharing the same haplotype is noted in parentheses.