Figure 3 from: Nijman V, Vonk R, Roselaar K, van Brandwijk H, Beentjes K (2013) DNA barcoding of Dutch birds. ZooKeys 365: 25-48. https://doi.org/10.3897/zookeys.365.6287

Figure 3 - Haplotype networks constructed with statistical parsimony based on 694 bp of the mitochondrial cytochrome c oxidase subunit I gene (COI) of the Sylvia group (25 individuals). Each circle represents one haplotype; size of circles is proportional to haplotype frequency.