Fig. 3

Geographical distribution and phylogenetic tree for infections by microsporidia species of the genus Nosema in Gammarus roeselii. The map shows the infections found in G. roeselii (large colored dots for those detected in the present study; large colored diamonds for those detected in previous studies) and in other amphipods (small colored dots, see Additional file 4: Table S3 for further details). Dot colors match clade colors on the phylogenetic tree. The Bayesian phylogenetic reconstruction is based on a small ribosomal subunit rDNA alignment of Nosema granulosis. Nosema antherae was used as the outgroup and divergent lineages were ascribed a color code. Sequences from the present study are in bold and labels include haplogroup names, the total number of G. roeselii infected individuals (=ind.), plus other hosts found infected by the same haplogroup. Sequences from GenBank are all other Nosema granulosis haplogroups (Additional file 4: Table S3). Labels include the accession number, the species name given in the associated publication and the host species abbreviated names. For abbreviations of host species names see Additional file 4: Table S3. Abbreviation: PP, Bayesian posterior probability