Fig. 2

Phylogeny of the genomic repertoires of arthropod aquaporins compared to the tetraploid complement in Atlantic salmon. a Maximum likelihood of arthropod orthodox aquaporins. The tree is rooted with AqpM and was inferred from 30 million MCMC generations on 484,924 nucleotide sites from a codon alignment of 350 non-redundant aquaporins. Posterior probabilities of the codon/amino acid analyses are shown at each node, with “-“ representing a polytomy (<50 %). The numbers of taxa are indicated in the collapsed branch triangles. Scale bars indicate the rate of nucleotide substitution per site. b Bayesian majority-rule phylogeny of arthropod unorthodox aquaporins. The tree is mid-point rooted and was inferred from 5 million MCMC generations on 87,613 nucleotide sites in a codon alignment of 94 non-redundant aquaporins. Annotations as in (a). c Genomic organisation of the salmon louse aquaporins. Colored and gray boxes indicate coding and non-coding exons, respectively. Long introns are annotated in kb, and gray backgrounds linking paralogs highlight conserved exons. Exon numbers are annotated with roman numerals, with the first proximal and distal exons of splice variants labelled A and B, respectively. d Gene copy numbers and orthology of salmon louse and Atlantic salmon aquaporins