Fig. 1

Genome size, transposable elements, and nucleotide composition. a Abundance of transposable elements in 29 teleosts, one non-teleost ray-finned fish (spotted gar, L. oculatus; Loc) with a AT/GC heterogeneous genome, one lobe-finned fish (L. chalumnae; Lch), one lamprey (P. marinus; Pma) and one shark (C. milii; Cmi) species related to their host genome size (genome size as C-value in picograms, pg), data from [3]. b GC percentage (GC%) of 46 fish genomes with available genome assemblies (excluding salmonids with their rediploidized genomes exceptionally enriched in extremely GC-rich rRNA genes [31]) negatively correlates with fish genome size based on averaged cytological measurements (C-value in pg, multiple C-value records were averaged). C-value data from the Animal Genome Size Database [32], GC% data from GenBank [33]. c GC% of TE consensus sequences (not accounting for their copy number within genomes) positively correlates with the overall GC% of the host genome in 25 ray-finned fish species, one lancelet (Branchiostoma belcheri; Bbe), one lamprey (Pma), one shark (Cmi) and one coelacanth included in FishTEDB [34]. Genomic GC% data are from GenBank [33], GC% of TEs was calculated from species-specific TE consensus sequence libraries from FishTEDB [34]. d GC% of genome assemblies (in Mb) of 58 fish species listed GenBank [33]