Figure 10

Phylogenetic tree showing the relationships between the reverse transcriptase domains from the CAMERA database, retroviruses, and LTR retrotransposons. The tree was constructed with the NJ method using the SplitsTree4 software [59]. The bootstrap values were calculated over 1,000 iterations and are indicated for two basal nodes. GOS sequences are labeled by a two- letter code indicating their geographic provenance: Caribbean Sea (CA), Eastern Tropical Pacific (ET), Galapagos Islands (GI), Indian Ocean (IO), North American East Coast (NA), Polynesia Archipelagos (PA), Sargasso Sea (SS); followed by a number indicating filter size: 0.1-0.8 (1), 0.22-0.8 (2), 0.8-3.0 (3), 3.0-20.0 (4). These labels appear with blue background. Species abbreviations: P. mt (Pseudonitzschia multistriata); P. m (Pseudonitzschia multiseries); F. c (Fragilariopsis cylindrus); C. r (Chlamydomonas Reinhardtii); O. t (Ostreococcus tauri); A.a (Aureococcus anophagefferens).