CGDP - ESU Status

Based on mtDNA sequences, the distinctive status of each taxon is estimated based on the criteria discussed below.

    

 

 
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FLMNH 2005


 

ESU vs. OTU criteria. Phylogram showing the relationships among members of the Pacific Cribrarula subclade, with bootstrap values for major groups. Four distinct clades are evident, and the names presented on the right: Cribrarula catholicorum, C. gaskoini, C. astaryi, and C. cumingii. Note that single individuals of two newly included taxa, C. taitae and C. garciai (white stars), nest within two of the major clades and show little variation (a single mutation). These two new taxa are introduced as OTUs, because of their distinct morphology and geography (American Samoa and Easter Island, respectively), but are currently not considered ESUs by molecular criteria. All ESUs must be reciprocally monophyletic, meaning that all members share a unique common ancestor - they are on (or have been on) independent evolutionary trajectories. All individuals from the Marquesas are C. astaryi; however, two individuals of C. cumingii possess haplotypes belonging to the C. astaryi clade as well (dark stars). While the two haplotype clusters are distinct, the pattern indicates uni-directional exchange of larvae downstream from the Marquesas (C. astaryi). Molecular criteria recognize these two clades as ESUs with historically limited exchange. (TIK = Tikehau, RR = Rangiroa, HUA = Huahine, all C. astaryi from Marquesas, all C. gaskoini from Hawaii, and all C. catholicorum from Solomon Islands).