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12th International Conference on Harmful Algae

12th International Conference on Harmful Algae

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INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <str<strong>on</strong>g>Internati<strong>on</strong>al</str<strong>on</strong>g> <str<strong>on</strong>g>C<strong>on</strong>ference</str<strong>on</strong>g> <strong>on</strong> <strong>Harmful</strong> <strong>Algae</strong>, Copenhagen, Denmark, 4-8 September 2006R. Wayne Litaker, Patricia TesterNati<strong>on</strong>al Ocean Service, NOAA,BEAUFORT, NC, United States of AmericaDinoflagellate tax<strong>on</strong>omy is based <strong>on</strong>morphological criteria that areinherently more difficult to obtainthan are corresp<strong>on</strong>ding DNAsequence data. This results in therapid accumulati<strong>on</strong> of sequenceinformati<strong>on</strong> indicating many morespecies exist than can beadequately described given theextant morphological data.Currently, no method exists forsystematically categorizing thesesequences into potential speciesgroups for use in ecological studiesor for tax<strong>on</strong>omic characterizati<strong>on</strong>.We examined whether geneticdistances am<strong>on</strong>g ITS1/5.8S/ITS2rDNA sequences could be used forthis purpose. The analysis involvedidentifying sequences from 81dinoflagellate species to determineif simple uncorrected geneticdistances (p) above a certain levelc<strong>on</strong>sistently correlate with knownspecies boundaries. For a diverseassemblage of dinoflagellatespecies, the within species geneticdistances between ITS1/5.8S/ITS2copies (p=0.000-0.021 substituti<strong>on</strong>sper site) were c<strong>on</strong>sistently less thanthose observed between species(p=0.042-0.580). Our resultsindicate that a between speciesuncorrected genetic difference>0.04 could be used to delineatemost dinoflagellate species,including cryptic forms. Recentlyevolved species, however, mayhave ITS p values

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