The incidence and known distribution of paralytic shellfish poison- producing Alexandrium dinoflagellates have both increased dramatically in recent decades. This thesis explores the phylogeny, taxonomy, and biogeography of Alexandrium in light of this expansion. Alexandrium rDNA sequence phylogeny did not correlate with morphological traits traditionally used to identify and group species. The morphospecies of the tamarensis complex, A. catenella, A. tamarense, and A. fundyense, did not represent valid species by ...
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