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- W2094337039 abstract "The cosmopolitan dinoflagellate genus Alexandrium, and especially the A. tamarense species complex, contain both toxic and nontoxic strains. An understanding of their evolution and paleogeography is a necessary precursor to unraveling the development and spread of toxic forms. The inclusion of more strains into the existing phylogenetic trees of the Alexandrium tamarense species complex from large subunit rDNA sequences has confirmed that geographic distribution is consistent with the molecular clades but not with the three morphologically defined species that constitute the complex. In addition, a new clade has been discovered, representing Mediterranean nontoxic strains. The dinoflagellates fossil record was used to calibrate a molecular clock: key dates used in this calibration are the origins of the Peridiniales (estimated at 190 MYA), Gonyaulacaceae (180 MYA), and Ceratiaceae (145 MYA). Based on the data set analyzed, the origin of the genus Alexandrium was estimated to be around late Cretaceous (77 MYA), with its earliest possible origination in the mid Cretaceous (119 MYA). The A. tamarense species complex potentially diverged around the early Neogene (23 MYA), with a possible first appearance in the late Paleogene (45 MYA). A paleobiogeographic scenario for Alexandrium is based on (1) the calculated possible ages of origination for the genus and its constituent groups; (2) paleogeographic events determined by plate movements, changing ocean configurations and currents, as well as climatic fluctuations; and (3) the present geographic distribution of the various clades of the Alexandrium tamarense species complex." @default.
- W2094337039 created "2016-06-24" @default.
- W2094337039 creator A5028428509 @default.
- W2094337039 date "2003-04-25" @default.
- W2094337039 modified "2023-09-23" @default.
- W2094337039 title "The Application of a Molecular Clock Based on Molecular Sequences and the Fossil Record to Explain Biogeographic Distributions Within the Alexandrium tamarense Species Complex (Dinophyceae)" @default.
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- W2094337039 doi "https://doi.org/10.1093/molbev/msg105" @default.
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