PHYLOGENETIC AFFINITIES OF AUSTRALASIAN SPECIMENS OF BATRACHOSPERMUM (BATRACHOSPERMALES, RHODOPHYTA) INFERRED FROM MOLECULAR AND MORPHOLOGICAL DATA
2006
Stewart, Sarah Anna
The phylogenetic affinities of five Australasian species of the freshwater red algal genus Batrachospermum were investigated using molecular and morphometric data. Specimens attributed to B. pseudogelatinosum, B. campyloclonum, B. kraftii, B. theaquum and B. bourrellyi, were collected from eastern Australia, Tasmania, New Caledonia and New Zealand. DNA sequence data from the plastid rbcL gene was used to infer interspecies relationships for all taxa. The mitochondrial cox2-3 gene spacer region was utilized to infer the intraspecific relationships among specimens of B. pseudogelatinosum, B. campyloclonum and B. bourrellyi. Two clades were resolved for B. pseudogelatinosum specimens in the rbcL, with B. bourrellyi placed equivocally as sister or within the clade. B. theaquum formed a separate clade in all analyses. B. kraftii specimens were placed within both of the B. pseudogelatinosum clades. Morphometric data was incongruent with the molecular data, and implications for species concepts in these Australasian taxa will be discussed.
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