Genome size differentiates co-occurring populations of the planktonic diatom Ditylum brightwellii (Bacillariophyta) |
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Authors: | Julie A Koester Jarred E Swalwell Peter von Dassow and E Virginia Armbrust |
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Institution: | (1) School of Oceanography, University of Washington, Box 357940, 98195-7940 Seattle, WA, USA;(2) Evolution du Plancton et PaleoOceans, Station Biologique de Roscoff, CNRS, UMR7144, BP 74, 29682 Roscoff, France |
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Abstract: | Background Diatoms are one of the most species-rich groups of eukaryotic microbes known. Diatoms are also the only group of eukaryotic
micro-algae with a diplontic life history, suggesting that the ancestral diatom switched to a life history dominated by a
duplicated genome. A key mechanism of speciation among diatoms could be a propensity for additional stable genome duplications.
Across eukaryotic taxa, genome size is directly correlated to cell size and inversely correlated to physiological rates. Differences
in relative genome size, cell size, and acclimated growth rates were analyzed in isolates of the diatom Ditylum brightwellii. Ditylum brightwellii consists of two main populations with identical 18s rDNA sequences; one population is distributed globally at temperate latitudes
and the second appears to be localized to the Pacific Northwest coast of the USA. These two populations co-occur within the
Puget Sound estuary of WA, USA, although their peak abundances differ depending on local conditions. |
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