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Morphology and physico-ecology of two rare freshwater epilithic diatoms: Hydrosera whampoensis and Pleurosira laevis

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We isolated two rare centric diatoms, Hydrosera whampoensis (Schwarz) Deby and Pleurosira laevis (Ehrenberg) Compère from Sinchun Stream in Daegu City (South Korea). We examined their morphology and ultrastructures by LM and SEM, and measured their population growth (number of cells at 24 ~32 days) and growth rate during the exponential phase at different temperatures and with different nutrient concentrations in unialgal cultures. H. whampoensis had maximal population growth and growth rate at 18°C, but P. laevis had maxima at 24°C. The maximum population growth and growth rate of both species was at 32 μM nitrate (NO3–). H. whampoensis and P. laevis had maximum growth rates at 25 μM phosphate (PO4 –3), whereas H. whampoensis had maximum population growth at 10 μM PO4 –3 and P. laevis had maximum population growth at 25 μM PO4 –3.
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Keywords: GROWTH CHARACTERISTICS; HYDROSERA WHAMPOENSIS; PLEUROSIRA LAEVIS; SEM

Document Type: Research Article

Publication date: August 1, 2017

This article was made available online on October 24, 2016 as a Fast Track article with title: "Morphology and physico-ecology of two rare freshwater epilithic diatoms: </i>Hydrosera whampoensis</i> and <i>Pleurosira laevis</i>".

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  • Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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