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  • Size-dependent growth of Microcystis colonies in a shallow, hypertrophic lake: use of the RNA-to-total organic carbon ratio

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    Author(s)
    Li, Ming
    Zhu, Wei
    Dai, Xiaoxuan
    Xiao, Man
    Appiah-Sefah, Gloria
    Nkrumah, Philip Nti
    Griffith University Author(s)
    Xiao, Man
    Year published
    2014
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    Abstract
    Microcystis was cultured under standard conditions in BG-11 and M-11 media. Using results of an analysis of RNA and total organic carbon (TOC) content, a significant logarithmic relationship between Microcystis growth rate and the RNA/TOC ratio was described to measure the growth rate. Colonial Microcystis samples collected in a shallow, hypertrophic lake (Lake Taihu, China) during May-November 2012 were divided into six size classes (<75, 75-100, 100-150, 150-300, 300-500, and >500 μm), and the RNA/TOC ratio of each class was analyzed to evaluate differences in growth. The growth rate of colonies in the 150-300-μm size class ...
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    Microcystis was cultured under standard conditions in BG-11 and M-11 media. Using results of an analysis of RNA and total organic carbon (TOC) content, a significant logarithmic relationship between Microcystis growth rate and the RNA/TOC ratio was described to measure the growth rate. Colonial Microcystis samples collected in a shallow, hypertrophic lake (Lake Taihu, China) during May-November 2012 were divided into six size classes (<75, 75-100, 100-150, 150-300, 300-500, and >500 μm), and the RNA/TOC ratio of each class was analyzed to evaluate differences in growth. The growth rate of colonies in the 150-300-μm size class was highest from May to August, but the growth rate increased along with the increase in colony size from September to November. Our results also indicated that water temperature did not change the relationship between growth rate and colony size, but the growth rate of larger colonies was higher than the growth rate of smaller colonies at conditions of low total nitrogen, low total dissolved phosphorus concentration, and high light intensity. Taken together, these results suggest that large colonial Microcystis possess an advantage that is a consequence of this faster growth at lower nutrient concentrations and high light intensities. © 2014 Springer Science+Business Media Dordrecht.
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    Journal Title
    Aquatic Ecology
    Volume
    48
    Issue
    2
    DOI
    https://doi.org/10.1007/s10452-014-9476-1
    Copyright Statement
    © 2014Springer Netherlands. This is an electronic version of an article published in Aquatic Ecology, Volume 48, Issue 2, pp 207–217, 2014. Aquatic Ecology is available online at: http://link.springer.com// with the open URL of your article.
    Subject
    Ecology
    Science & Technology
    Life Sciences & Biomedicine
    Limnology
    Marine & Freshwater Biology
    Publication URI
    http://hdl.handle.net/10072/388806
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