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  • Variations in carbon-to-phosphorus ratios of two Australian strains of Cylindrospermopsis raciborskii

    Author(s)
    Willis, Anusuya
    Posselt, Amanda J
    Burford, Michele A
    Griffith University Author(s)
    Burford, Michele A.
    Ind, Amanda J.
    Willis, Anusuya
    Year published
    2017
    Metadata
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    Abstract
    The toxic cyanobacterium Cylindrospermopsis raciborskii can form large blooms in freshwater systems, causing water quality problems. The availability of the essential macronutrient phosphorus (P), has a big impact on bloom formation but the variation in physiological response of different strains of C. raciborskii to available P has not previously been examined. This study investigated the carbon:phosphorus (C:P) ratio of two toxic Australian strains of C. raciborskii, AWT205 and NPD, under a range of P concentrations in batch and continuous cultures. P was added as a single dose to batch cultures and in continuous cultures ...
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    The toxic cyanobacterium Cylindrospermopsis raciborskii can form large blooms in freshwater systems, causing water quality problems. The availability of the essential macronutrient phosphorus (P), has a big impact on bloom formation but the variation in physiological response of different strains of C. raciborskii to available P has not previously been examined. This study investigated the carbon:phosphorus (C:P) ratio of two toxic Australian strains of C. raciborskii, AWT205 and NPD, under a range of P concentrations in batch and continuous cultures. P was added as a single dose to batch cultures and in continuous cultures at P concentrations of 0.032, 0.16, 0.64 and 16 μmol P l−1. Cellular carbon and phosphorus content of both strains increased under P-limited conditions (0 μmol P l−1 addition) with zero growth. Strain NPD had a lower C:P ratio (34:1) than AWT205 (150:1) indicating higher P storage capacity, and strain NPD survived P-limited conditions for longer. There was no significant difference in exponential growth rates (0.2 d−1, P ≥ 0.5) under all P concentrations for both strains, with the exception of no P, demonstrating non-P-limited growth even at the lowest concentration (0.032 µmol P l−1) and no increase in growth rate with additional P. 33P uptake measurements were used to show that these strains both have very low half saturation constants (Ks = 0.02 μmol P l−1) compared with other phytoplankton and strains of C. raciborskii. This is indicative of high uptake affinities and suggests that these strains are highly adapted to a low P supply. Overall the results of this study are consistent with the P strategy of storage prioritization over growth rate, and demonstrate differences between the strains in the C:P ratio under P-limitation, indicating variation in P storage.
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    Journal Title
    European Journal of Phycology
    Volume
    52
    Issue
    3
    DOI
    https://doi.org/10.1080/09670262.2017.1286524
    Subject
    Plant Biology not elsewhere classified
    Plant Biology
    Publication URI
    http://hdl.handle.net/10072/344523
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