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Nitrogen and phosphorus utilization in the cyanobacterium Microcystis aeruginosa isolated from Laguna de Bay, Philippines

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Date
2007
Author
Baldia, S. F.
Evangelista, A. D.
Aralar, E. V.
Santiago, A. E.
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88
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Abstract
Phytoplankton supports fisheries and aquaculture production. Its vital role as food for aquatic animals, like mollusks, shrimp, and fish cannot be overemphasized. Because of its contribution as a food source for fish, the growth kinetics of Microcystis aeruginosa, a dominant cyanobacterium in the lake, was studied. The regular occurrence of M. aeruginosa is experienced during the months of May to July or from September to November in Laguna de Bay, the largest freshwater lake in the Philippines. M. aeruginosa was collected from Laguna de Bay, isolated, and established in axenic conditions. Data on the growth kinetic parameters for nitrate-nitrogen and phosphate-phosphorus utilization by M. aeruginosa gave the following values: half-saturation constant (Ks), 0.530 mg N. L−1 and 0.024 mg P. L−1 respectively; maximum growth rate (μmax), 0.671. d−1 and 0.668. d−1 respectively; maximum cell yield, 6.5 and 6.54 log, cells. ml−1 respectively; nutrient level for saturated growth yield, 8.71 mg N. L−1 and 0.22 mg P. L−1 respectively; and minimum cell quota (Q0), 2.82 pg N. cell−1 and 0.064 pg P. cell−1 respectively. The low Ks value and high maximum growth rate (μmax) for phosphorus by M. aeruginosa would suggest a high efficiency of phosphorus utilization. On the other hand, the high Ks value for nitrogen indicated a low rate of uptake for this nutrient.
URI
http://hdl.handle.net/10862/2056
Suggested Citation
Baldia, S. F., Evangelista, A. D., Aralar, E. V., & Santiago, A. E. (2007). Nitrogen and phosphorus utilization in the cyanobacterium Microcystis aeruginosa isolated from Laguna de Bay, Philippines. Journal of Applied Phycology, 19(6), 607-613.
DOI
10.1007/s10811-007-9209-0
Subject
growth rate ASFA; freshwater lakes ASFA; estuaries ASFA; brackishwater environment ASFA; phytoplankton ASFA; freshwater aquaculture ASFA; primary production ASFA; fish culture ASFA; nitrogen ASFA; aquatic animals ASFA; data processing ASFA; phosphorus ASFA; aquaculture ASFA; lakes ASFA; kinetics ASFA; food resources ASFA; fisheries ASFA; freshwater molluscs ASFA; yields ASFA; algal blooms ASFA; Nutrients; Microcystis; Mollusca; Microcystis aeruginosa; Philippines; Cell quota; Cyanobacterium
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