PULSES OF PHOSPHATE PROMOTE DOMINANCE OF THE TOXIC CYANOPHYTE CYLINDROSPERMOPSIS RACIBORSKII IN A SUBTROPICAL WATER RESERVOIR 1
PULSES OF PHOSPHATE PROMOTE DOMINANCE OF THE TOXIC CYANOPHYTE CYLINDROSPERMOPSIS RACIBORSKII IN A SUBTROPICAL WATER RESERVOIR 1
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DOI：
10.1111/j.1529-8817.2009.00675.x
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发表时间：
2009-06
影响因子：
2.9
通讯作者：
A. Posselt;M. Burford;G. Shaw
中科院分区：
文献类型：
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作者：
A. Posselt;M. Burford;G. Shaw
研究了溶解无机磷（DIP）在促进有毒氮（N）固定蓝细菌Aciddrospermopsis raciborskii（Woelosz.）Seenayya et Subba Raju在亚热带水库Samsonvale湖（=North Pine水库）进行了检查。一种新的原位生物测定方法，使用透析管而不是瓶或袋，被用来确定C。raciborskii优势，每天添加DIP。C.在2006/2007年夏天的三个独立实验中，当DIP以两种浓度（0.32 μM和16 μM）每天脉冲加入4 d时，观察到raciborskii。C.结果表明，两种DIP处理均能显著提高黑胸草细胞浓度和生物量，但氨态氮+ DIP处理则无显著影响。此外，整体浮游植物细胞浓度增加与DIP此外，表明Samsonvale湖DIP限制在实验的时间。考虑到生物测定响应，可能C.随着DIP的定期注入，如流入事件，Samsonvale湖的raciborskii可能会增加。
The role of dissolved inorganic phosphorus (DIP) in promoting dominance of the toxic nitrogen (N)‐fixing cyanobacterium Cylindrospermopsis raciborskii (Wołosz.) Seenayya et Subba Raju was examined in a subtropical water reservoir, Lake Samsonvale (=North Pine reservoir). A novel in situ bioassay approach, using dialysis tubing rather than bottles or bags, was used to determine the change in C. raciborskii dominance with daily additions of DIP. A statistically significant increase in dominance of C. raciborskii was observed when DIP was added at two concentrations (0.32 μM and 16 μM) in a daily pulse over a 4 d period in three separate experiments in the summer of 2006/2007. There was an increase in both C. raciborskii cell concentrations and biovolume in two DIP treatments, but not in the ammoniacal N + DIP treatment. In addition, overall phytoplankton cell concentrations increased with DIP addition, indicating that Lake Samsonvale was DIP limited at the time of experiments. Given the bioassay response, it is likely that dominance of C. raciborskii could increase in Lake Samsonvale with periodic injections of DIP such as inflow events.