Competitive growth characteristics between Microcystis aeruginosa and Cyclotella sp. accompanying changes in river water inflow and their simulation model
Competitive growth characteristics between Microcystis aeruginosa and Cyclotella sp. accompanying changes in river water inflow and their simulation model
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DOI：
10.1111/pre.12129
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发表时间：
2016-05
影响因子：
1.5
通讯作者：
Masahiro Mikawa;K. Sugimoto;Y. Amano;M. Machida;F. Imazeki
中科院分区：
文献类型：
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作者：
Masahiro Mikawa;K. Sugimoto;Y. Amano;M. Machida;F. Imazeki
20世纪70年代，在日本湖泊水质最差的时候，观察到夏季以蓝藻（主要为微囊藻属）为优势种。2000年以来，为改善水质，将Tone河的大量水排入Tega湖，水质得到改善，藻类优势种由蓝藻向硅藻（主要为Cyclotella属）转变。虽然包括养分浓度和每日更新率(d)在内的几个因素可能与藻类优势物种的演替有关，但这些影响尚未得到很好的理解。本研究通过单培养和单氧培养实验，研究了日更新速率和硝态氮（以下简称氮）浓度(N)对铜绿微囊藻蓝藻和硅藻环藻竞争的影响。在实验结果的基础上，建立了模拟模型，预测了各物种的竞争生长模式。单氧培养实验表明，M。在N = 0.5 （1.0 mg‐N L−1）和d = 5%、15%和20%的条件下，铜绿假单胞菌战胜了环孢菌。M的统治。与Cyclotella sp相比，铜绿假单胞菌的半饱和常数和最小氮细胞配额值更小，而Cyclotella sp具有更高的氮细胞配额和氮吸收率，主要是氮浓度（N = 1.0 mg L−1）和每日更新率（d = 30%）的增加。M .的竞争增长模式。通过模拟模型可以大致预测铜绿假单胞菌和Cyclotella sp.。这些结果表明，日更新速度和氮浓度会影响米氏菌间的竞争，并成为米氏菌间哪种物种优势的影响因素。铜绿菌和环菌。
When the water quality in Lake Tega was the worst among Japanese lakes in the 1970s, cyanobacteria (mainly the genus Microcystis) were observed to be the dominant species in the summer. Since 2000, for water quality improvement, a large amount of the Tone River water was discharged into Lake Tega, resulting in an improvement in the water quality together with transition of algal dominant species from cyanobacteria to diatoms (mainly the genus Cyclotella). Although several factors including nutrient concentration and daily renewal rate (d) could have been related to the succession of algal dominant species, these effects have not been understood very well. This study investigated the effects of the daily renewal rate and nitrate‐nitrogen (hereafter nitrogen) concentration (N) on the competition between the cyanobacterium Microcystis aeruginosa and the diatom Cyclotella sp. through monoculture and monoxenic culture experiments. Based on the experimental results, a simulation model was constructed to predict the competitive growth pattern of each species. Monoxenic culture experiments showed that M . aeruginosa outcompeted Cyclotella sp. under conditions of N = 0.5 (1.0 mg‐N L−1) and d = 5, 15, and 20%. The domination of M . aeruginosa could be attributed to smaller values for the half‐saturation constant and the minimum nitrogen cell quota for this species with respect to Cyclotella sp. However, Cyclotella sp., possessing higher values of nitrogen cell quota and nitrogen uptake rate, dominated by an increasing nitrogen concentration (N = 1.0 mg L−1) and daily renewal rate (d = 30%). The competitive growth patterns of M . aeruginosa and Cyclotella sp. could roughly be predicted by the simulation model. These results suggested that the daily renewal rate as well as the nitrogen concentration, could affect the competition and be influential factors as to which species dominates between M . aeruginosa and Cyclotella sp.