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首页> 外文期刊>Limnology >Grazing impact on the cyanobacterium Microcystis aeruginosa by the heterotrophic flagellate Collodictyon triciliatum in an experimental pond
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Grazing impact on the cyanobacterium Microcystis aeruginosa by the heterotrophic flagellate Collodictyon triciliatum in an experimental pond

机译：在实验池塘中，异养鞭毛Collodictyon triciliatum放牧对铜绿微囊藻的影响

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摘要

We estimated the grazing impact of the heterotrophic flagellate Collodictyon triciliatum on the harmful, bloom-forming cyanobacterium Microcystis aeruginosa in an experimental pond during a Microcystis bloom from summer to winter in 2010. For these experiments, we calculated the grazing rates from the digestion rate of C. triciliatum and its food vacuole contents. During the study period, M. aeruginosa exhibited one bloom event with a maximum density of 1.1 × 105 cells ml−1. The cell density of C. triciliatum fluctuated from below the detection limit to 291 cells ml−1. The number of M. aeruginosa cells ingested by C. triciliatum food vacuoles ranged between 0.4 and 10.8 cells flagellate−1, and the digestion rate of C. triciliatum at 25 °C was 0.73 % cell contents min−1. The grazing rate of C. triciliatum on the M. aeruginosa prey was 0.2–6.9 cells flagellate−1 h−1, and its grazing impact was 0.0–25.3 % standing stock day−1. The functional response of C. triciliatum to the M. aeruginosa prey followed the Michaelis–Menten model of significance (r 2 = 0.873, p < 0.001) in our experimental systems, in which the prey concentration varied from 1.0 × 104 to 2.1 × 106 cells ml−1. The maximum grazing rate was 6.2 prey cells grazer−1 h−1, and the half-saturation constant was 1.2 × 105 cells ml−1. We present evidence that C. triciliatum grazing explained the remarkable decrease in M. aeruginosa cell density in the pond. The present study is the first demonstration of the high potential of protistan grazing on M. aeruginosa to reduce cyanobacterial blooms.
机译：我们估算了2010年夏季至冬季的微囊藻开花期间，异养鞭毛鼠齿小球藻对有害的，形成花蕾的蓝藻铜绿微囊藻的放牧影响。对于这些实验，我们根据消化率对毛状衣原体及其食物中的液泡含量。在研究期间，铜绿假单胞菌出现了一次开花事件，最大密度为1.1×105细胞ml-1。毛状衣原体的细胞密度从检测限以下波动至291细胞ml-1。毛状衣原体食物液泡摄入的铜绿假单胞菌细胞数介于0.4和10.8细胞鞭毛-1之间，而25°C下毛状衣原体的消化率为0.73％细胞含量min-1。铜绿假丝酵母猎物上的毛滴虫的放牧率为0.2–6.9细胞鞭毛-1 h-1，其放牧影响为站立日-1的0.0–25.3％。在我们的实验系统中，毛状线虫对铜绿假单胞菌猎物的功能响应遵循Michaelis–Menten显着性模型（r 2 = 0.873，p <0.001），其中猎物浓度从1.0×104到2.1×106细胞ml-1。最大放牧率是6.2个捕食细胞grazer-1 h-1，半饱和常数是1.2×105个细胞ml-1。我们目前的证据表明，毛滴虫的放牧解释了池塘中铜绿假单胞菌细胞密度的显着下降。本研究首次证明了放牧铜绿假单胞菌对减少蓝藻水华的潜力很大。

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