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Trophic coupling of a testate amoeba and Microcystis species in a hypertrophic pond

机译：营养丰富的池塘中睾丸变形虫和微囊藻物种的营养耦合

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摘要

Seasonal changes in abundance of the testate amoeba Penardochlamys sp. and its food vacuole contents were investigated in relation to blooms of the cyanobacteria Microcystis spp. in a hypertrophic pond from April 1999 to March 2000. The behavior of the amoeba feeding on M. aeruginosa and M. wesenbergii was also observed in the laboratory. The amoeba was detectable from late May to November 1999 during the blooms of Microcystis spp. Cell densities of the amoeba fluctuated between 1.4 and 350 cells ml(-1) with some sporadic peaks, which did not coincide with rapid decreases in the abundance of Microcystis spp. Food vacuoles contained only Microcystis cells; other prey items were not found, suggesting that this amoeba utilized only the cyanobacteria as food. The amoeba was frequently found attached to Microcystis colonies, but was not associated with other suspended particles. Observation of the amoeba feeding revealed the feeding mechanism and that the amoeba was able to graze on both species of Microcystis. These results suggest that the trophic coupling of these organisms is substantial, although grazing by the amoeba is not sufficient to regulate the dynamics of Microcystis populations in this hypertrophic pond.
机译：睾丸阿米巴Penardochlamys sp的丰度的季节性变化。并研究了其食物液泡含量与蓝藻微囊藻的繁殖有关。从1999年4月至2000年3月，在肥厚的池塘中繁殖。在实验室中还观察到变形虫以铜绿假单胞菌和韦森伯格氏菌为食的行为。在1999年5月下旬至11月11日的微囊藻属（Microcystis spp）开花期间可检测到变形虫。变形虫的细胞密度在1.4和350个细胞ml（-1）之间波动，并具有一些零星的峰值，这与微囊藻的丰富度迅速下降并不相符。食物的液泡只含有微囊藻细胞。未发现其他猎物，表明该变形虫仅利用蓝细菌作为食物。变形虫经常被发现附着在微囊藻菌落上，但与其他悬浮颗粒无关。观察变形虫的摄食揭示了其摄食机理，并且变形虫能够在两种微囊藻上吃草。这些结果表明，尽管变形虫的放牧还不足以调节该肥大池塘中微囊藻种群的动态，但这些生物体的营养耦合却是充分的。

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