Protistan grazing in a meromictic freshwater lake with anoxic bottom water.
Protistan grazing in a meromictic freshwater lake with anoxic bottom water.
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原生生物在缺氧底层淡水湖中放牧
DOI：
10.1111/1574-6941.12257
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发表时间：
2014
影响因子：
4.2
通讯作者：
Stoeck
中科院分区：
文献类型：
--
作者：
Oikonomou;Pachiadaki;Stoeck
吞噬原生生物是大多数水生生境中原核生物的重要死亡因素。然而，没有研究评估原生生物放牧作为温带淡水半叠湖层化梯度细菌生物量损失因素。在阿拉特湖（德国）的混合层、过渡带和硫化物缺氧莫莫层中对原生动物的放牧效应进行了量化。使用来自天然原核生物组合的猎物类似物进行放牧实验。日放牧效果从混合放牧到单放牧有所下降。异养鞭毛虫在所有三个水层和monimolimnion中的主要食草动物中都具有吞噬活性。有色素的鞭毛虫占混合动物总吃草量的 70%，而纤毛虫仅占每个深度的一小部分。原核生物量去除在界面处达到峰值，但原生生物对各自原核生物丰度的影响较低。缺氧环境中的放牧量可以忽略不计，原核生物的周转率仅为活畜的0.4%。我们的结果支持这样的假设，即缺氧水域中原生生物的捕食程度低于含氧水域，并将该界面确定为支持高食草动物生物量的微生境，明确了紫硫细菌作为上部混合层和底部莫莫层碳源的重要性。
Phagotrophic protists are an important mortality factor of prokaryotes in most aquatic habitats. However, no study has assessed protistan grazing as loss factor of bacterial biomass across the stratification gradient of a temperate freshwater meromictic lake. Protistan grazing effect was quantified in the mixolimnion, the transition zone, and the sulfidic anoxic monimolimnion of Lake Alatsee (Germany). Grazing experiments were performed using prey analogues from the natural prokaryotic assemblage. Daily grazing effect declined from the mixolimnion to the monimolimnion. Heterotrophic flagellates were phagotrophically active in all three water horizons and the main grazers in the monimolimnion. Pigmented flagellates accounted for 70% of total grazing in the mixolimnion and ciliates only for a small fraction of grazing in each depth. Prokaryotic biomass removal peaked in the interface, but protistan impact on the respective prokaryotic abundance was low. Grazing in the anoxic monimolimnion was negligible, with prokaryotic turnover rate being only 0.4% of standing stock. Our results support the assumption that protistan predation in anoxic waters is lower than in oxygenated ones and identify the interface as a microhabitat that supports high grazer biomass, pinpointing the importance of purple sulfur bacteria as carbon source for the upper mixolimnion and the bottom monimolimnion.
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DOI：
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发表时间：
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期刊：
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影响因子：
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通讯作者：
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催化报告的沉积荧光原位杂交方案评估混合营养原生生物的吞噬作用
影响因子：
4.4
作者：
J. M. Medina;M. Felip;E. Casamayor
通讯作者：
E. Casamayor
影响因子：
2.1
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影响因子：
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作者：
G. Taylor;Maria Iabichella;R. Varela;Xueju Lin;M. Scranton
通讯作者：
M. Scranton
影响因子：
4.2
作者：
Domaizon, I;Viboud, S;Fontvieille, D
通讯作者：
Fontvieille, D