Taxon-specific and seasonal variations in flagellates grazing on heterotrophic bacteria in the oligotrophic Lake Annecy - importance of mixotrophy
Taxon-specific and seasonal variations in flagellates grazing on heterotrophic bacteria in the oligotrophic Lake Annecy - importance of mixotrophy
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DOI：
10.1016/s0168-6496(03)00248-4
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发表时间：
2003-12-05
影响因子：
4.2
通讯作者：
Fontvieille, D
中科院分区：
文献类型：
--
作者：
Domaizon, I;Viboud, S;Fontvieille, D
我们调查了鞭毛虫组合的分类组成和分类特定的细菌放牧率的异养和兼养鞭毛虫在贫营养的阿讷西湖（法国）。细菌放牧率的细菌生产的比较表明，从细菌隔室到鞭毛虫的高转移效率。异养型鞭毛虫的人均放牧率为1.2 × 10（3）~ 5.1 × 10（6）个细菌l（-1）h（-1），兼养型鞭毛虫的人均放牧率为4.8 × 10（6）~ 6.8 × 10（7）个细菌l（-1）h（-1）。异养鞭毛虫中的食虫细菌主要是Katablepharis，兼养鞭毛虫中的食虫细菌主要是Dinobryon。我们的研究结果表明，细菌摄入一个给定的鞭毛虫类群的季节性变化，可以变化高达30倍。我们还提供证据表明，混合营养鞭毛虫代表了一个重要的环节，通过在阿讷西湖的浮游食物网的材料通量，这表明在官能团内的混合营养体的引入可以提高我们对碳通量途径的理解。(C)2003年，欧洲微生物学会联合会。Elsevier B. V.出版，保留所有权利。
We investigated the taxonomic composition of flagellate assemblages and taxon-specific bacterial grazing rates of heterotrophic and mixotrophic flagellates in the oligotrophic Lake Annecy (France). The comparison of bacterial grazing rates to bacterial production demonstrated a high transfer efficiency from the bacterial compartment up to flagellates. Per capita grazing rates ranged from 1.2 X 10(3) to 5.1 X 10(6) bacteria l(-1) h(-1) for heterotrophic flagellates, and from 4.8 X 10(6) to 6.8 X 10(7) bacteria l(-1) h(-1) for mixotrophic flagellates. The main bacterial grazers were Katablepharis within heterotrophic flagellates and Dinobryon within mixotrophic flagellates. Our results show that bacterial ingestion by a given flagellate taxon changed seasonally and could vary up to 30-fold. We also provide evidence that mixotrophic flagellates represent an important link in the flux of materials through planktonic food webs in Lake Annecy, suggesting that the introduction of mixotrophs within functional groups could improve our understanding of carbon flux pathways. (C) 2003 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.