Successful predation of filamentous bacteria by a nanoflagellate challenges current models of flagellate bacterivory

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	Successful predation of filamentous bacteria by a nanoflagellate challenges current models of flagellate bacterivory
	Wu, QL; Boenigk, J; Hahn, MW
刊名	APPLIED AND ENVIRONMENTAL MICROBIOLOGY
	2004
卷号	70 期号:1 页码:332-339
ISSN号	0099-2240
英文摘要	Current models suggest that (i) filamentous bacteria are protected against predation by nanoflagellates, (ii) prey size is positively correlated with prey-predator contact probability, and (iii) contact probability is mainly responsible for size-selective predation by interception-feeding flagellates. We used five strains of filamentous bacteria and one bacterivorous nanoflagellate, Ochromonas sp. strain DS, to test these assumptions. The five strains, including one spirochete and four Betaproteobacteria strains, were isolated by the filtration-acclimatization method. All five strains possess flexible cells, but they differ in average cell length, which ranged from 4.5 to 13.7 mum. High-resolution video microscopy was used to measure contact, capture, and ingestion rates, as well as selectivity of the flagellate feeding. Growth and feeding experiments with satiating and nonsatiating food conditions, as well as experiments including alternative well-edible prey, were performed. In contrast to predictions by current models, the flagellate successfully consumed all the tested filamentous strains. The ingestion rate was negatively correlated with bacterial length. On the other hand, the lengths of the filamentous bacteria were not positively correlated to the contact rate and capture rate but were negatively correlated to ingestion efficiency. In experiments including alternative nonfilamentous prey, the flagellates showed negative selection for filamentous bacteria, which was independent of food concentration and is interpreted as a passive selection. Our observations indicate that (i) size alone is not sufficient to define a refuge for filamentous bacteria from nanoflagellate predation and (ii) for the investigated filamentous bacteria, prey-predator contact probability could be more influenced by factors other than the prey size.
公开日期	2012-03-06
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/2737]
专题	南京地理与湖泊研究所_湖泊室
推荐引用方式 GB/T 7714	Wu, QL,Boenigk, J,Hahn, MW. Successful predation of filamentous bacteria by a nanoflagellate challenges current models of flagellate bacterivory[J]. APPLIED AND ENVIRONMENTAL MICROBIOLOGY,2004,70(1):332-339.
APA	Wu, QL,Boenigk, J,&Hahn, MW.(2004).Successful predation of filamentous bacteria by a nanoflagellate challenges current models of flagellate bacterivory.APPLIED AND ENVIRONMENTAL MICROBIOLOGY,70(1),332-339.
MLA	Wu, QL,et al."Successful predation of filamentous bacteria by a nanoflagellate challenges current models of flagellate bacterivory".APPLIED AND ENVIRONMENTAL MICROBIOLOGY 70.1(2004):332-339.