期刊
EUROPEAN JOURNAL OF PROTISTOLOGY
卷 49, 期 2, 页码 255-271出版社
ELSEVIER GMBH
DOI: 10.1016/j.ejop.2012.08.001
关键词
Acid mining lakes; Growth rates; pH response; Oxytricha; SSU rDNA; Urosomoida
类别
资金
- Austrian Science Fund FWF [P20118-B17, P23415-B17]
- Austrian Science Fund (FWF) [P23415, P20118] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 23415] Funding Source: researchfish
We investigated the morphology, phylogeny of the 18S rDNA, and pH response of Oxytricha acidotolerans sp. nov. and Urosomoida sp. (Ciliophora, Hypotricha) isolated from two chemically similar acid mining lakes (pH similar to 2.6) located at Langau, Austria, and in Lusatia, Germany. Oxytricha acidotolerans sp. nov. from Langau has 18 frontal-ventral-transverse cirri but a very indistinct kinety 3 fragmentation so that the assignment to Oxytricha is uncertain. The somewhat smaller species from Lusatia has a highly variable cirral pattern and the dorsal kineties arranged in the Urosomoida pattern and is, therefore, preliminary designated as Urosomoida sp. The pH response was measured as ciliate growth rates in laboratory experiments at pH ranging from 2.5 to 7.0. Our hypothesis was that the shape of the pH reaction norm would not differ between these closely related (3% difference in their SSU rDNA) species. Results revealed a broad pH niche for O. acidotolerans, with growth rates peaking at moderately acidic conditions (pH 5.2). Cyst formation was positively and linearly related to pH. Urosomoida sp. was more sensitive to pH and did not survive at circumneutral pH. Accordingly, we reject our hypothesis that similar habitats would harbour ciliate species with virtually identical pH reaction norm. (C) 2012 Elsevier GmbH. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据