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  Bacterial Community Composition and Extracellular Enzyme Activity in Temperate Streambed Sediment during Drying and Rewetting

Pohlon, E., Ochoa Fandino, A., & Marxsen, J. (2013). Bacterial Community Composition and Extracellular Enzyme Activity in Temperate Streambed Sediment during Drying and Rewetting. PLoS One, 8(12):, pp. 1-14. doi:10.1371/journal.pone.0083365.

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資料種別: 学術論文

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 作成者:
Pohlon, Elisabeth1, 著者
Ochoa Fandino, Adriana1, 著者
Marxsen, Jürgen2, 著者           
所属:
1Department of Animal Ecology & Systematics, University of Giessen, Heinrich-Buff-Ring 26, 35392 Giessen, Germany, ou_persistent22              
2Limnological River Station Schlitz, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976546              

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キーワード: stream, climate change, sediment, desiccation, rewetting, bacterial community composition, extracellular enzymes, multifunctionality, Breitenbach
 要旨: Droughts are among the most important disturbance events for stream ecosystems; they not only affect stream hydrology but also the stream biota. Although desiccation of streams is common in Mediterranean regions, phases of dryness in headwaters have been observed more often and for longer periods in extended temperate regions, including Central Europe, reflecting global climate change and enhanced water withdrawal. The effects of desiccation and rewetting on the bacterial community composition and extracellular enzyme activity, a key process in the carbon flow of streams and rivers, were investigated in a typical Central European stream, the Breitenbach (Hesse, Germany). Wet streambed sediment is an important habitat in streams. It was sampled and exposed in the laboratory to different drying scenarios (fast, intermediate, slow) for 13 weeks, followed by rewetting of the sediment from the fast drying scenario via a sediment core perfusion technique for 2 weeks. Bacterial community structure was analyzed using CARD-FISH and TGGE, and extracellular enzyme activity was assessed using fluorogenic model substrates. During desiccation the bacterial community composition shifted toward composition in soil, exhibiting increasing proportions of Actinobacteria and Alphaproteobacteria and decreasing proportions of Bacteroidetes and Betaproteobacteria. Simultaneously the activities of extracellular enzymes decreased, most pronounced with aminopeptidases and less pronounced with enzymes involved in the degradation of polymeric carbohydrates. After rewetting, the general ecosystem functioning, with respect to extracellular enzyme activity, recovered after 10 to 14 days. However, the bacterial community composition had not yet achieved its original composition as in unaffected sediments within this time. Thus, whether the bacterial community eventually recovers completely after these events remains unknown. Perhaps this community undergoes permanent changes, especially after harsh desiccation, followed by loss of the specialized functions of specific groups of bacteria.

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言語: eng - English
 日付: 2013-07-222013-11-012013-12-27
 出版の状態: オンラインで出版済み
 ページ: 14
 出版情報: -
 目次: -
 査読: 査読あり
 識別子(DOI, ISBNなど): DOI: 10.1371/journal.pone.0083365
その他: 1130
 学位: -

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出版物 1

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出版物名: PLoS One
種別: 学術雑誌
 著者・編者:
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出版社, 出版地: San Francisco, CA : Public Library of Science
ページ: - 巻号: 8 (12) 通巻号: e83365 開始・終了ページ: 1 - 14 識別子(ISBN, ISSN, DOIなど): ISSN: 1932-6203
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000277850