DOI: 10.1111/gcb.13664
论文题名: Warmer night-time temperature promotes microbial heterotrophic activity and modifies stream sediment community
作者: Freixa A. ; Acuña V. ; Casellas M. ; Pecheva S. ; Romaní A.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期: 9 起始页码: 3825
结束页码: 3837
语种: 英语
英文关键词: artificial streams
; diel cycles
; dissolved organic carbon
; extracellular enzyme activities
; global warming
; meiofauna
Scopus关键词: algae
; Bacteria (microorganisms)
; Ciliophora
; Copepoda
; Nematoda
; Turbellaria
英文摘要: Diel temperature patterns are changing because of global warming, with higher temperatures being predicted to be more pronounced at night. Biological reactions are temperature dependent, with some occurring only during the daylight hours (e.g., light photosynthesis) and other during the entire day (e.g., respiration). Consequently, we expect the modification of daily temperature cycles to alter microbial biological reactions in stream sediments. Here, we aimed to study the effect of warming and changes of the diel temperature patterns on stream sediment biofilm functions tied to organic carbon decomposition, as well as on biofilm meiofaunal community structure. We performed an eight-week experiment with 12 artificial streams subjected to three different diel temperature patterns: warming, warmer nights and control. Significant effects of warming on biofilm function and structure were mainly detected in the long term. Our results showed that warming altered biofilm function, especially in the warmer nights’ treatment, which enhanced β-glucosidase enzyme activity. Interestingly, clear opposite diel patterns were observed for dissolved organic carbon and β-glucosidase activity, suggesting that, at night, sediment bacteria quickly consume the input of photosynthetic dissolved organic carbon labile compounds created during light-time. The biofilm structure was also altered by warming, as both warming and warmer night treatments enhanced copepod abundance and diminished abundances of turbellaria and nematodes, which, in turn, controlled bacterial, algal and ciliate communities. Overall, we conclude that warming has strong effect on sediment biofilm structure and enhanced microbial organic matter degradation which might, consequently, affect higher trophic levels and river carbon cycling. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60827
Appears in Collections: 影响、适应和脆弱性
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作者单位: Institute of Aquatic Ecology, University of Girona, Girona, Spain; Catalan Institute for Water Research (ICRA), Girona, Spain; Faculty of Biology, Sofia University, Sofia, Bulgaria
Recommended Citation:
Freixa A.,Acuña V.,Casellas M.,et al. Warmer night-time temperature promotes microbial heterotrophic activity and modifies stream sediment community[J]. Global Change Biology,2017-01-01,23(9)