DOI: 10.1007/s10533-017-0334-9
Scopus记录号: 2-s2.0-85018475936
论文题名: Warming and organic matter sources impact the proportion of dissolved to total activities in marine extracellular enzymatic rates
作者: Baltar F. ; Morán X.A.G. ; Lønborg C.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 133, 期: 3 起始页码: 307
结束页码: 316
语种: 英语
英文关键词: Dissolved enzymes
; Extracellular enzymatic activity
; Organic matter
; Warming
Scopus关键词: biodegradation
; coastal zone
; dissolved organic matter
; enzyme activity
; hydrolysis
; marine environment
; microbial activity
; warming
; Australia
; Coral Sea
; Great Barrier Reef
; Queensland
; Bacteria (microorganisms)
英文摘要: Extracellular enzymatic activities (EEAs) are the rate-limiting step in the degradation of organic matter. Extracellular enzymes can be found associated to cells or dissolved in the surrounding water. The proportion of cell-free EEA constitutes in many marine environments more than half of the total activity. This high proportion causes an uncoupling between hydrolysis rates and the actual bacterial activity. However, we do not know what factors control the proportion of dissolved relative to total EEA, nor how this may change in the future ocean. To resolve this, we performed laboratory experiments with water from the Great Barrier Reef (Australia) to study the effects of temperature and dissolved organic matter sources on EEA and the proportion of dissolved EEA. We found that warming increases the rates of organic matter hydrolysis and reduces the proportion of dissolved relative to total EEA. This suggests a potential increase of the coupling between organic matter hydrolysis and heterotrophic activities with increasing ocean temperatures, although strongly dependent on the organic matter substrates available. Our study suggests that local differences in the organic matter composition in tropical coastal ecosystems will strongly affect the proportion of dissolved EEA in response to ocean warming. © 2017, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83276
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Marine Science, University of Otago, PO Box 56, Dunedin, New Zealand; NIWA/University of Otago Research Centre for Oceanography, PO Box 56, Dunedin, New Zealand; Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia; Australian Institute of Marine Science, PMB No 3, Townsville, QLD, Australia
Recommended Citation:
Baltar F.,Morán X.A.G.,Lønborg C.. Warming and organic matter sources impact the proportion of dissolved to total activities in marine extracellular enzymatic rates[J]. Biogeochemistry,2017-01-01,133(3)