| DOI: | 10.1111/gcb.12103
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| 论文题名: | Long-term amelioration of acidity accelerates decomposition in headwater streams |
| 作者: | Jenkins G.B.; Woodward G.; Hildrew A.G.
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| 刊名: | Global Change Biology
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| ISSN: | 13541013
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| 出版年: | 2013
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| 卷: | 19, 期:4 | | 起始页码: | 1100
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| 结束页码: | 1106
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| 语种: | 英语
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| 英文关键词: | Acidification
; Climate change
; Decomposition
; Ecosystem processes
; Long-term data
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| Scopus关键词: | acid
; acidification
; acidity
; anthropogenic effect
; bioassay
; climate change
; decomposition
; detritivory
; dominance
; food chain
; generalist
; headwater
; invertebrate
; seasonal variation
; secondary production
; article
; bioremediation
; pH
; river
; United Kingdom
; Acids
; Biodegradation, Environmental
; England
; Hydrogen-Ion Concentration
; Rivers
; Ashdown Forest
; East Sussex
; England
; United Kingdom
; Invertebrata
; Loeseliastrum
|
| 英文摘要: | The secondary production of culturally acidified streams is low, with a few species of generalist detritivores dominating invertebrate assemblages, while decomposition processes are impaired. In a series of lowland headwater streams in southern England, we measured the rate of cellulolytic decomposition and compared it with values measured three decades ago, when anthropogenic acidification was at its peak. We hypothesized that, if acidity has indeed ameliorated, the rate of decomposition will have accelerated, thus potentially supporting greater secondary production and the longer food chains that have been observed in some well-studied recovering freshwater systems. We used cellulose Shirley test cloth as a standardized bioassay to measure the rate of cellulolytic decomposition, via loss in tensile strength, for 31 streams in the Ashdown Forest over 7 days in summer 2011 and 49 days in winter 2012. We compared this with data from an otherwise identical study conducted in 1978 and 1979. In a secondary study, we determined whether decomposition followed a linear or logarithmic decay and, as Shirley cloth is no longer available, we tested an alternative in the form of readily available calico. Overall mean pH had increased markedly over the 32 years between the studies (from 6.0 to 6.7). In both the previous and contemporary studies, the relationship between decomposition and pH was strongest in winter, when pH reaches a seasonal minimum. As in the late 1970s, there was no relationship in 2011/2012 between pH and decay rate in summer. As postulated, decomposition in winter was significantly faster in 2011/2012 than in 1978/1979, with an average increase in decay rate of 18.1%. Recovery from acidification, due to decreased acidifying emissions and deposition, has led to an increase in the rate of cellulolytic decomposition. This response in a critical ecosystem process offers a potential explanation of one aspect of the limited biological recovery that has been observed so far, an increase in larger bodied predators including fish, which in turn leads to an increase in the length of food chains. © 2012 Blackwell Publishing Ltd. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/62474
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| Appears in Collections: | 影响、适应和脆弱性
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作者单位: | School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom
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| Recommended Citation: | |
Jenkins G.B.,Woodward G.,Hildrew A.G.. Long-term amelioration of acidity accelerates decomposition in headwater streams[J]. Global Change Biology,2013-01-01,19(4)
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