DOI: 10.1111/gcb.12265
论文题名: Wetlands serve as natural sources for improvement of stream ecosystem health in regions affected by acid deposition
作者: Pound K.L. ; Lawrence G.B. ; Passy S.I.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 9 起始页码: 2720
结束页码: 2728
语种: 英语
英文关键词: Acidification
; Aluminum
; Biodiversity
; Biofilm
; Brownification
; Diatoms
; Ecological guilds
; Stream restoration
; Wetlands
Scopus关键词: acid
; aluminum
; acid deposition
; acidification
; aluminum
; biodiversity
; biofilm
; climate change
; diatom
; ecosystem health
; ecosystem management
; restoration ecology
; stream
; trophic level
; wetland
; acidification
; article
; biodiversity
; biofilm
; brownification
; diatom
; ecological guilds
; ecosystem
; environmental health
; stream restoration
; wetland
; acidification
; aluminum
; biodiversity
; biofilm
; brownification
; diatoms
; ecological guilds
; stream restoration
; wetlands
; Acids
; Ecosystem
; Environmental Health
; Wetlands
; Adirondack Mountains
; New York [United States]
; United States
; Bacillariophyta
英文摘要: For over 40 years, acid deposition has been recognized as a serious international environmental problem, but efforts to restore acidified streams and biota have had limited success. The need to better understand the effects of different sources of acidity on streams has become more pressing with the recent increases in surface water organic acids, or 'brownification,' associated with climate change and decreased inorganic acid deposition. Here, we carried out a large scale multi-seasonal investigation in the Adirondacks, one of the most acid-impacted regions in the United States, to assess how acid stream producers respond to local and watershed influences and whether these influences can be used in acidification remediation. We explored the pathways of wetland control on aluminum chemistry and diatom taxonomic and functional composition. We demonstrate that streams with larger watershed wetlands have higher organic content, lower concentrations of acidic anions, and lower ratios of inorganic to organic monomeric aluminum, all beneficial for diatom biodiversity and guilds producing high biomass. Although brownification has been viewed as a form of pollution, our results indicate that it may be a stimulating force for biofilm producers with potentially positive consequences for higher trophic levels. Our research also reveals that the mechanism of watershed control of local stream diatom biodiversity through wetland export of organic matter is universal in running waters, operating not only in hard streams, as previously reported, but also in acid streams. Our findings that the negative impacts of acid deposition on Adirondack stream chemistry and biota can be mitigated by wetlands have important implications for biodiversity conservation and stream ecosystem management. Future acidification research should focus on the potential for wetlands to improve stream ecosystem health in acid-impacted regions and their direct use in stream restoration, for example, through stream rechanneling or wetland construction in appropriate hydrologic settings. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62350
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, University of Texas at Arlington, Box 19498, Arlington, TX 76019-0498, United States; New York Water Science Center, US Geological Survey, 425 Jordan Rd, Troy, NY 12180, United States
Recommended Citation:
Pound K.L.,Lawrence G.B.,Passy S.I.. Wetlands serve as natural sources for improvement of stream ecosystem health in regions affected by acid deposition[J]. Global Change Biology,2013-01-01,19(9)