DOI: 10.1111/gcb.12484
论文题名: Missing effects of anthropogenic nutrient deposition on sentinel alpine ecosystems
作者: Vinebrooke R.D. ; Maclennan M.M. ; Bartrons M. ; Zettel J.P.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 7 起始页码: 2173
结束页码: 2182
语种: 英语
英文关键词: Alpine ponds
; Benthic-pelagic coupling
; Competition
; Extreme environments
; Fairy shrimp
; Grazing pressure
; Nitrogen deposition
; Nutrient co-limitation
Scopus关键词: alpine environment
; anthropogenic source
; atmospheric deposition
; bioassay
; competition (ecology)
; ecological impact
; ecosystem response
; extreme event
; global change
; grazing pressure
; nitrogen
; nutrient dynamics
; nutrient enrichment
; phytoplankton
; ammonium nitrate
; nitric acid derivative
; nitrogen
; phosphorus
; altitude
; Canada
; chemistry
; metabolism
; phytoplankton
; pond
; tundra
; Alberta
; Altitude
; Nitrates
; Nitrogen
; Phosphorus
; Phytoplankton
; Ponds
; Tundra
英文摘要: Anthropogenic nitrogen (N) deposition affects unproductive remote alpine and circumpolar ecosystems, which are often considered sentinels of global change. Human activities and forest fires can also elevate phosphorus (P) deposition, possibly compounding the ecological effects of increased N deposition given the ubiquity of nutrient co-limitation of primary producers. Low N : P ratios coupled with evidence of NP-limitation from bioassays led us to hypothesize that P indirectly stimulates phytoplankton by amplifying the direct positive effect of N (i.e. serial N-limitation) in alpine ponds. We tested the hypothesis using the first replicated N × P enrichment experiment conducted at the whole-ecosystem level, which involved 12 alpine ponds located in the low N deposition backcountry of the eastern Front Range of the Canadian Rockies. Although applications of N and P elevated ambient N and P concentrations by 2-5×, seston and plankton remained relatively unaffected in the amended ponds. However, additions of ammonium nitrate elevated the δ15N signals of both primary producers and herbivores (fairy shrimp; Anostraca), attesting to trophic transfer of N deposition to consumers. Further, in situ bioassays revealed that grazing by high ambient densities of fairy shrimp together with potential competition from algae lining the pond bottoms suppressed the otherwise serially N-limited response by phytoplankton. Our findings highlight how indirect effects of biotic interactions rather the often implicit direct effects of chemical changes can regulate the sensitivities of extreme ecosystems to nutrient deposition. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62051
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biological Sciences, University of Alberta, Edmonton, AB, T6G 2E9, Canada; Department of Environmental Sciences and Food, University of Victoria, Barcelona, Spain; Center for Limnology, University of Wisconsin-Madison, Madison, 53706, United States
Recommended Citation:
Vinebrooke R.D.,Maclennan M.M.,Bartrons M.,et al. Missing effects of anthropogenic nutrient deposition on sentinel alpine ecosystems[J]. Global Change Biology,2014-01-01,20(7)