DOI: 10.1038/ngeo1734
论文题名: Predator-induced reduction of freshwater carbon dioxide emissions
作者: Atwood T.B. ; Hammill E. ; Greig H.S. ; Kratina P. ; Shurin J.B. ; Srivastava D.S. ; Richardson J.S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 3 起始页码: 191
结束页码: 194
语种: 英语
Scopus关键词: biomass
; carbon dioxide
; decomposition
; emission
; fish
; flux measurement
; food chain
; freshwater environment
; invertebrate
; monitoring
; pond
; predator-prey interaction
; primary production
; Canada
; Costa Rica
; algae
; Gasterosteus aculeatus
; Hesperoperla pacifica
; Invertebrata
; Mecistogaster modesta
英文摘要: Predators can influence the exchange of carbon dioxide between ecosystems and the atmosphere by altering ecosystem processes such as decomposition and primary production, according to food web theory1,2. Empirical knowledge of such an effect in freshwater systems is limited, but it has been suggested that predators in odd-numbered food chains suppress freshwater carbon dioxide emissions, and predators in even-numbered food chains enhance emissions2,3. Here, we report experiments in three-tier food chains in experimental ponds, streams and bromeliads in Canada and Costa Rica in the presence or absence of fish (Gasterosteus aculeatus) and invertebrate (Hesperoperla pacifica and Mecistogaster modesta) predators. We monitored carbon dioxide fluxes along with prey and primary producer biomass. We found substantially reduced carbon dioxide emissions in the presence of predators in all systems, despite differences in predator type, hydrology, climatic region, ecological zone and level of in situ primary production. We also observed lower amounts of prey biomass and higher amounts of algal and detrital biomass in the presence of predators. We conclude that predators have the potential to markedly influence carbon dioxide dynamics in freshwater systems. Copyright © 2013 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106838
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; Department of Zoology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; School of Biological Sciences, University of Canterbury, Christchurch 8041, New Zealand; Watershed Sciences Center, University of California-Davis, Davis, CA 95616, United States; Section of Ecology, Behavior and Evolution, University of California, San Diego, CA 92093, United States
Recommended Citation:
Atwood T.B.,Hammill E.,Greig H.S.,et al. Predator-induced reduction of freshwater carbon dioxide emissions[J]. Nature Geoscience,2013-01-01,6(3)