DOI: 10.1111/gcb.12516
论文题名: Trophic-level dependent effects on CO2 emissions from experimental stream ecosystems
作者: Atwood T.B. ; Hammill E. ; Richardson J.S.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 11 起始页码: 3386
结束页码: 3396
语种: 英语
英文关键词: Biodiversity
; Carbon efflux
; Ecosystem function
; Food web
; Trophic cascades
; Trophic level
Scopus关键词: carbon dioxide
; chlorophyll
; chlorophyll a
; animal
; Anura
; biodiversity
; biomass
; British Columbia
; environmental monitoring
; food chain
; insect
; invertebrate
; metabolism
; physiology
; river
; Animals
; Anura
; Biodiversity
; Biomass
; British Columbia
; Carbon Dioxide
; Chlorophyll
; Environmental Monitoring
; Food Chain
; Insects
; Invertebrates
; Rivers
英文摘要: Concern over accelerating rates of species invasions and losses have initiated investigations into how local and global changes to predator abundance mediate trophic cascades that influence CO2 fluxes of aquatic ecosystems. However, to date, no studies have investigated how species additions or losses at other consumer trophic levels influence the CO2 flux of aquatic ecosystems. In this study, we added a large predatory stonefly, detritivorous stonefly, or grazer tadpole to experimental stream food webs and over a 70-day period quantified their effects on community composition, leaf litter decomposition, chlorophyll-a concentrations, and stream CO2 emissions. In general, streams where the large grazer or large detritivore were added showed no change in total invertebrate biomass, leaf litter loss, chlorophyll-a concentrations, or stream CO2 emissions compared with controls; although we did observe a spike in CO2 emissions in the large grazer treatment following a substantial reduction in chlorophyll-a concentrations on day 28. However, the large grazer and large detritivore altered the community composition of streams by reducing the densities of other grazer and detritivore taxa, respectively, compared with controls. Conversely, the addition of the large predator created trophic cascades that reduced total invertebrate biomass and increased primary producer biomass. The cascading effects of the predator additions on the food web ultimately led to decreased CO2 emissions from stream channels by up to 95%. Our results suggest that stream ecosystem processes were more influenced by changes in large predator abundance than large grazer or detritivore abundance, because of a lack of functionally similar large predators. Our study demonstrates that the presence/absence of species with unique functional roles may have consequences for the exchange of CO2 between the ecosystem and the atmosphere. © 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/62173
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, BC, Canada; Global Change Institute, University of Queensland, Brisbane, QLD, Australia; Department of Zoology, University of British Columbia, Vancouver, BC, Canada; School of the Environment, University of Technology Sydney, Ultimo, NSW, Australia
Recommended Citation:
Atwood T.B.,Hammill E.,Richardson J.S.. Trophic-level dependent effects on CO2 emissions from experimental stream ecosystems[J]. Global Change Biology,2014-01-01,20(11)