DOI: 10.1111/gcb.14117
Scopus记录号: 2-s2.0-85045398289
论文题名: Persistent nitrogen limitation of stream biofilm communities along climate gradients in the Arctic
作者: Myrstener M. ; Rocher-Ros G. ; Burrows R.M. ; Bergström A.-K. ; Giesler R. ; Sponseller R.A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 8 起始页码: 3680
结束页码: 3691
语种: 英语
英文关键词: Arctic
; bioassay
; biofilm
; climate change
; colimitation
; nitrogen limitation
; nutrient addition
; stream productivity
Scopus关键词: arctic environment
; bioassay
; biofilm
; chlorophyll a
; climate change
; community response
; freshwater ecosystem
; nitrogen
; nutrient enrichment
; primary production
; respiration
; stream
; third sector
; Arctic
英文摘要: Climate change is rapidly reshaping Arctic landscapes through shifts in vegetation cover and productivity, soil resource mobilization, and hydrological regimes. The implications of these changes for stream ecosystems and food webs is unclear and will depend largely on microbial biofilm responses to concurrent shifts in temperature, light, and resource supply from land. To study those responses, we used nutrient diffusing substrates to manipulate resource supply to biofilm communities along regional gradients in stream temperature, riparian shading, and dissolved organic carbon (DOC) loading in Arctic Sweden. We found strong nitrogen (N) limitation across this gradient for gross primary production, community respiration and chlorophyll-a accumulation. For unamended biofilms, activity and biomass accrual were not closely related to any single physical or chemical driver across this region. However, the magnitude of biofilm response to N addition was: in tundra streams, biofilm response was constrained by thermal regimes, whereas variation in light availability regulated this response in birch and coniferous forest streams. Furthermore, heterotrophic responses to experimental N addition increased across the region with greater stream water concentrations of DOC relative to inorganic N. Thus, future shifts in resource supply to these ecosystems are likely to interact with other concurrent environmental changes to regulate stream productivity. Indeed, our results suggest that in the absence of increased nutrient inputs, Arctic streams will be less sensitive to future changes in other habitat variables such as temperature and DOC loading. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110284
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Climate Impacts Research Centre, Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden; Australian Rivers Institute, Griffith University, Brisbane, Qld, Australia
Recommended Citation:
Myrstener M.,Rocher-Ros G.,Burrows R.M.,et al. Persistent nitrogen limitation of stream biofilm communities along climate gradients in the Arctic[J]. Global Change Biology,2018-01-01,24(8)