DOI: 10.1111/gcb.13225
论文题名: Permafrost thaw and intense thermokarst activity decreases abundance of stream benthic macroinvertebrates
作者: Chin K.S. ; Lento J. ; Culp J.M. ; Lacelle D. ; Kokelj S.V.
刊名: Global change biology
ISSN: 13652486
出版年: 2016
卷: 22, 期: 8 起始页码: 2715
结束页码: 2728
语种: 英语
英文关键词: arctic streams
; benthic macroinvertebrate
; permafrost degradation
; sedimentation
; thaw slump
; thermokarst
; total suspended solids
Scopus关键词: abundance
; benthos
; environmental disturbance
; macroinvertebrate
; permafrost
; population decline
; sedimentation
; stream
; thawing
; thermokarst
; animal
; Arctic
; Canada
; climate change
; ecosystem
; growth, development and aging
; invertebrate
; Northwest Territories
; permafrost
; river
; Animals
; Arctic Regions
; Canada
; Climate Change
; Ecosystem
; Invertebrates
; Northwest Territories
; Permafrost
; Rivers
; Canada
; Northwest Territories
; Invertebrata
英文摘要: Intensification of permafrost thaw has increased the frequency and magnitude of large permafrost slope disturbances (mega slumps) in glaciated terrain of northwestern Canada. Individual thermokarst disturbances up to 40 ha in area have made large volumes of previously frozen sediments available for leaching and transport to adjacent streams, significantly increasing sediment and solute loads in these systems. To test the effects of this climate-sensitive disturbance regime on the ecology of Arctic streams, we explored the relationship between physical and chemical variables and benthic macroinvertebrate communities in disturbed and undisturbed stream reaches in the Peel Plateau, Northwest Territories, Canada. Highly disturbed and undisturbed stream reaches differed with respect to taxonomic composition and invertebrate abundance. Minimally disturbed reaches were not differentiated by these variables but rather were distributed along a disturbance gradient between highly disturbed and undisturbed sites. In particular, there was evidence of a strong negative relationship between macroinvertebrate abundance and total suspended solids, and a positive relationship between abundance and the distance from the disturbance. Increases in both sediments and nutrients appear to be the proximate cause of community differences in highly disturbed streams. Declines in macroinvertebrate abundance in response to slump activity have implications for the food webs of these systems, potentially leading to negative impacts on higher trophic levels, such as fish. Furthermore, the disturbance impacts on stream health can be expected to intensify as climate change increases the frequency and magnitude of thermokarst. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61330
Appears in Collections: 影响、适应和脆弱性
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作者单位: Cumulative Impact Monitoring Program, Government of the Northwest Territories, Box 1320, Yellowknife, NT, X1A 2L9, Canada; Canadian Rivers Institute and Department of Biology, University of New Brunswick, 10 Bailey Drive, PO Box 4400, Fredericton, NB, E3B 5A3, Canada; Environment and Climate Change Canada, Canadian Rivers Institute and Department of Biology, University of New Brunswick, 10 Bailey Drive, PO Box 4400, Fredericton, NB, E3B 5A3, Canada; Department of Geography, University of Ottawa, Ottawa, ON, K1N 6N5, Canada; Northwest Territories Geological Survey, Government of the Northwest Territories, Box 1320, Yellowknife, NT, X1A 2L9, Canada
Recommended Citation:
Chin K.S.,Lento J.,Culp J.M.,et al. Permafrost thaw and intense thermokarst activity decreases abundance of stream benthic macroinvertebrates[J]. Global change biology,2016-01-01,22(8)