DOI: 10.1111/gcb.12970
论文题名: Mammalian herbivores confer resilience of Arctic shrub-dominated ecosystems to changing climate
作者: Kaarlejärvi E. ; Hoset K.S. ; Olofsson J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 9 起始页码: 3379
结束页码: 3388
语种: 英语
英文关键词: Alternative stable state
; Climate warming
; Grazer
; Lemmus
; Microtus
; Myodes
; Positive feedback
; Rangifer
; Regime shift
; Tundra vegetation
Scopus关键词: biomass
; climate change
; ecosystem resilience
; global warming
; herbivore
; mammal
; shrub
; tundra
; vegetation
; Arctic
; Lemmus
; Mammalia
; Microtus
; Rangifer
; animal
; Arctic
; biomass
; climate change
; Ericaceae
; food chain
; greenhouse effect
; herbivory
; lingonberry
; mammal
; Norway
; physiology
; tundra
; Animals
; Arctic Regions
; Biomass
; Climate Change
; Ericaceae
; Food Chain
; Global Warming
; Herbivory
; Mammals
; Norway
; Tundra
; Vaccinium vitis-idaea
英文摘要: Climate change is resulting in a rapid expansion of shrubs in the Arctic. This expansion has been shown to be reinforced by positive feedbacks, and it could thus set the ecosystem on a trajectory toward an alternate, more productive regime. Herbivores, on the other hand, are known to counteract the effects of simultaneous climate warming on shrub biomass. However, little is known about the impact of herbivores on resilience of these ecosystems, that is, the capacity of a system to absorb disturbance and still remain in the same regime, retaining the same function, structure, and feedbacks. Here, we investigated how herbivores affect resilience of shrub-dominated systems to warming by studying the change of shrub biomass after a cessation of long-term experimental warming in a forest-tundra ecotone. As predicted, warming increased the biomass of shrubs, and in the absence of herbivores, shrub biomass in tundra continued to increase 4 years after cessation of the artificial warming, indicating that positive effects of warming on plant growth may persist even over a subsequent colder period. Herbivores contributed to the resilience of these systems by returning them back to the original low-biomass regime in both forest and tundra habitats. These results support the prediction that higher shrub biomass triggers positive feedbacks on soil processes and microclimate, which enable maintaining the rapid shrub growth even in colder climates. Furthermore, the results show that in our system, herbivores facilitate the resilience of shrub-dominated ecosystems to climate warming. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61711
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Ecology and Environmental Sciences, University of Umeå, Umeå, Sweden; Section of Ecology, Department of Biology, University of Turku, Turku, Finland
Recommended Citation:
Kaarlejärvi E.,Hoset K.S.,Olofsson J.. Mammalian herbivores confer resilience of Arctic shrub-dominated ecosystems to changing climate[J]. Global Change Biology,2015-01-01,21(9)