DOI: 10.1016/j.quascirev.2016.02.019
Scopus记录号: 2-s2.0-84958960352
论文题名: 20th century human pressures drive reductions in deepwater oxygen leading to losses of benthic methane-based food webs
作者: Belle S. ; Millet L. ; Verneaux V. ; Lami A. ; David E. ; Murgia L. ; Parent C. ; Musazzi S. ; Gauthier E. ; Bichet V. ; Magny M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 137 起始页码: 209
结束页码: 220
语种: 英语
英文关键词: Anthropogenic impact
; Benthic food web
; Biogenic methane
; Dead zones
; Global change
; Paleolimnology
; Trophic functioning
Scopus关键词: Ecology
; Effluents
; Gas emissions
; Global warming
; Greenhouse gases
; Lakes
; Land use
; Methane
; Paleolimnology
; Sewage
; Anthropogenic impacts
; Dead zones
; Food webs
; Global change
; Trophic functioning
; Organic carbon
; Chironomidae
; Diptera
; Hexapoda
英文摘要: Freshwater lakes play a key role in the global carbon cycle as sinks (organic carbon sequestration) and sources (greenhouse gas emissions). Understanding the carbon cycle response to environmental changes is becoming a crucial challenge in the context of global warming and the preponderance of human pressures. We reconstructed the long-term (1500 years) evolution of trophic functioning of the benthic food web, based on methanotrophic ancient DNA and chironomid isotope analyses). In addition, human land use is also reconstructed in three different lakes (eastern France, Jura Mountains). Our findings confirm that the benthic food web can be highly dependent on methane-derived carbon (up to 50% of the chironomid biomass) and reveal that the activation of this process can correspond to a natural functioning or be a consequence of anthropic perturbation. The studied lakes also showed a similar temporal evolution over the last century with the disappearance of the profundal aquatic insects (Chironomidae, Diptera), considered as keystone for the whole lake food web (e.g., coupling benthic-pelagic), inducing a potential collapse in the transfer of methane to top consumers. This functional state, also called the dead zone expansion, was caused by the change in human land-use occurring at the beginning of the 20th century. The strong modification of agro-pastoral practices (e.g., fertilization practices, intensive grazing, and sewage effluent) modified the influx of nutrients (by diffuse and/or point-source inputs) and induced a significant increase in the trophic status and organic matter sedimentation to reach unprecedented values. Further studies should be planned to assess dead zone expansion and, according to the regime shift theory, to provide environmental tipping points for sustainable resource management. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59648
Appears in Collections: 过去全球变化的重建
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作者单位: UMR CNRS 6249, Laboratoire de Chrono-Environnement, Université Bourgogne Franche-Comté, Besançon, France; CNR, Istituto per lo Studio degli Ecosistemi, Verbania Pallanza, Italy; UMR INRA 42, Centre Alpin de Recherche sur les Réseaux Trophiques des Ecosystèmes Limniques, Chambéry, France
Recommended Citation:
Belle S.,Millet L.,Verneaux V.,et al. 20th century human pressures drive reductions in deepwater oxygen leading to losses of benthic methane-based food webs[J]. Quaternary Science Reviews,2016-01-01,137