DOI: 10.1002/2014GB004932
Scopus记录号: 2-s2.0-84920987248
论文题名: Inherited hypoxia: A new challenge for reoligotrophicated lakes under global warming
作者: Jenny J ; -P ; , Arnaud F ; , Alric B ; , Dorioz J ; -M ; , Sabatier P ; , Meybeck M ; , Perga M ; -E
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 12 起始页码: 1413
结束页码: 1423
语种: 英语
英文关键词: Anthropocene
; climate change
; eutrophication
; hypoxia
; lakes
; varved sediments
Scopus关键词: anthropology
; climate variation
; ecosystem function
; ecosystem service
; eutrophication
; global warming
; hypoxia
; lake pollution
; oligotrophic environment
; twentieth century
; Annecy
; France
; Haute Savoie
; Rhone-Alpes
英文摘要: The Anthropocene is characterized by a worldwide spread of hypoxia, among other manifestations, which threatens aquatic ecosystem functions, services, and biodiversity. The primary cause of hypoxia onset in recent decades is human-triggered eutrophication. Global warming has also been demonstrated to contribute to the increase of hypoxic conditions. However, the precise role of both environmental forcings on hypoxia dynamics over the long term remains mainly unknown due to a lack of historical monitoring. In this study, we used an innovative paleolimnological approach on three large European lakes to quantify past hypoxia dynamics and to hierarchies the contributions of climate and nutrients. Even for lake ecosystems that have been well oxygenated over a millennia-long period, and regardless of past climatic fluctuations, a shift to hypoxic conditions occurred in the 1950s in response to an unprecedented rise in total phosphorus concentrations above 10±5μg P L-1. Following this shift, hypoxia never disappeared despite the fact that environmental policies succeeded in drastically reducing lake phosphorus concentrations. During that period, decadal fluctuations in hypoxic volume were great, ranging between 0.5 and 8% of the total lake volumes. We demonstrate, through statistical modeling, that these fluctuations were essentially driven by climatic factors, such as river discharge and air temperature. In lakes Geneva and Bourget, which are fed by large river systems, fluctuations in hypoxic volume were negatively correlated with river discharge. In contrast, the expansion of hypoxia has been related only to warmer air temperatures at Annecy, which is fed by small river systems. Hence, we outline a theoretical framework assuming that restored lake ecosystems have inherited hypoxia from the eutrophication period and have shifted to a new stable state with new key controls of water and ecosystem quality. We suggest that controlling river discharge may be a complementary strategy for local management of lakes fed by large river systems. Key Points Factors driving hypoxia are assessed over the Holocene and the last 130 yearsHypoxia in the twentieth century has been triggered by anthropogenic P suppliesThe current dynamics of anthropogenic hypoxia has been driven by climate ©2014. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77505
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Centre Eau Terre Environnement, Institut National de la Recherche Scientifique, Quebec City, QC, Canada; Environnements Dynamiques Territoires de Montagne, Université de Savoie-Mont Blanc, CNRS, Le Bourget du Lac, France; INRA, UMR 042 Centre Alpin de Recherche sur les Réseaux Trophiques des Ecosystèmes Limniques, Université de Savoie-Mont Blanc, Thonon-les-bains, France; Institut Méditerranéen de Biodiversité et d'Ecologie Marine et Continentale, CNRS/IRD, Université d'Avignon, Marseille, France; Structure et Fonctionnement des Systèmes Hydriques Continentaux, Université de Paris 6, CNRS, Paris, France
Recommended Citation:
Jenny J,-P,, Arnaud F,et al. Inherited hypoxia: A new challenge for reoligotrophicated lakes under global warming[J]. Global Biogeochemical Cycles,2014-01-01,28(12)