DOI: 10.1111/gcb.13361
论文题名: Dry conditions disrupt terrestrial–aquatic linkages in northern catchments
作者: Szkokan-Emilson E.J. ; Kielstra B.W. ; Arnott S.E. ; Watmough S.A. ; Gunn J.M. ; Tanentzap A.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期: 1 起始页码: 117
结束页码: 126
语种: 英语
英文关键词: climate change
; dissolved organic carbon
; drought
; Hyalella azteca
; littoral invertebrates
; metal toxicity
; organic soils
; terrestrial organic matter
Scopus关键词: bioindicator
; catchment
; climate change
; climate effect
; dissolved organic carbon
; ecosystem response
; hydrological response
; invertebrate
; littoral environment
; metal
; organic matter
; organic soil
; Azteca
; Hyalella azteca
; Invertebrata
英文摘要: Aquatic ecosystems depend on terrestrial organic matter (tOM) to regulate many functions, such as food web production and water quality, but an increasing frequency and intensity of drought across northern ecosystems is threatening to disrupt this important connection. Dry conditions reduce tOM export and can also oxidize wetland soils and release stored contaminants into stream flow after rainfall. Here, we test whether these disruptions to terrestrial–aquatic linkages occur during mild summer drought and whether this affects biota across 43 littoral zone sites in 11 lakes. We use copper (Cu) and nickel (Ni) as representative contaminants, and measure abundances of Hyalella azteca, a widespread indicator of ecosystem condition and food web production. We found that tOM concentrations were reduced but correlations with organic soils (wetlands and riparian forests) persisted during mild drought and were sufficient to suppress labile Cu concentrations. Wetlands, however, also became a source of labile Ni to littoral zones, which was linked to reduced abundances of the amphipod H. azteca, on average by up to 70 times across the range of observed Ni concentrations. This reveals a duality in the functional linkage of organic soils to aquatic ecosystems whereby they can help buffer the effects of hydrologic disconnection between catchments and lakes but at the cost of biogeochemical changes that release stored contaminants. As evidence of the toxicity of trace contaminant concentrations and their global dispersion grows, sustaining links among forests, organic soils and aquatic ecosystems in a changing climate will become increasingly important. © 2016 The Authors. Global Change Biology Published by John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61159
Appears in Collections: 影响、适应和脆弱性
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作者单位: Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge, United Kingdom; Department of Biology, Queen's University, Kingston, ON, Canada; School of the Environment, Trent University, Peterborough, ON, Canada; Vale Living with Lakes Centre, Laurentian University, Sudbury, ON, Canada
Recommended Citation:
Szkokan-Emilson E.J.,Kielstra B.W.,Arnott S.E.,et al. Dry conditions disrupt terrestrial–aquatic linkages in northern catchments[J]. Global Change Biology,2017-01-01,23(1)