DOI: 10.1111/gcb.13415
论文题名: Exposure to a heat wave under food limitation makes an agricultural insecticide lethal: a mechanistic laboratory experiment
作者: Dinh K.V. ; Janssens L. ; Stoks R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 10 起始页码: 3361
结束页码: 3372
语种: 英语
英文关键词: aquatic insects
; delayed effects of stressors
; ecological risk assessment
; immunosuppression
; multistressor studies
; starvation
; stress ecology
; synergism
; temperature extremes
Scopus关键词: damselfly
; experiment
; food limitation
; global change
; heat wave
; immune response
; insecticide
; metabolism
; risk assessment
; starvation
; sublethal effect
; synergism
; Animalia
; Coenagrion puella
; Hexapoda
; Zygoptera
英文摘要: Extreme temperatures and exposure to agricultural pesticides are becoming more frequent and intense under global change. Their combination may be especially problematic when animals suffer food limitation. We exposed Coenagrion puella damselfly larvae to a simulated heat wave combined with food limitation and subsequently to a widespread agricultural pesticide (chlorpyrifos) in an indoor laboratory experiment designed to obtain mechanistic insights in the direct effects of these stressors in isolation and when combined. The heat wave reduced immune function (activity of phenoloxidase, PO) and metabolic rate (activity of the electron transport system, ETS). Starvation had both immediate and delayed negative sublethal effects on growth rate and physiology (reductions in Hsp70 levels, total fat content, and activity levels of PO and ETS). Exposure to chlorpyrifos negatively affected all response variables. While the immediate effects of the heat wave were subtle, our results indicate the importance of delayed effects in shaping the total fitness impact of a heat wave when followed by pesticide exposure. Firstly, the combination of delayed negative effects of the heat wave and starvation, and the immediate negative effect of chlorpyrifos considerably (71%) reduced larval growth rate. Secondly and more strikingly, chlorpyrifos only caused considerable (ca. 48%) mortality in larvae that were previously exposed to the combination of the heat wave and starvation. This strong delayed synergism for mortality could be explained by the cumulative metabolic depression caused by each of these stressors. Further studies with increased realism are needed to evaluate the consequences of the here-identified delayed synergisms at the level of populations and communities. This is especially important as this synergism provides a novel explanation for the poorly understood potential of heat waves and of sublethal pesticide concentrations to cause mass mortality. © 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/61299
Appears in Collections: 影响、适应和脆弱性
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作者单位: Laboratory of Aquatic Ecology, Evolution and Conservation, University of Leuven, Charles Deberiotstraaat 32, Leuven, Belgium; National Institute of Aquatic Resources, Technical University of Denmark, Kavalergården 6, Charlottenlund, Denmark; Department of Freshwater Aquaculture, Institute of Aquaculture, Nha Trang University, No 2 Nguyen Dinh Chieu, Nha Trang, Viet Nam
Recommended Citation:
Dinh K.V.,Janssens L.,Stoks R.. Exposure to a heat wave under food limitation makes an agricultural insecticide lethal: a mechanistic laboratory experiment[J]. Global Change Biology,2016-01-01,22(10)