DOI: 10.1111/gcb.13696
论文题名: Biotic interactions modify multiple-stressor effects on juvenile brown trout in an experimental stream food web
作者: Bruder A. ; Salis R.K. ; Jones P.E. ; Matthaei C.D.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期: 9 起始页码: 3882
结束页码: 3894
语种: 英语
英文关键词: agricultural stressors
; flow velocity
; freshwater fish
; invertebrate prey
; nitrification inhibitor
; nutrient enrichment
; stressor interactions
; water temperature
Scopus关键词: Invertebrata
; Salmo trutta
; Salmonidae
英文摘要: Agricultural land use results in multiple stressors affecting stream ecosystems. Flow reduction due to water abstraction, elevated levels of nutrients and chemical contaminants are common agricultural stressors worldwide. Concurrently, stream ecosystems are also increasingly affected by climate change. Interactions among multiple co-occurring stressors result in biological responses that cannot be predicted from single-stressor effects (i.e. synergisms and antagonisms). At the ecosystem level, multiple-stressor effects can be further modified by biotic interactions (e.g. trophic interactions). We conducted a field experiment using 128 flow-through stream mesocosms to examine the individual and combined effects of water abstraction, nutrient enrichment and elevated levels of the nitrification inhibitor dicyandiamide (DCD) on survival, condition and gut content of juvenile brown trout and on benthic abundance of their invertebrate prey. Flow velocity reduction decreased fish survival (−12% compared to controls) and condition (−8% compared to initial condition), whereas effects of nutrient and DCD additions and interactions among these stressors were not significant. Negative effects of flow velocity reduction on fish survival and condition were consistent with effects on fish gut content (−25% compared to controls) and abundance of dominant invertebrate prey (−30% compared to controls), suggesting a negative metabolic balance driving fish mortality and condition decline, which was confirmed by structural equation modelling. Fish mortality under reduced flow velocity increased as maximal daily water temperatures approached the upper limit of their tolerance range, reflecting synergistic interactions between these stressors. Our study highlights the importance of indirect stressor effects such as those transferred through trophic interactions, which need to be considered when assessing and managing fish populations and stream food webs in multiple-stressor situations. However, in real streams, compensatory mechanisms and behavioural responses, as well as seasonal and spatial variation, may alter the intensity of stressor effects and the sensitivity of trout populations. © 2017 John Wiley & Sons Ltd 资助项目: We greatly acknowledge the help of M. Ward, R. Dean, K. Lange, R. Zellmer and A. Wagenhoff in the field and/or laboratory. We also much appreciate the support by N. McHugh and C. and J. Douglas and discussions with K. Lange, G. Closs, R. Knudsen, J. Augspurger and A. Frainer. The study was funded by the New Zealand Ministry for Primary Industries (SLMACC grant 30616) and University of Otago PhD scholarships to R. K. Salis and P. E. Jones. We are also grateful for the constructive comments by two anonymous reviewers and the Subject Editor.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60830
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Zoology, University of Otago, Dunedin, New Zealand
Recommended Citation:
Bruder A.,Salis R.K.,Jones P.E.,et al. Biotic interactions modify multiple-stressor effects on juvenile brown trout in an experimental stream food web[J]. Global Change Biology,2017-01-01,23(9)