DOI: 10.1111/gcb.13581
论文题名: Impaired ecosystem process despite little effects on populations: modeling combined effects of warming and toxicants
作者: Galic N. ; Grimm V. ; Forbes V.E.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期: 8 起始页码: 2973
结束页码: 2989
语种: 英语
英文关键词: dynamic energy budgets
; ecosystem services
; freshwater ecosystems
; individual-based model
; leaf litter processing
; multiple stressors
; population dynamics
Scopus关键词: Gammarus pseudolimnaeus
英文摘要: Freshwater ecosystems are exposed to many stressors, including toxic chemicals and global warming, which can impair, separately or in combination, important processes in organisms and hence higher levels of organization. Investigating combined effects of warming and toxicants has been a topic of little research, but neglecting their combined effects may seriously misguide management efforts. To explore how toxic chemicals and warming, alone and in combination, propagate across levels of biological organization, including a key ecosystem process, we developed an individual-based model (IBM) of a freshwater amphipod detritivore, Gammarus pseudolimnaeus, feeding on leaf litter. In this IBM, life history emerges from the individuals’ energy budgets. We quantified, in different warming scenarios (+1–+4 °C), the effects of hypothetical toxicants on suborganismal processes, including feeding, somatic and maturity maintenance, growth, and reproduction. Warming reduced mean adult body sizes and population abundance and biomass, but only in the warmest scenarios. Leaf litter processing, a key contributor to ecosystem functioning and service delivery in streams, was consistently enhanced by warming, through strengthened interaction between the detritivorous consumer and its resource. Toxicant effects on feeding and maintenance resulted in initially small adverse effects on consumers, but ultimately led to population extinction and loss of ecosystem process. Warming in combination with toxicants had little effect at the individual and population levels, but ecosystem process was impaired in the warmer scenarios. Our results suggest that exposure to the same amount of toxicants can disproportionately compromise ecosystem processing depending on global warming scenarios; for example, reducing organismal feeding rates by 50% will reduce resource processing by 50% in current temperature conditions, but by up to 200% with warming of 4 °C. Our study has implications for assessing and monitoring impacts of chemicals on ecosystems facing global warming. We advise complementing existing monitoring approaches with directly quantifying ecosystem processes and services. © 2017 John Wiley & Sons Ltd 资助项目: Galic, N.
; School of Biological Sciences, University of Nebraska-LincolnUnited States
; 电子邮件: ngalic@umn.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60874
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, NE, United States; Department of Ecology, Evolution and Behavior, University of Minnesota, 140 Gortner Laboratory, 1479 Gortner Avenue, St. Paul, MN, United States; Department of Ecological Modelling, Helmholtz Centre for Environmental Research—UFZ, Permoserstr. 15, Leipzig, Germany; German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, Leipzig, Germany
Recommended Citation:
Galic N.,Grimm V.,Forbes V.E.. Impaired ecosystem process despite little effects on populations: modeling combined effects of warming and toxicants[J]. Global Change Biology,2017-01-01,23(8)