DOI: 10.1111/gcb.14521
Scopus记录号: 2-s2.0-85058481248
论文题名: Bottom-up and top-down effects of browning and warming on shallow lake food webs
作者: Vasconcelos F.R. ; Diehl S. ; Rodríguez P. ; Hedström P. ; Karlsson J. ; Byström P.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2019
卷: 25, 期: 2 起始页码: 504
结束页码: 521
语种: 英语
英文关键词: benthic and pelagic habitats
; bottom-up and top-down control
; browning
; food webs
; light and nutrients
; shallow lake
; top predator
; warming
Scopus关键词: benthos
; bottom-up approach
; climate change
; dissolved organic matter
; food web
; global change
; hydrological response
; light effect
; nutrient availability
; pelagic ecosystem
; shallow water
; top-down approach
; warming
; algae
英文摘要: Productivity and trophic structure of aquatic ecosystems result from a complex interplay of bottom-up and top-down forces that operate across benthic and pelagic food web compartments. Projected global changes urge the question how this interplay will be affected by browning (increasing input of terrestrial dissolved organic matter), nutrient enrichment and warming. We explored this with a process-based model of a shallow lake food web consisting of benthic and pelagic components (abiotic resources, primary producers, grazers, carnivores), and compared model expectations with the results of a browning and warming experiment in nutrient-poor ponds harboring a boreal lake community. Under low nutrient conditions, the model makes three major predictions. (a) Browning reduces light and increases nutrient supply; this decreases benthic and increases pelagic production, gradually shifting productivity from the benthic to the pelagic habitat. (b) Because of active habitat choice, fish exert top-down control on grazers and benefit primary producers primarily in the more productive of the two habitats. (c) Warming relaxes top-down control of grazers by fish and decreases primary producer biomass, but effects of warming are generally small compared to effects of browning and nutrient supply. Experimental results were consistent with most model predictions for browning: light penetration, benthic algal production, and zoobenthos biomass decreased, and pelagic nutrients and pelagic algal production increased with browning. Also consistent with expectations, warming had negative effects on benthic and pelagic algal biomass and weak effects on algal production and zoobenthos and zooplankton biomass. Inconsistent with expectations, browning had no effect on zooplankton and warming effects on fish depended on browning. The model is applicable also to nutrient-rich systems, and we propose that it is a useful tool for the exploration of the consequences of different climate change scenarios for productivity and food web dynamics in shallow lakes, the worldwide most common lake type. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117507
Appears in Collections: 气候变化与战略
There are no files associated with this item.
Recommended Citation:
Vasconcelos F.R.,Diehl S.,Rodríguez P.,et al. Bottom-up and top-down effects of browning and warming on shallow lake food webs[J]. Global Change Biology,2019-01-01,25(2)