%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Rosero-Lopez, D.
%A Walter, M. T.
%A Flecker, A. S.
%A De Bievre, B.
%A Osorio, R.
%A Gonzalez-Zeas, D.
%A Cauvy-Fraunie, S.
%A Dangles, Olivier
%T A whole-ecosystem experiment reveals flow-induced shifts in a stream community
%D 2022
%L fdi:010084756
%G ENG
%J Communications Biology
%K EQUATEUR ; ANDES ; ZONE TROPICALE ; MONDE ; CAYAMBE COCA PARC NATIONAL ; CHALPI GRANDE BASSIN VERSANT
%M ISI:000791409700006
%N 1
%P 420 [8 ]
%R 10.1038/s42003-022-03345-5
%U https://www.documentation.ird.fr/hor/fdi:010084756
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2022-06/010084756.pdf
%V 5
%W Horizon (IRD)
%X The growing threat of abrupt and irreversible changes to the functioning of freshwater ecosystems compels robust measures of tipping point thresholds. To determine benthic cyanobacteria regime shifts in a potable water supply system in the tropical Andes, we conducted a whole ecosystem-scale experiment in which we systematically diverted 20 to 90% of streamflow and measured ecological responses. Benthic cyanobacteria greatly increased with a 60% flow reduction and this tipping point was related to water temperature and nitrate concentration increases, both known to boost algal productivity. We supplemented our experiment with a regional survey collecting > 1450 flow-benthic algal measurements at streams varying in water abstraction levels. We confirmed the tipping point flow value, albeit at a slightly lower threshold (40-50%). A global literature review broadly confirmed our results with a mean tipping point at 58% of flow reduction. Our study provides robust in situ demonstrations of regime shift thresholds in running waters with potentially strong implications for environmental flows management. Experimental stream manipulation in a mountain river system in the tropical Andes initiates a regime shift of benthic cyanobacteria. This whole-ecosystem experiment in conjunction with a global synthesis reveal regime shift tipping points dependent upon freshwater streamflow.
%$ 036 ; 034 ; 021