Srivastava D. S. auteur aut IRD Cereghino R. auteur aut IRD Trzcinski M. K. auteur aut IRD MacDonald A. A. M. auteur aut IRD Marino N. A. C. auteur aut IRD Mercado D. A. auteur aut IRD Leroy Céline auteur aut IRD Corbara B. auteur aut IRD Romero G. Q. auteur aut IRD Farjalla V. F. auteur aut IRD Barberis I. M. auteur aut IRD Dezerald O. auteur aut IRD Hammill E. auteur aut IRD Atwood T. B. auteur aut IRD Piccoli G. C. O. auteur aut IRD Ospina-Bautista F. auteur aut IRD Carrias J. F. auteur aut IRD Leal J. S. auteur aut IRD Montero G. auteur aut IRD Antiqueira P. A. P. auteur aut IRD Freire R. auteur aut IRD Realpe E. auteur aut IRD Amundrud S. L. auteur aut IRD deOmena P. M. auteur aut IRD Campos A. B. A. auteur aut IRD text journalArticle eng text/pdf born digital access There is growing recognition that ecosystems may be more impacted by infrequent extreme climatic events than by changes in mean climatic conditions. This has led to calls for experiments that explore the sensitivity of ecosystems over broad ranges of climatic parameter space. However, because such response surface experiments have so far been limited in geographic and biological scope, it is not clear if differences between studies reflect geographic location or the ecosystem component considered. In this study, we manipulated rainfall entering tank bromeliads in seven sites across the Neotropics, and characterized the response of the aquatic ecosystem in terms of invertebrate functional composition, biological stocks (total invertebrate biomass, bacterial density) and ecosystem fluxes (decomposition, carbon, nitrogen). Of these response types, invertebrate functional composition was the most sensitive, even though, in some sites, the species pool had a high proportion of drought-tolerant families. Total invertebrate biomass was universally insensitive to rainfall change because of statistical averaging of divergent responses between functional groups. The response of invertebrate functional composition to rain differed between geographical locations because (1) the effect of rainfall on bromeliad hydrology differed between sites, and invertebrates directly experience hydrology not rainfall and (2) the taxonomic composition of some functional groups differed between sites, and families differed in their response to bromeliad hydrology. These findings suggest that it will be difficult to establish thresholds of "safe ecosystem functioning" when ecosystem components differ in their sensitivity to climatic variables, and such thresholds may not be broadly applicable over geographic space. In particular, ecological forecast horizons for climate change may be spatially restricted in systems where habitat properties mediate climatic impacts, and those, like the tropics, with high spatial turnover in species composition. specialized contingency distributed experiment freshwater global change biology macroinvertebrates phytotelmata precipitation GUYANE FRANCAISE COSTA RICA COLOMBIE PORTO RICO BRESIL ARGENTINE AMERIQUE CENTRALE AMERIQUE DU SUD ZONE TROPICALE 082 036 021 101 4 art. e02984 [15 ] 2020 0012-9658 https://www.documentation.ird.fr/hor/fdi:010077951 10.1002/ecy.2984 0012-9658 [F B010077951] https://www.documentation.ird.fr/hor/fdi:010077951 https://www.documentation.ird.fr/intranet/publi/depot/2020-06-26/010077951.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2020-05-18 2025-02-24 fdi:010077951 fre