Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-020-17036-4
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Funding
- Sao Paulo Research Foundation (FAPESP) [2012/51143-3, 2017/09052-4, 2016/01209-9]
- CNPq [550022/2014-7]
- Agence Nationale de la Recherche (ANR), Rainwebs project [ANR-12-BSV7-0022-01]
- Investissement d'Avenir grant (Labex CEBA) [ANR-10-LABX-25-01]
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT-2010-1614]
- Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Rosario [AGR-139]
- Brazilian Council for Research, Development and Innovation (CNPq) [400454/2014-9]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Facultad de Ciencias, Universidad de los Andes, Colombia [2012-1]
- ANR
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- FAPESP [2014/04603-4, 2017/26243-8]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [PNPD-CAPES 2013/0877, PNPD-CAPES 2014/04603-4]
- Fond Social Europeen
- NSERC
- University of British Columbia
- Departamento Administrativo de Ciencia, Tecnologia e Innovacion (COLCIENCIAS) [567]
- Royal Society
- Newton Advanced Fellowship [NAF/R2/180791]
- NERC [NE/L011840/1]
- FINEP [01.13.0353.00]
- NERC [NE/L011840/2, NE/L011840/1] Funding Source: UKRI
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [17/26243-8] Funding Source: FAPESP
- Agence Nationale de la Recherche (ANR) [ANR-12-BSV7-0022] Funding Source: Agence Nationale de la Recherche (ANR)
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Changes in global and regional precipitation regimes are among the most pervasive components of climate change. Intensification of rainfall cycles, ranging from frequent downpours to severe droughts, could cause widespread, but largely unknown, alterations to trophic structure and ecosystem function. We conducted multi-site coordinated experiments to show how variation in the quantity and evenness of rainfall modulates trophic structure in 210 natural freshwater microcosms (tank bromeliads) across Central and South America (18 degrees N to 29 degrees S). The biomass of smaller organisms (detritivores) was higher under more stable hydrological conditions. Conversely, the biomass of predators was highest when rainfall was uneven, resulting in top-heavy biomass pyramids. These results illustrate how extremes of precipitation, resulting in localized droughts or flooding, can erode the base of freshwater food webs, with negative implications for the stability of trophic dynamics. The amount and frequency of rainfall structures aquatic food webs. Here the authors show that in tropical tank bromeliads, lower trophic levels are more abundant in stable rainfall conditions, while biomass pyramids are inverted in conditions with periodic droughts.
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