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Extreme rainfall events alter the trophic structure in bromeliad tanks across the Neotropics

Gustavo Romero 1 Nicholas Marino 2 A Andrew M Macdonald Reǵis Ceŕeǵhino 3 M Trzcinski Acosta Mercado Céline Leroy 4 Bruno Corbara 5 Vinicius Farjalla Ignacio Barberis Olivier Deźerald Edd Hammill Trisha Atwood Gustavo Piccoli Fabiola Ospina Bautista Jean-Francois Carrias 5 Juliana Leal Guillermo Montero Pablo Antiqueira Rodrigo Freire Emilio Realpe Sarah Amundrud Paula de Omena Alice Campos 6 Pavel Kratina Eoin O'gorman Diane Srivastava 7
1 UNICAMP - University of Campinas [Campinas]
2 UFRJ - Universidade Federal do Rio de Janeiro
3 ECOLAB - Laboratoire Ecologie Fonctionnelle et Environnement
4 UMR AMAP - Botanique et Modélisation de l'Architecture des Plantes et des Végétations
5 LMGE - Laboratoire Microorganismes : Génome et Environnement
6 UNIRIO - Universidade Federal do Estado do Rio de Janeiro
7 UBC - University of British Columbia
Abstract : 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°N to 29°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.
Keywords : Climatic Changes Neotropic Tank bromeliads
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Submitted on : Thursday, July 2, 2020 - 1:43:45 PM
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Gustavo Romero, Nicholas Marino, A Andrew, M Macdonald, Reǵis Ceŕeǵhino, et al.. Extreme rainfall events alter the trophic structure in bromeliad tanks across the Neotropics. Nature Communications, Nature Publishing Group, 2020, 11 (1), pp.3215. ⟨10.1038/s41467-020-17036-4⟩. ⟨hal-02887639⟩

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