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Food web- and environment- mediated multifunctional response of freshwater ecosystems to drought

Abstract : Anthropogenic climate change is predicted to increase the frequency and intensity of extreme climatic events such as severe droughts. The hydrology of freshwater ecosystems is expected to be affected by altered precipitation patterns, with important consequences for the temporal stability of biological communities and the ecosystem processes they support. Resilience, the capacity of an ecosystem to maintain its state and to recover from disturbances, is a major component of temporal stability. Resilience to drought is inherent to ecosystems that are periodically subject to hydrological resetting (e.g., Mediterranean systems). Under the Neotropics, the impacts of severe drought events on ecosystem functions are far less well understood, as are the biological and ecological mechanisms which underlie resilience after the disturbance has passed. The biodiversity of neotropical ecosystems is among the highest in the world, but it should paradoxically be most affected by major global changes. Yet, only a few studies have examined how drought can affect the multiple functions of neotropical freshwater ecosystems, and these studies focused on the immediate outcome of drought (“before-after” comparisons), ignoring the recovery trajectories. In this thesis, I explored the resilience of neotropical freshwater communities and ecosystem processes following drought disturbances, in relation to community taxonomic and functional structure and environmental conditions. I showed that resilience can be modulated locally by the harshness of the current drought (Chapter 1), and to a lesser extent by the harshness of the historical drought regime (Chapter 3). At a larger regional scale, I discovered that the subsidy of allochthonous organic matter from the terrestrial matrix (Chapter 2) and of migrants from the metacommunity (Chapter 1 and 2) can also foster local resilience to drought
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Submitted on : Monday, December 6, 2021 - 9:49:32 AM
Last modification on : Tuesday, January 4, 2022 - 6:03:28 AM


  • HAL Id : tel-03466642, version 1


Camille Bonhomme. Food web- and environment- mediated multifunctional response of freshwater ecosystems to drought. Biodiversity and Ecology. Universidade Federal do Rio de Janeiro, 2021. English. ⟨tel-03466642⟩



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