Warming weakens facilitative interactions between decomposers and detritivores, and modifies freshwater ecosystem functioning

Global Change Biology
Tiago N BernabéGustavo Q Romero

Abstract

Warming is among the major drivers of changes in biotic interactions and, in turn, ecosystem functioning. The decomposition process occurs in a chain of facilitative interactions between detritivores and microorganisms. It remains unclear, however, what effect warming may have on the interrelations between detritivores and microorganisms, and the consequences for the functioning of natural freshwater ecosystems. To address these gaps, we performed a field experiment using tank bromeliads and their associated aquatic fauna. We manipulated the presence of bacteria and detritivorous macroinvertebrates (control, "bacteria," and "bacteria + macroinvertebrates") under ambient and warming scenarios, and analyzed the effects on the microorganisms and ecosystem functioning (detritus mass loss, colored dissolved organic matter, and nitrogen flux). We applied antibiotic solution to eliminate or reduce bacteria from control bromeliads. After 60 days incubation, bacterial density was higher in the presence than in the absence of macroinvertebrates. In the absence of macroinvertebrates, temperature did not influence bacterial density. However, in the presence of macroinvertebrates, bacterial density decreased by 54% with warming. The magnitu...Continue Reading

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Citations

Mar 15, 2019·Ecology·Robin M LeCraw, Diane S Srivastava
Jun 27, 2019·Proceedings. Biological Sciences·Sasha E GreenspanC Guilherme Becker
Jun 22, 2020·Current Opinion in Insect Science·Verónica Crespo-PérezRafael E Cárdenas
May 7, 2021·The Journal of Animal Ecology·Liam N NashPavel Kratina
Nov 23, 2021·The Journal of Animal Ecology·Pablo Augusto P AntiqueiraGustavo Quevedo Romero

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