Resources alter the structure and increase stochasticity in bromeliad microfauna communities

PloS One
Jana S PetermannDiane S Srivastava

Abstract

Although stochastic and deterministic processes have been found to jointly shape structure of natural communities, the relative importance of both forces may vary across different environmental conditions and across levels of biological organization. We tested the effects of abiotic environmental conditions, altered trophic interactions and dispersal limitation on the structure of aquatic microfauna communities in Costa Rican tank bromeliads. Our approach combined natural gradients in environmental conditions with experimental manipulations of bottom-up interactions (resources), top-down interactions (predators) and dispersal at two spatial scales in the field. We found that resource addition strongly increased the abundance and reduced the richness of microfauna communities. Community composition shifted in a predictable way towards assemblages dominated by flagellates and ciliates but with lower abundance and richness of algae and amoebae. While all functional groups responded strongly and predictably to resource addition, similarity among communities at the species level decreased, suggesting a role of stochasticity in species-level assembly processes. Dispersal limitation did not affect the communities. Since our design exc...Continue Reading

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Citations

Mar 7, 2017·Ecology and Evolution·Pavel KratinaDiane S Srivastava
May 18, 2018·Global Change Biology·Pablo Augusto P AntiqueiraGustavo Quevedo Romero
Aug 6, 2019·Ecology and Evolution·Geraldine LadinoPavel Kratina

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