Absence of stress-promoted facilitation coupled with a competition decrease in the microbiome of ephemeral saline lakes
AffiliationDepartment of Environmental Science, University of Arizona
stress gradient hypothesis
MetadataShow full item record
PublisherEcological Society of America
CitationMenéndez-Serra, M., Ontiveros, V. J., Barberán, A., & Casamayor, E. O. (2022). Absence of stress-promoted facilitation coupled with a competition decrease in the microbiome of ephemeral saline lakes. Ecology.
RightsCopyright © 2022 The Authors. Ecology published by Wiley Periodicals LLC on behalf of The Ecological Society of America.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractSalinity fluctuations constitute a well-known high stress factor strongly shaping global biological distributions and abundances. However, there is a knowledge gap regarding how increasing saline stress affects microbial biological interactions. We applied the combination of a probabilistic method for estimating significant co-occurrences/exclusions and a conceptual framework for filtering out associations potentially linked to environmental and/or spatial factors, in a series of connected ephemeral (hyper) saline lakes. We carried out a network analysis over the full aquatic microbiome—bacteria, eukarya, and archaea—under severe salinity fluctuations. Most of the observed co-occurrences/exclusions were potentially explained by environmental niche and/or dispersal limitation. Co-occurrences assigned to potential biological interactions remained stable, suggesting that the salt gradient was not promoting interspecific facilitation processes. Conversely, co-exclusions assigned to potential biological interactions decreased along the gradient both in number and network complexity, pointing to a decrease of interspecies competition as salinity increased. Overall, higher saline stress reduced microbial co-exclusions while co-occurrences remained stable suggesting decreasing competition coupled with lack of stress-gradient promoted facilitation in the microbiome of ephemeral saline lakes. © 2022 The Authors. Ecology published by Wiley Periodicals LLC on behalf of The Ecological Society of America.
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