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Taxonomic differences shape the responses of freshwater aerobic anoxygenic phototrophic bacterial communities to light and predation

AuthorsRuiz-González, Clara ; García Chaves, María Carolina; Ferrera, Isabel ; Niño-García, Juan Pablo; Del Giorgio, Paul A.
KeywordsAerobic anoxygenic phototrophic bacteria
Functional groups
Illumina sequencing
Lake ecosystems
Light effects
Predation control
pufM gene
Issue DateApr-2020
CitationMolecular Ecology 29(7): 1267-1283 (2020)
AbstractAerobic anoxygenic phototrophic (AAP) bacteria are a phylogenetically diverse and ubiquitous group of prokaryotes that use organic matter but can harvest light using bacteriochlorophyll a. Although the factors regulating AAP ecology have long been investigated through field surveys, the few available experimental studies have considered AAPs as a group, thus disregarding the potential differential responses between taxonomically distinct AAP assemblages. Here, we used sequencing of the pufM gene to describe the diversity of AAPs in 10 environmentally distinct temperate lakes, and to investigate the taxonomic responses of AAP communities in these lakes when subjected to similar experimental manipulations of light and predator removal. The studied communities were clearly dominated by Limnohabitans AAP but presented a clear taxonomic segregation between lakes presumably driven by local conditions, which was maintained after experimental manipulations. Predation reduction (but not light exposure) caused significant compositional shifts across most assemblages, but the magnitude of these changes could not be clearly related to changes in bulk AAP abundances or taxonomic richness of AAP assemblages during experiments. Only a few operational taxonomic units, which differed taxonomically between lakes, were found to respond positively during experimental treatments. Our results highlight that different freshwater AAP communities respond differently to similar control mechanisms, highlighting that in‐depth knowledge on AAP diversity is essential to understand the ecology and potential role of these photoheterotrophs
Description.-- 17 pages, 6 figures, 3 tables, supporting information https://doi.org/10.1111/mec.15404
Publisher version (URL)https://doi.org/10.1111/mec.15404
Identifiersdoi: 10.1111/mec.15404
issn: 0962-1083
e-issn: 1365-294X
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