Competitive species interactions constrain abiotic adaptation in a bacterial soil community. Issue 6 (1st December 2018)

• Record Type: Journal Article
• Authors: Hall, James P. J.; Harrison, Ellie; Brockhurst, Michael A.
• Is Part Of: Evolution letters. Volume 2:Issue 6(2018)
• Page Start: 580
• Page End: 589
• Publication Date: 2018-12-01
• Subjects: Adaptation -- competition -- experimental evolution -- nutrient scavenging -- Pseudomonas fluorescens -- soil microbiology; Evolution (Biology) -- Periodicals; Evolution (Biology); Biological Evolution; Electronic journals; Fulltext; Internet Resources; Periodicals; Periodicals; Periodical; 576.8
• DOI: 10.1002/evl3.83
• Languages: English
• ISSNs: 2056-3744

Abstract

Abstract: Studies of abiotic adaptation often consider single species in isolation, yet natural communities contain many coexisting species which could limit or promote abiotic adaptation. Here we show, using soil bacterial communities, that evolving in the presence of a competitor constrained abiotic adaptation. Specifically, Pseudomonas fluorescens evolved alone was fitter than P. fluorescens evolved alongside Pseudomonas putida, when P. putida was absent. Genome analyses indicated this was due to mutation of the acetate scavenger actP, which occurred exclusively, and almost universally, in single-species-evolved clones. actP disruption was associated with increased growth in soil compared with wild-type actP, but this benefit was abolished when P. putida was present, suggesting a role for carbon scavenging transporters in species interactions, possibly through nutrient competition. Our results show that competitive species interactions can limit the evolutionary response to abiotic selection, because the fitness benefits of abiotic adaptive mutations were negated in more complex communities.