Competition and predation as possible causes of bacterial rarity

Environmental Microbiology
Viola KurmW H Gera Hol

Abstract

We assembled communities of bacteria and exposed them to different nutrient concentrations with or without predation by protists. Taxa that were rare in the field were less abundant at low nutrient concentrations than common taxa, independent of predation. However, some taxa that were rare in the field became highly abundant in the assembled communities, especially under ample nutrient availability. This high abundance points at a possible competitive advantage of some rare bacterial taxa under nutrient-rich conditions. In contrast, the abundance of most rare bacterial taxa decreased at low resource availability. Since low resource availability will be the prevailing situation in most soils, our data suggests that under those conditions poor competitiveness for limiting resources may contribute to bacterial rarity. Interestingly, taxa that were rare in the field and most successful under predator-free conditions in the lab also tended to be more reduced by predation than common taxa. This suggests that predation contributes to rarity of bacterial taxa in the field. We further discuss whether there may be a trade-off between competitiveness and predation resistance. The substantial variability among taxa in their responses to co...Continue Reading

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Citations

Feb 9, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Joanna BrzeszczAnna Turkiewicz
Nov 12, 2020·FEMS Microbiology Ecology·Francisco PascoalCatarina Magalhães
Dec 23, 2021·Scientific Reports·Verena VogelBarbara Spellerberg

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Methods Mentioned

BETA
PCR

Software Mentioned

lmerTest
UCLUST
R
VSEARCH
R Studio R
package
lme4

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