nir gene-based co-occurrence patterns reveal assembly mechanisms of soil denitrifiers in response to fire

0542261 - BC 2022 RIV GB eng J - Článek v odborném periodiku
Goberna, M. - Donat, S. - Pérez Valera, Eduardo - Hallin, S. - Verdú, M.
nir gene-based co-occurrence patterns reveal assembly mechanisms of soil denitrifiers in response to fire.
Environmental Microbiology. Roč. 23, č. 1 (2021), s. 239-251. ISSN 1462-2912. E-ISSN 1462-2920
Institucionální podpora: RVO:60077344
Klíčová slova: nitrite reductase genes * phylogenetic structure * nitrogenase activity * ammonium-chloride * communities * nestedness * inhibition * components * networks * turnover
Obor OECD: Microbiology
Impakt faktor: 5.476, rok: 2021
Způsob publikování: Omezený přístup
https://sfamjournals.onlinelibrary.wiley.com/doi/10.1111/1462-2920.15298

Denitrification causes nitrogen losses from terrestrial ecosystems. The magnitude of nitrogen loss depends on the prevalence of denitrifiers, which show ecological differences if they harbour nirS or nirK genes encoding nitrite reductases with the same biological function. Thus, it is relevant to understand the mechanisms of co-existence of denitrifiers, including their response to environmental filters and competition due to niche similarities. We propose a framework to analyse the co-existence of denitrifiers across multiple assemblages by using nir gene-based co-occurrence networks. We applied it in Mediterranean soils before and during 1 year after an experimental fire. Burning did not modify nir community structure, but significantly impacted co-occurrence patterns. Bacteria with the same nir co-occurred in space, and those with different nir excluded each other, reflecting niche requirements: nirS abundance responded to nitrate and salinity, whereas nirK to iron content. Prior to fire, mutual exclusion between bacteria with the same nir suggested competition due to niche similarities. Burning provoked an immediate rise in mineral nitrogen and erased the signals of competition, which emerged again within days as nir abundances peaked. nir co-occurrence patterns can help infer the assembly mechanisms of denitrifying communities, which control nitrogen losses in the face of ecological disturbance.
Trvalý link: http://hdl.handle.net/11104/0324679