Out of sight, but not out of season: Nitrifier distributions and population dynamics in a large oligotrophic lake.

Autor: Peoples LM; Flathead Lake Biological Station, University of Montana, Polson, Montana, USA., Seixas MH; Flathead Lake Biological Station, University of Montana, Polson, Montana, USA., Evans KA; Flathead Lake Biological Station, University of Montana, Polson, Montana, USA., Bilbrey EM; Flathead Lake Biological Station, University of Montana, Polson, Montana, USA.; Department of Biological Sciences, Idaho State University, Pocatello, Idaho, USA., Ranieri JR; Flathead Lake Biological Station, University of Montana, Polson, Montana, USA., Tappenbeck TH; Flathead Lake Biological Station, University of Montana, Polson, Montana, USA., Dore JE; Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana, USA., Baumann A; Flathead Lake Biological Station, University of Montana, Polson, Montana, USA., Church MJ; Flathead Lake Biological Station, University of Montana, Polson, Montana, USA.
Jazyk: angličtina
Zdroj: Environmental microbiology [Environ Microbiol] 2024 Mar; Vol. 26 (3), pp. e16616.
DOI: 10.1111/1462-2920.16616
Abstrakt: Nitrification is an important control on the form and distribution of nitrogen in freshwater ecosystems. However, the seasonality of nitrogen pools and the diversity of organisms catalyzing this process have not been well documented in oligotrophic lakes. Here, we show that nitrogen pools and nitrifying organisms in Flathead Lake are temporally and vertically dynamic, with nitrifiers displaying specific preferences depending on the season. While the ammonia-oxidizing bacteria (AOB) Nitrosomonadaceae and nitrite-oxidizing bacteria (NOB) Nitrotoga dominate at depth in the summer, the ammonia-oxidizing archaea (AOA) Nitrososphaerota and NOB Nitrospirota become abundant in the winter. Given clear seasonality in ammonium, with higher concentrations during the summer, we hypothesize that the succession between these two nitrifying groups may be due to nitrogen affinity, with AOB more competitive when ammonia concentrations are higher and AOA when they are lower. Nitrifiers in Flathead Lake share more than 99% average nucleotide identity with those reported in other North American lakes but are distinct from those in Europe and Asia, indicating a role for geographic isolation as a factor controlling speciation among nitrifiers. Our study shows there are seasonal shifts in nitrogen pools and nitrifying populations, highlighting the dynamic spatial and temporal nature of nitrogen cycling in freshwater ecosystems.
(© 2024 The Authors. Environmental Microbiology published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
Externí odkaz: