Microbial abundance and activity of nitrite/nitrate-dependent anaerobic methane oxidizers in estuarine and intertidal wetlands: Heterogeneity and driving factors

The denitrifying anaerobic methane oxidation process and microorganisms in the environments: A review

“…Moreover, the nitrite-dependent AMO activity was higher than the nitratedependent pathway, consistent with their findings for the freshwater marshes (Shen et al, 2017). These two papers were co-cited later by authors other than the Shen group focusing on similar topics, such as by Chen et al (2021), who compared nitrite-/nitrate-dependent DAMO in estuaries and intertidal wetlands in the Yangtze Estuary.…”

“…The limited studies considered both DAMO processes show that their relative abundances and activities can vary from different habitats even within the same system. For example, Chen et al (2021) sampled multiple locations along the salinity gradient of the Yangtze Estuary and studied the distributions of both nitrate-and nitrite-dependent DAMO.…”

Significance of anaerobic oxidation of methane (AOM) in mitigating methane emission from major natural and anthropogenic sources: a review of AOM rates in recent publications

“…Hence, the median of commonly reported active depths is used to estimate the areal flux of methane. Based on the commonly reported active depth of AOM, 40 [Q1–Q3: 20–100] cm, 62,63,66,74–77 the active depth of aerobic methane oxidation, 7.5 [Q1–Q3: 3.6–15.3] cm, 57,78–81 and the estimated global freshwater wetland area (5.69 × 10 12 m 2 ), 4 the respective methane oxidation rates suggest that anoxic and aerobic methanotrophs have the capability of reducing methane emission by approximately 45 [Q1–Q3: 23–92] Tg CH 4 per year and 389 [Q1–Q3: 103–1854] Tg CH 4 per year, respectively (Table 1). The methane oxidation via AOM extrapolated by Segarra et al 4 is 200 Tg CH 4 per year (data from three wetlands) and AOM solely due to the oxidation by natural organic matter was estimated to be over 1300 Tg CH 4 per year (data from one wetland).…”

“…210,211 For instance, the incubation of sediments collected from various sites along the riverbank in the Yangtze Estuary in China showed active nitrite-DAMO at 0.2–84.3 nmol CO 2 g −1 d −1 and nitrate-DAMO at 0.4–32.6 nmol CO 2 g −1 d −1 . 74 The incubation and analysis of sediments from marine coastal ecosystems found that DAMO bacteria are active. 22,163 These observations corroborated the previous results from the analysis of the 16S rRNA gene and pmoA sequences of DAMO bacteria, which indicate that their richest community is from marine and coastal environments.…”

Microbial Niche Differentiation during Nitrite-Dependent Anaerobic Methane Oxidation

“…The nitrite-dependent anaerobic methane oxidation (n-DAMO) process, which couples anaerobic oxidation of methane (AOM) to nitrite reduction and is catalyzed by the bacteria within the methanotrophic NC10 phylum, has been discovered during the last two decades and identified as a crucial methane sink in the ecosystem. − n-DAMO bacteria are suggested to oxidize methane via a unique intra-aerobic pathway with nitrite as the electron acceptor, , which have been detected in diverse environments ranging from freshwater systems, marine systems, peatlands, paddy soils, cavern spring water, and synthetic ecosystem . Moreover, the n-DAMO process has attracted much attention recently as a promising clean bioprocess for denitrification in sewage treatment due to significant energy saving and GHG reduction …”