气候变化领域集成服务门户(CCPortal): Microbial Assemblages and Metabolic Activity in Organic-Rich Subterranean Estuaries: Impact of Climate and Land Use Changes

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DOI	10.1029/2023JG007660
	Microbial Assemblages and Metabolic Activity in Organic-Rich Subterranean Estuaries: Impact of Climate and Land Use Changes
	Adyasari, Dini; Dimova, Natasha T.; Ni Chadhain, Sinead M.; Waska, Hannelore
发表日期	2024
ISSN	2169-8953
EISSN	2169-8961
起始页码	129
结束页码	3
卷号	129 期号:3
英文摘要	Microbial communities in subterranean estuaries mediate biogeochemical reactions of coastal groundwater discharging into the oceans; however, studies on their response to abrupt environmental changes caused by climate and land use alterations are still limited. In this study, we conducted a controlled laboratory study using combined geochemical and metagenomic approaches to investigate microbial structures and their metabolic pathways under a wide range of nitrate (NO3- ${{\text{NO}}_{3}}<^>{-}$) inputs, saline solutions, and incubation times. These factors served as proxies for land use, salinization of the shallow aquifer, and climate changes. We found a highly reducing habitat and an amplification of genes related to denitrification, sulfate reduction, and methanogenesis processes. Core communities consisting of Clostridia, Bacilli, Alphaproteobacteria, Gammaproteobacteria, and Desulfobaccia were observed across all treatments. The metabolic prediction of plant-derived organic matter (i.e., tannin and lignin) degradation was not affected by NO3- ${{\text{NO}}_{3}}<^>{-}$ inputs or salinity because of it being implemented by core communities and the abundance of electron donors and acceptors. Quantification of denitrification genes shows that they are susceptible to NO3- ${{\text{NO}}_{3}}<^>{-}$ inputs and seawater ions. Long-term incubation allowed sufficient time for microbes to degrade less labile DOM, promoting the re-release of buried solid phase organic matter into the active carbon cycle and increasing the relative abundance of biofilm or spore-forming taxa while decreasing that of rare taxa. Our results illustrate the sensitivity of microbial assemblages to environmental changes and their capacity to altering the C and N cycles in coastal areas, further affecting coastal water quality and ecosystem-scale biogeochemistry. This study investigated how microbial communities in subterranean estuaries (STE) respond to climate and land use changes. Understanding microbial responses is essential, considering microbes control the degradation of terrestrial-derived solutes transported to the ocean. STE sediments collected from different seasons were incubated with different nitrate inputs, saline solution, and incubation times to represent changing groundwater quality, sea level rise, and groundwater residence time, respectively. The relative proportions of core microbial groups (Clostridia, Bacilli, Alphaproteobacteria, Gammaproteobacteria, and Desulfobaccia) were stable across all treatments; however, less adaptable groups did not survive long incubation times. Seawater addition negatively affected nitrate removal, while changing environmental parameters did not significantly impact plant-derived organic matter degradation. The study highlights how microbial communities and metabolic processes related to the carbon and nitrogen cycles are susceptible to environmental change. Ultimately, these changes in the microbial community can affect water quality and ecosystem health in coastal areas. Core microbial communities, fermenters, and methanogens contributed to plant-derived particulate organic matter-to-dissolved organic matter (DOM) degradation in subterranean estuaries Denitrification is influenced by NO3- ${{\text{NO}}_{3}}<^>{-}$ concentrations and seawater ions Long-term incubation time allowed for less labile DOM microbial degradation and negatively influenced rare taxa
英文关键词	subterranean estuary; microbial ecology; dissolved organic matter; nitrogen; climate change
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号	WOS:001188233000001
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306683
作者单位	University of Alabama System; University of Alabama Tuscaloosa; Texas A&M University System; University of South Alabama; Carl von Ossietzky Universitat Oldenburg
推荐引用方式 GB/T 7714	Adyasari, Dini,Dimova, Natasha T.,Ni Chadhain, Sinead M.,et al. Microbial Assemblages and Metabolic Activity in Organic-Rich Subterranean Estuaries: Impact of Climate and Land Use Changes[J],2024,129(3).
APA	Adyasari, Dini,Dimova, Natasha T.,Ni Chadhain, Sinead M.,&Waska, Hannelore.(2024).Microbial Assemblages and Metabolic Activity in Organic-Rich Subterranean Estuaries: Impact of Climate and Land Use Changes.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,129(3).
MLA	Adyasari, Dini,et al."Microbial Assemblages and Metabolic Activity in Organic-Rich Subterranean Estuaries: Impact of Climate and Land Use Changes".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 129.3(2024).