干旱区生态环境知识资源中心(Arid): Watershed hydrology and salinity, but not nutrient chemistry, are associated with arid-land stream microbial diversity

Arid

DOI	10.1086/701597
	Watershed hydrology and salinity, but not nutrient chemistry, are associated with arid-land stream microbial diversity
	Zeglin, Lydia H.1,2; Crenshaw, Chelsea L.1; Dahm, Clifford N.1; Sheibley, Richard W.3; Takacs-Vesbach, Cristina D.2
通讯作者	Zeglin, Lydia H.
来源期刊	FRESHWATER SCIENCE
ISSN	2161-9549
EISSN	2161-9565
出版年	2019
卷号	38 期号:1 页码:77-91
英文摘要	Microbiota in streams drive many ecosystem functions, including whole-stream metabolism, nitrogen (N) cycling, and the production of basal resources that fuel stream food webs. Interactions between surface water and shallow, subsurface groundwater produce the oxygen and nutrient gradients that influence these microbially mediated biogeochemical functions. Microbial nutrient processing is often limited by nutrient availability, but we lack a clear understanding of the relationships between hydrology, water chemistry, microbial composition, and nutrient cycling. In this study we evaluated the prediction that the microbial (bacterial and archaeal) assemblage composition in surface and subsurface water (both within and among stream reaches) would be related to dissolved nutrient concentrations, surface-subsurface hydrologic connectivity, and reach-scale N cycling rates. To evaluate our predictions, we collected data on water chemistry, whole-stream hydrological connectivity, biogeochemical function, and surface and subsurface water microbial assemblage composition at 6 streams in the southwestern USA. We found no correlation between microbial assemblage composition and stream nutrient concentrations or cycling rates, but observed that subsurface waters in some streams had higher taxonomic richness than surface waters. Instead, differences in microbial assemblage composition among the study streams were correlated with both watershed size and stream water Br- concentrations. These results suggest that the longer, deeper groundwater flowpaths in larger watersheds, which promote solute accumulation, influence streamwater microbial assemblage composition. These contrasting streamwater microbial assemblages were associated with different reach-scale sinks for N immobilization (fine benthic organic matter versus filamentous algae). Overall, results suggest that the catchment-scale history of water movement, and salinity, may affect both microbial diversity and the fate of N. The mechanisms by which stream microbial diversity influences ecosystem function require more attention. In particular, we need a better understanding of how microbial biogeography is influenced by the spatiotemporal heterogeneity of stream ecosystems.
英文关键词	arid-land streams surface-subsurface interactions nitrogen uptake microbial diversity bacteria archaea 16S rRNA gene watershed residence time
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000463819900007
WOS关键词	HYPORHEIC ZONE ; BACTERIAL COMMUNITY ; NITRATE REMOVAL ; NITROGEN DYNAMICS ; DENITRIFICATION ; ECOSYSTEMS ; RETENTION ; BIOFILM ; METABOLISM ; BIOGEOGRAPHY
WOS类目	Ecology ; Marine & Freshwater Biology
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215741
作者单位	1.Kansas State Univ, Div Biol, Manhattan, KS 66547 USA; 2.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA; 3.US Geol Survey, Washington Water Sci Ctr, Tacoma, WA 98402 USA
推荐引用方式 GB/T 7714	Zeglin, Lydia H.,Crenshaw, Chelsea L.,Dahm, Clifford N.,et al. Watershed hydrology and salinity, but not nutrient chemistry, are associated with arid-land stream microbial diversity[J]. United States Geological Survey,2019,38(1):77-91.
APA	Zeglin, Lydia H.,Crenshaw, Chelsea L.,Dahm, Clifford N.,Sheibley, Richard W.,&Takacs-Vesbach, Cristina D..(2019).Watershed hydrology and salinity, but not nutrient chemistry, are associated with arid-land stream microbial diversity.FRESHWATER SCIENCE,38(1),77-91.
MLA	Zeglin, Lydia H.,et al."Watershed hydrology and salinity, but not nutrient chemistry, are associated with arid-land stream microbial diversity".FRESHWATER SCIENCE 38.1(2019):77-91.