Groundwater–surface water mixing shifts ecological assembly processes and stimulates organic carbon turnover

Nature Communications, Journal Year: 2016, Volume and Issue: 7(1)

Published: April 7, 2016

Environmental transitions often result in resource mixtures that overcome limitations to microbial metabolism, resulting biogeochemical hotspots and moments. Riverine systems, where groundwater mixes with surface water (the hyporheic zone), are spatially complex temporally dynamic, making development of predictive models challenging. Spatial temporal variations zone communities a key, but understudied, component riverine function. Here, investigate the coupling among groundwater–surface mixing, biogeochemistry, we apply ecological theory, aqueous DNA sequencing ultra-high-resolution organic carbon profiling field samples collected across times locations representing broad range mixing conditions. Our results indicate stimulates heterotrophic respiration, alters composition, causes processes shift from stochastic deterministic is associated elevated abundances taxa may degrade suite compounds. Groundwater-surface zones link critical ecosystem domains, attendant microbe-biogeochemistry-hydrology interactions poorly known. authors show groundwater-surface shifts ecology deterministic.

Language: Английский

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Transit times—the link between hydrology and water quality at the catchment scale

Wiley Interdisciplinary Reviews Water, Journal Year: 2016, Volume and Issue: 3(5), P. 629 - 657

Published: May 16, 2016

In spite of trying to understand processes in the same spatial domain, catchment hydrology and water quality scientific communities are relatively disconnected so their respective models. This is emphasized by an inadequate representation transport processes, both catchment‐scale hydrological While many models at scale only account for pressure propagation not mass transfer, typically limited overly simplistic representations flow processes. With objective raising awareness this issue outlining potential ways forward we provide a nontechnical overview (1) importance hydrology‐controlled through systems as link between quality; (2) limitations current generation models; (3) concept transit times tools quantify transport; (4) benefits time based formulations solute There emerging evidence that explicit formulation on has improve understanding integrated system dynamics catchments stronger WIREs Water 2016, 3:629–657. doi: 10.1002/wat2.1155 article categorized under: Science > Hydrological Processes Quality

Language: Английский

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Multiscale geophysical imaging of the critical zone

Reviews of Geophysics, Journal Year: 2014, Volume and Issue: 53(1), P. 1 - 26

Published: Dec. 13, 2014

Abstract Details of Earth's shallow subsurface—a key component the critical zone (CZ)—are largely obscured because making direct observations with sufficient density to capture natural characteristic spatial variability in physical properties is difficult. Yet this inaccessible region CZ fundamental processes that support ecosystems, society, and environment. Geophysical methods provide a means for remotely examining form function over length scales span centimeters kilometers. Here we present review highlighting application geophysical science research questions. In particular, consider map geometry structural features such as regolith thickness, lithological boundaries, permafrost extent, snow or root zones. Combined knowledge structure, discuss how are used understand processes. Fluxes between snow, surface water, groundwater affect weathering, resources, chemical nutrient exports rivers. The exchange gas soil atmosphere have been studied using wetland areas. Indirect necessary complement obtained by drilling field mapping. Direct measurements should be calibrate estimates, which can then extrapolate interpretations larger areas monitor changing time. Advances instrumentation computational approaches integrating different types data great potential fill gaps our understanding subsurface portion integrated where possible future research.

Language: Английский

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Heat as a tracer to quantify water flow in near-surface sediments

Earth-Science Reviews, Journal Year: 2013, Volume and Issue: 129, P. 40 - 58

Published: Dec. 1, 2013

Language: Английский

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Ecohydrological interfaces as hot spots of ecosystem processes

Water Resources Research, Journal Year: 2017, Volume and Issue: 53(8), P. 6359 - 6376

Published: April 30, 2017

Abstract The movement of water, matter, organisms, and energy can be altered substantially at ecohydrological interfaces, the dynamic transition zones that often develop within ecotones or boundaries between adjacent ecosystems. Interdisciplinary research over last two decades has indicated interfaces are “hot spots” ecological, biogeochemical, hydrological processes may provide refuge for biota during extreme events. Ecohydrological have significant impact on global biogeochemical cycles, biodiversity, pollutant removal, ecosystem resilience to disturbance. organizational principles (i.e., drivers controls) spatially temporally variable poorly understood require integrated analysis hydrological, ecological processes. Our rudimentary understanding interactions different controls critically limits our ability predict complex system responses change. In this paper, we explore similarities contrasts in functioning diverse freshwater across spatial temporal scales. We use comparison an integrated, interdisciplinary framework, including a roadmap analyzing their argue that, order fully account nonlinear process dynamics, need conceptualized as unique, entities, which represents step change from current representation boundary conditions investigated

Language: Английский

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Influences of organic carbon speciation on hyporheic corridor biogeochemistry and microbial ecology

Nature Communications, Journal Year: 2018, Volume and Issue: 9(1)

Published: Feb. 2, 2018

The hyporheic corridor (HC) encompasses the river-groundwater continuum, where mixing of groundwater (GW) with river water (RW) in HC can stimulate biogeochemical activity. Here we propose a novel thermodynamic mechanism underlying this phenomenon and reveal broader impacts on dissolved organic carbon (DOC) microbial ecology. We show that thermodynamically favorable DOC accumulates GW despite lower concentration, RW contains less-favorable DOC, but at higher concentrations. This indicates is protected from oxidation by low total energy within pool, whereas favorability species. GW-RW overcomes these protections stimulates respiration. Mixing models coupled geophysical molecular analyses further tipping points spatiotemporal dynamics indicate important hydrology-biochemistry-microbial feedbacks. Previously unrecognized mechanisms regulated may therefore strongly influence riverine ecosystems.

Language: Английский

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Is the Hyporheic Zone Relevant beyond the Scientific Community?

Water, Journal Year: 2019, Volume and Issue: 11(11), P. 2230 - 2230

Published: Oct. 25, 2019

Rivers are important ecosystems under continuous anthropogenic stresses. The hyporheic zone is a ubiquitous, reactive interface between the main channel and its surrounding sediments along river network. We elaborate on physical, biological, biogeochemical drivers processes within that have been studied by multiple scientific disciplines for almost half century. These previous efforts shown modulator most metabolic stream serves as refuge habitat diverse range of aquatic organisms. It also exerts major control water quality increasing contact time with environments, which in turn results retention transformation nutrients, trace organic compounds, fine suspended particles, microplastics, among others. paper showcases critical importance zones, both from an applied perspective, their role ecosystem services to answer question manuscript title. identifies research gaps our understanding processes. In conclusion, we highlight potential restoration efficiently manage reactivate functions corridors.

Language: Английский

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Modeling groundwater and surface water interaction: An overview of current status and future challenges

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 846, P. 157355 - 157355

Published: July 16, 2022

Language: Английский

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Review of Endocrine Disrupting Compounds (EDCs) in China's water environments: Implications for environmental fate, transport and health risks

Water Research, Journal Year: 2023, Volume and Issue: 245, P. 120645 - 120645

Published: Sept. 18, 2023

Language: Английский

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The hyporheic zone as an invertebrate refuge: a review of variability in space, time, taxa and behaviour

Marine and Freshwater Research, Journal Year: 2012, Volume and Issue: 63(4), P. 293 - 293

Published: Jan. 1, 2012

The hyporheic zone is a potential refuge that can promote persistence of benthic invertebrates during adverse conditions in surface streams. For decades, changes invertebrate depth distribution have been investigated relation to flood, low flow and drying events, but evidence for use the remains equivocal. This review examines zone’s refugial role hydrological conditions. Refuge influenced by determinants four categories. First, varies spatially physical habitat parameters, including sediment porosity hydrologic exchange. Second, temporally variable reflects disturbance characteristics rate onset. Third, taxon-specific, depending on range morphological, behavioural physiological traits. Fourth, behaviours governing vary, with both active migrations passive playing important roles community persistence. These interact influence use; example, providing an adequate will vary between taxa. Despite this variability, component suite refuges facilitate resilience events. As such, its ecological integrity should be safeguarded through sensitive management effective rehabilitation schemes.

Language: Английский

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