Interactions between groundwater and surface water: the state of the science

Hydrogeology Journal, Journal Year: 2002, Volume and Issue: 10(1), P. 52 - 67

Published: Jan. 11, 2002

Language: Английский

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Riverine landscape diversity

Freshwater Biology, Journal Year: 2002, Volume and Issue: 47(4), P. 517 - 539

Published: April 1, 2002

1. This review is presented as a broad synthesis of riverine landscape diversity, beginning with an account the variety elements contained within river corridors. Landscape dynamics corridors are then examined in context evolution, ecological succession and turnover rates elements. followed by overview role connectivity ends perspective biodiversity. 2. River natural state characterised diverse array elements, including surface waters (a gradient lotic lentic waterbodies), fluvial stygoscape (alluvial aquifers), riparian systems forests, marshes, meadows) geomorphic features (bars islands, ridges swales, levees terraces, fans deltas, fringing floodplains, wood debris deposits channel networks). 3. Fluvial action (erosion, transport, deposition) predominant agent evolution also constitutes disturbance regime primarily responsible for sustaining high level diversity Although individual may exhibit turnover, largely function interactions between successional phenomena, their relative abundance corridor tends to remain constant over time. 4. Hydrological connectivity, exchange matter, energy biota via aqueous medium, plays major though poorly understood diversity. Rigorous investigations should provide considerable insight into landscape‐level functional processes. 5. The species pool landscapes derived from terrestrial aquatic communities inhabiting lotic, lentic, groundwater habitats arrayed across spatio‐temporal gradients. Natural regimes both expanding resource well constraining competitive exclusion. 6. Riverine ideal setting investigating how complex productivity structure patterns.

Language: Английский

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Hyporheic flow and transport processes: Mechanisms, models, and biogeochemical implications

Reviews of Geophysics, Journal Year: 2014, Volume and Issue: 52(4), P. 603 - 679

Published: Aug. 5, 2014

Fifty years of hyporheic zone research have shown the important role played by as an interface between groundwater and surface waters. However, it is only in last two decades that what began empirical science has become a mechanistic devoted to modeling studies complex fluid dynamical biogeochemical mechanisms occurring zone. These efforts led picture surface-subsurface water interactions regulators form function fluvial ecosystems. Rather than being isolated systems, bodies continuously interact with subsurface. Exploration processes new appreciation their wide reaching consequences for quality stream ecology. Modern aims toward unified approach, which are key elements appreciation, management, restoration whole river environment. In this unifying context, review summarizes results from field observations about flow transport describes theories proposed hydrology dynamics developed quantitatively model predict water, heat, dissolved suspended compounds sediment grain scale up watershed scale. The implications these biogeochemistry ecology also discussed.

Language: Английский

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Challenges to incorporating spatially and temporally explicit phenomena (hotspots and hot moments) in denitrification models

Biogeochemistry, Journal Year: 2009, Volume and Issue: 93(1-2), P. 49 - 77

Published: Jan. 7, 2009

Language: Английский

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Process-Based Ecological River Restoration: Visualizing Three-Dimensional Connectivity and Dynamic Vectors to Recover Lost Linkages

Ecology and Society, Journal Year: 2006, Volume and Issue: 11(2)

Published: Jan. 1, 2006

Kondolf, G. M., A. J. Boulton, S. O'Daniel, C. Poole, F. Rahel, E. H. Stanley, Wohl, Bång, Carlstrom, Cristoni, Huber, Koljonen, P. Louhi, and K. Nakamura 2006. Process-based ecological river restoration: visualizing three-dimensional connectivity dynamic vectors to recover lost linkages. Ecology Society 11(2): 5. https://doi.org/10.5751/ES-01747-110205

Language: Английский

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Reviews and syntheses: Effects of permafrost thaw on Arctic aquatic ecosystems

Biogeosciences, Journal Year: 2015, Volume and Issue: 12(23), P. 7129 - 7167

Published: Dec. 8, 2015

Abstract. The Arctic is a water-rich region, with freshwater systems covering about 16 % of the northern permafrost landscape. Permafrost thaw creates new ecosystems, while at same time modifying existing lakes, streams, and rivers that are impacted by thaw. Here, we describe current state knowledge regarding how affects lentic (still) lotic (moving) systems, exploring effects both thermokarst (thawing collapse ice-rich permafrost) deepening active layer (the surface soil thaws refreezes each year). Within thermokarst, further differentiate between in lowland areas vs. on hillslopes. For almost all processes explore, vary regionally, lake stream systems. Much this regional variation caused differences ground ice content, topography, type, coverage. Together, these factors determine (i) degree to which manifests as (ii) whether leads slumping or formation (iii) manner constituent delivery altered Differences thaw-enabled can be considerable, determining, for example, balance particulate dissolved constituents, inorganic organic materials. Changes composition thaw-impacted waters, coupled changes morphology, strongly affect physical optical properties lakes. ecology lakes streams also likely change; have unique microbiological communities, show respiration, primary production, food web structure largely driven sediment, matter, nutrient delivery. enables matter morphology stratification characteristics recipient will play an important role determining release greenhouse gases (CO2 CH4), its burial sediments, loss downstream. magnitude impacts aquatic ecosystems increasing, prevalence streams. There therefore urgent need quantify affecting across diverse landscapes, implications change climate warming.

Language: Английский

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The ecology of methane in streams and rivers: patterns, controls, and global significance

Ecological Monographs, Journal Year: 2016, Volume and Issue: 86(2), P. 146 - 171

Published: May 1, 2016

Abstract Streams and rivers can substantially modify organic carbon ( OC ) inputs from terrestrial landscapes, much of this processing is the result microbial respiration. While dioxide CO 2 major end‐product ecosystem respiration, methane CH 4 also present in many fluvial environments even though methanogenesis typically requires anoxic conditions that may be scarce these systems. Given recent recognition pervasiveness greenhouse gas streams rivers, we synthesized existing research data to identify patterns drivers 4, knowledge gaps, opportunities. This included examining history lotic research, creating a database concentrations fluxes (Meth DB generate global‐scale estimate efflux, developing conceptual framework using consider how human activities dynamics. Current understanding has been strongly influenced by goals quantifying contribution C fluxes. Less effort directed towards investigating processes dictate situ production loss. makes meager watershed or landscape budgets, but are often significant sources atmosphere across same spatial extents. Most systems supersaturated with an annual global emission 26.8 Tg , equivalent ~15‐40% wetland lake effluxes, respectively. clear role oxidation, methanogenesis, total anaerobic respiration whole Controls on generation persistence viewed terms proximate controls influence (organic matter, temperature, alternative electron acceptors, nutrients) distal geomorphic hydrologic drivers. Multiple combined its extreme redox status low solubility high temporal variance environments, which presents substantial challenge for larger‐scale Further consumption, metabolism, energetics achieved through more studies comparison terrestrial, wetland, aquatic disciplines.

Language: Английский

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A review of the consequences of decreased flow for instream habitat and macroinvertebrates

Journal of the North American Benthological Society, Journal Year: 2007, Volume and Issue: 26(3), P. 401 - 415

Published: July 23, 2007

The effects of drought on stream invertebrates have been reviewed, but the artificially reduced flows not. We addressed this knowledge gap by reviewing literature natural low and (without complete cessation flow). considered water volume habitat conditions invertebrate community structure, behavior, biotic interactions. Decreases in discharge usually cause decreased velocity, depth, wetted channel width; increased sedimentation; changes thermal regime chemistry. Invertebrate abundance increases or decreases response to flow, whereas richness commonly because diversity decreases. Invertebrates differ their environmental tolerances requirements, any loss area alteration food resources from flow can influence organism behavior drift often immediately after reduction, although some taxa are more responsive than others. Natural similar invertebrates, severity (duration magnitude) decrease responses. Certain especially sensitive might be useful indicators for restoration. effect streams is an important issue, few empirical studies impacts ecosystems done, manipulative experiments needed understand ecological consequences flow.

Language: Английский

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Geomorphology, hyporheic exchange, and selection of spawning habitat by bull trout (Salvelinus confluentus)

Canadian Journal of Fisheries and Aquatic Sciences, Journal Year: 2000, Volume and Issue: 57(7), P. 1470 - 1481

Published: July 1, 2000

The distribution and abundance of bull trout (Salvelinus confluentus) spawning were affected by geomorphology hyporheic groundwater - stream water exchange across multiple spatial scales in streams the Swan River basin, northwestern Montana. Among tributary streams, redds increased with area alluvial valley segments that longitudinally confined geomorphic knickpoints. all segment types, primarily found these bounded segments, which possessed complex patterns extensive upwelling zones. Bull used reaches for strongly influenced upwelling. However, within selected reaches, located transitional bedforms strong localized downwelling high intragravel flow rates. changing relationship habitat selection, zones at one scale another scale, emphasizes importance considering a hierarchical context when ecology this species or plans conservation restoration.

Language: Английский

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Integrative freshwater ecology and biodiversity conservation

Ecological Indicators, Journal Year: 2011, Volume and Issue: 11(6), P. 1507 - 1516

Published: May 18, 2011

Language: Английский

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