Global prevalence of non-perennial rivers and streams

Nature, Год журнала: 2021, Номер 594(7863), С. 391 - 397

Опубликована: Июнь 16, 2021

Язык: Английский

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Pervasive changes in stream intermittency across the United States

Environmental Research Letters, Год журнала: 2021, Номер 16(8), С. 084033 - 084033

Опубликована: Июль 29, 2021

Abstract Non-perennial streams are widespread, critical to ecosystems and society, the subject of ongoing policy debate. Prior large-scale research on stream intermittency has been based long-term averages, generally using annually aggregated data characterize a highly variable process. As result, it is not well understood if, how, or why hydrology non-perennial changing. Here, we investigate trends drivers three signatures that describe duration, timing, dry-down period across continental United States (CONUS). Half gages exhibited significant trend through time in at least one signatures, changes no-flow duration were most pervasive (41% gages). Changes substantial for many streams, 7% annual exceeding 100 days during study period. Distinct regional patterns change evident, with widespread drying southern CONUS wetting northern CONUS. These correlated aridity, though spatiotemporal variability diverse signatures. While timing strongly related climate, was watershed land use physiography. Our results indicate conditions increasing prevalence over much binary classifications ‘perennial’ ‘non-perennial’ an accurate reflection this change. Water management should reflect changing nature both today future.

Язык: Английский

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Intermittent rivers and ephemeral streams: Perspectives for critical zone science and research on socio‐ecosystems

Wiley Interdisciplinary Reviews Water, Год журнала: 2021, Номер 8(4)

Опубликована: Май 4, 2021

Abstract Intermittent rivers and ephemeral streams (IRES) are now recognized to support specific freshwater biodiversity ecosystem services represent approximately half of the global river network, a fraction that is likely increase in context changes. Despite large research efforts on IRES during past few decades, there need for developing systemic approach considers their hydrological, hydrogeological, hydraulic, ecological, biogeochemical properties processes, as well interactions with human societies. Thus, we assert interdisciplinary promoted by critical zone sciences socio‐ecology relevant. These approaches rely infrastructure—Critical Zone Observatories (CZO) Long‐Term Socio‐Ecological Research (LTSER) platforms—that representative diversity (e.g., among climates or types geology. We illustrate this within French CZO LTSER, including socio‐ecosystems, detail IRES. networks also specialized long‐term observations required detect measure responses climate forcings despite delay buffering effects ecosystems. The LTSER platforms development innovative techniques data analysis methods can improve characterization IRES, particular monitoring flow regimes, groundwater‐surface water flow, biogeochemistry rewetting. provide scientific methodological perspectives which its associated infrastructure would relevant original insights help fill knowledge gaps about This article categorized under: Water Life > Stresses Pressures Ecosystems Science Hydrological Processes Conservation, Management, Awareness

Язык: Английский

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Causes, Responses, and Implications of Anthropogenic versus Natural Flow Intermittence in River Networks

BioScience, Год журнала: 2022, Номер 73(1), С. 9 - 22

Опубликована: Дек. 7, 2022

Abstract Rivers that do not flow year-round are the predominant type of running waters on Earth. Despite a burgeoning literature natural intermittence (NFI), knowledge about hydrological causes and ecological effects human-induced, anthropogenic (AFI) remains limited. NFI AFI could generate contrasting biological responses in rivers because distinct underlying drying evolutionary adaptations their biota. We first review show how different drivers alter timing, frequency duration drying, compared with NFI. Second, we evaluate possible differences biodiversity responses, functions, ecosystem services between AFI. Last, outline gaps management needs related to Because hydrologic characteristics impacts AFI, ignoring distinction undermine intermittent ephemeral streams exacerbate risks ecosystems societies downstream.

Язык: Английский

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The Drying Regimes of Non‐Perennial Rivers and Streams

Geophysical Research Letters, Год журнала: 2021, Номер 48(14)

Опубликована: Июль 1, 2021

Abstract The flow regime paradigm is central to the aquatic sciences, where drives critical functions in lotic systems. Non‐perennial streams comprise majority of global river length, thus we extended this stream drying. Using 894 USGS gages, isolated 25,207 drying events from 1979 2018, represented by a streamflow peak followed no flow. We calculated hydrologic signatures for each event and using multivariate statistics, grouped into regimes characterized by: (a) fast drying, (b) long no‐flow duration, (c) prolonged following low antecedent flows, (d) without distinctive signature. 77% gages had more than one at different times within study period. Random forests revealed land cover/use are important how dries climate or physiographic characteristics. Clustering behavior may allow practitioners systematically adapt water resource management practices specific rivers.

Язык: Английский

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Towards an improved understanding of biogeochemical processes across surface-groundwater interactions in intermittent rivers and ephemeral streams

Earth-Science Reviews, Год журнала: 2021, Номер 220, С. 103724 - 103724

Опубликована: Июнь 25, 2021

Surface-groundwater interactions in intermittent rivers and ephemeral streams (IRES), waterways which do not flow year-round, are spatially temporally dynamic because of alternations between flowing, non-flowing dry hydrological states. Interactions surface groundwater often create mixing zones with distinct redox gradients, potentially driving high rates carbon nutrient cycling. Yet a complete understanding how underlying biogeochemical processes across surface-groundwater flowpaths IRES differ among various states remains elusive. Here, we present conceptual framework relating spatial temporal variability water-groundwater to processing hotspots IRES. We combine review theIRES biogeochemistry literature concepts hydrogeomorphology to: (i) outline common distinctions IRES; (ii) use these distinctions, together considerations carbon, nitrogen, phosphorus cycles within IRES, predict the relative potential for different reach-scale (flowing water, fragmented pools, hyporheic zones, groundwater, emerged sediments); (iii) explore entire networks. Our approach estimates greatest when reaches into isolated water highlights relatively understudied such as sediments. Furthermore, fluvial networks dominated by is likely more than variable. conclude that research would benefit from focusing on cycles, states, consideration network architecture. outlines opportunities advance studies expand

Язык: Английский

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Meta‐ecosystem dynamics drive the spatial distribution of functional groups in river networks

Oikos, Год журнала: 2022, Номер 2022(11)

Опубликована: Сен. 19, 2022

The meta‐ecosystem concept provides a theoretical framework to study the effect of local and regional flows resources on ecosystem dynamics. Meta‐ecosystem theory has hitherto been applied highly abstract landscapes, dynamics in real‐world landscapes remain largely unexplored. River networks constitute prime example meta‐ecosystems, being characterized by directional resource from upstream downstream communities between terrestrial aquatic realm. These have thoroughly described continuum (RCC), seminal freshwater ecology, stating that observed spatial variations relative abundances invertebrate functional groups reflect systematic shifts types locations food resources, which are turn determined physical attributes river reaches. Hence, RCC represents solid conceptual basis for determining how changes landscape structure will translate into community composition. Here, we develop analyse riverine model inspired RCC, builds upon physically‐based dendritic networks. We show distributions biomass stream scaling networks, as well specific rates flows. Neglecting any these aspects modelling meta‐ecosystems would result different patterns. Moreover, high flow, due anthropization, negative all studied, can lead cascading extinctions at scale. Our work paves way development models understand functioning ecosystems.

Язык: Английский

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Rethinking ecosystem service indicators for their application to intermittent rivers

Ecological Indicators, Год журнала: 2022, Номер 137, С. 108693 - 108693

Опубликована: Март 5, 2022

In these times of strong pressure on aquatic ecosystems and water resources due to climate change abstraction, intermittent rivers ephemeral streams (IRES) (rivers that periodically cease flow and/or dry) have become valuable assets. Indeed, not only do they supply but also offer services for humanity. Despite a growing recognition towards IRES, information assessing their ecosystem (ES) remains scarce. first step, an international interdisciplinary group researchers developed methodological framework acknowledge ES provided by IRES using 109 indicators. A subset selected indicators was then applied two case studies: the Rio Seco in Algarve (Portugal) Giofyros River Crete (Greece). This paper discusses applicability indicators, including temporal spatial variability regimes. Aspects framework, such as methods time required data collection, nature (demand or supply) functionality each indicator are discussed. The new accounts intermittence analyses can help scientists managers i) increase ease justification use management approaches ii) improve conservation restoration with comprehensive set appropriate IRES. addition, proposed ensures be understood broad audience easily applicable. Since were designed through public participation process, setting has been prepared holistic stakeholder analysis education around functions associated ES. From point view, it would particularly relevant perform economic evaluation this understand value category trade-offs. For scientific community, however, is important consider preferences design socially accepted policies. successfully bridge elements, hereby establishing solid basis assessment

Язык: Английский

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Unveiling the hidden dynamics of intermittent surface water: A remote sensing framework

Remote Sensing of Environment, Год журнала: 2024, Номер 311, С. 114285 - 114285

Опубликована: Июнь 27, 2024

Язык: Английский

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Integrating Discharge‐Concentration Dynamics Across Carbon Forms in a Boreal Landscape

Water Resources Research, Год журнала: 2021, Номер 57(8)

Опубликована: Авг. 1, 2021

Abstract The flux of terrestrial carbon across land‐water boundaries influences the overall balance landscapes and ecology biogeochemistry aquatic ecosystems. local consequences broader fate delivered to streams is determined by composition inputs, including organic inorganic forms. Yet, our understanding how hydrologic fluxes different interfaces regulate supply remains poor. We used 7 years data from three boreal catchments test (i.e., forest, wetland, lake) modulate concentration‐discharge (C‐Q) relationships for dissolved (DOC), dioxide (CO 2 ), methane, as well among forms (e.g., DOC:CO ). Seasonal patterns in concentrations C‐Q individual differed catchments. DOC varied between chemostasis transport limitation forest catchment, wetland was persistently chemostatic lake outlet stream. Carbon gases were limited overall, but exhibited or linked elevated flow summer autumn. Unique reflected properties underpinned changes lateral supply. Accordingly, dominated during snowmelt, whereas gas evasion increased relative importance other times year. Integrating dynamics provides insight into shifting export, thus helps predict may alter supplied streams.

Язык: Английский

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