Identifying Functional Flow Linkages Between Stream Alteration and Biological Stream Condition Indices Across California DOI Creative Commons
Ryan A. Peek, Katie Irving, Sarah M. Yarnell

et al.

Frontiers in Environmental Science, Journal Year: 2022, Volume and Issue: 9

Published: Jan. 4, 2022

Large state or regional environmental flow programs, such as the one based on California Environmental Flows Framework, rely broadly applicable relationships between and ecology to inform management decisions. California, despite having high bioassessment data density, has not established specific elements of annual hydrograph biological stream condition. To address this, we spatially temporally linked USGS gage stations assessment sites in identify suitable paired for comparisons streamflow alteration with condition at a statewide scale. were assessed using set functional metrics that provide comprehensive way compare seasonal variation across different locations. Biological response was evaluated Stream Condition Index (CSCI) Algal (ASCI), which quantify conditions by translating benthic invertebrate algal resources watershed-scale into an overall measure health. These indices consistent standard interpreting data, thus, means quantitatively comparing throughout state. The results indicate most closely associated seasonality timing metrics, fall pulse timing, dry-season wet season timing. Magnitude baseflow, magnitude also important influencing conditions. Development ecological needs large-scale programs should consider any components (e.g., flow, wet-season spring recession flow) may be restructuring communities.

Language: Английский

The natural flow regime: A master variable for maintaining river ecosystem health DOI
Mohd Sharjeel Sofi, Sami Ullah Bhat, Irfan Rashid

et al.

Ecohydrology, Journal Year: 2020, Volume and Issue: 13(8)

Published: Aug. 28, 2020

Abstract River health is sustained by time‐based variation in their flows, and the maintenance of natural flow regime essential for keeping rivers healthy. However, dynamism now stands altered changing climate, omnipresent regulation river flows throughout world has severely impacted health. It well documented that harnessing altering streams comes at a huge cost. Numerous have stopped supporting socially economically important native species or sustain vibrant ecosystems offer valuable goods services. The alteration led to collapse many healthy resilient world. Therefore, ensure appropriate naturalized regimes riverine organisms sustainable nexus between energy demand, water requirements more understanding required study consequences triggered climate change anthropogenic interventions. Moreover, conservation management practices must be firmly based on scientific principles restore integrity ecosystems. current approaches often fail take into consideration basic fundamental principle ecosystem largely determined dynamic character regimes. In this synthesis, we try explain how an requirement maintaining

Language: Английский

Citations

76
Environmental Flow Requirements of Estuaries: Providing Resilience to Current and Future Climate and Direct Anthropogenic Changes DOI Creative Commons
Daniel Chilton, David P. Hamilton, Ivan Nagelkerken

et al.

Frontiers in Environmental Science, Journal Year: 2021, Volume and Issue: 9

Published: Nov. 17, 2021

Estuaries host unique biodiversity and deliver a range of ecosystem services at the interface between catchment ocean. They are also among most degraded ecosystems on Earth. Freshwater flow regimes drive ecological processes contributing to their economic value, but have been modified extensively in many systems by upstream water use. Knowledge freshwater requirements for estuaries (environmental flows or E-flows) lags behind that rivers floodplains. Generalising estuarine E-flows is further complicated responses appear be specific each system. Here we critically review E-flow 1) identify key (hydrodynamics, salinity regulation, sediment dynamics, nutrient cycling trophic transfer, connectivity) modulated regimes, 2) drivers (rainfall, runoff, temperature, sea level rise direct anthropogenic) generate changes magnitude, quality timing flows, 3) propose mitigation strategies (e.g., modification dam operations habitat restoration) buffer against risks altered build resilience indirect anthropogenic disturbances. These support re-establishment natural characteristics which foundational healthy ecosystems.

Language: Английский

Citations

72
Scaling from global to regional river flow with global hydrological models: Choice matters DOI
Tongbi Tu, Jiahao Wang, Gang Zhao

et al.

Journal of Hydrology, Journal Year: 2024, Volume and Issue: 633, P. 130960 - 130960

Published: Feb. 25, 2024

Language: Английский

Citations

9
The ecological benefits of more room for rivers DOI
Christina L. McCabe, Christoph D. Matthaei, Jonathan D. Tonkin

et al.

Nature Water, Journal Year: 2025, Volume and Issue: unknown

Published: March 21, 2025

Language: Английский

Citations

1
Drought effects on invertebrate metapopulation dynamics and quasi‐extinction risk in an intermittent river network DOI Creative Commons
Romain Sarremejane, Rachel Stubbington, Judy England

et al.

Global Change Biology, Journal Year: 2021, Volume and Issue: 27(17), P. 4024 - 4039

Published: May 25, 2021

Abstract Ecological communities can remain stable in the face of disturbance if their constituent species have different resistance and resilience strategies. In turn, local stability scales up regionally heterogeneous landscapes maintain spatial asynchrony across discrete populations—but not large‐scale stressors synchronize environmental conditions biological responses. Here, we hypothesized that droughts could drastically decrease invertebrate metapopulations both by filtering out poorly adapted locally, synchronizing dynamics a river network. We tested this hypothesis via multivariate autoregressive state‐space (MARSS) models on spatially replicated, long‐term data describing aquatic hydrological set temperate, lowland streams subject to seasonal supraseasonal drying events. This quantitative approach allowed us assess influence (flow magnitude) network‐scale (hydrological connectivity) drivers trajectories, simulate near‐future responses range drought scenarios. found fluctuations abundances were driven combination stochastic drivers. Among metapopulations, increasing extent dry reaches reduced abundance functional groups with low or capacities (i.e. ability persist situ recolonize from elsewhere, respectively). Our simulations revealed metapopulation quasi‐extinction risk for taxa vulnerable increased exponentially as flowing habitats contracted within network, whereas traits remained stable. results suggest be agent riverscapes, potentially leading regional lower abilities. Better recognition drought‐driven synchronization may increase realism extinction forecasts hydroclimatic extremes continue intensify worldwide.

Language: Английский

Citations

42
A roadmap for the conservation of freshwater mussels in Europe DOI Creative Commons
Ronaldo Sousa, Tadeusz Zając, Dariusz Halabowski

et al.

Conservation Biology, Journal Year: 2022, Volume and Issue: 37(2)

Published: Sept. 1, 2022

Europe has a long history of human pressure on freshwater ecosystems. As continues to grow and new threats emerge, there is an urgent need for conservation biodiversity its ecosystem services. However, whilst some taxonomic groups, mainly vertebrates, have received disproportionate amount attention funds, other groups remain largely off the public scientific radar. Freshwater mussels (Bivalvia, Unionida) are alarming example this bias here we point out six conceptual areas that immediate long-term attention: knowledge, threats, socioeconomics, conservation, governance education. The proposed roadmap aims advance research, policy education by identifying most pressing priorities short- across Europe.

Language: Английский

Citations

37
Ecosystem-size relationships of river populations and communities DOI
Angus R. McIntosh, Hamish S. Greig, Helen J. Warburton

et al.

Trends in Ecology & Evolution, Journal Year: 2024, Volume and Issue: 39(6), P. 571 - 584

Published: Feb. 21, 2024

Language: Английский

Citations

7
Flow and thermal regimes altered by a dam caused failure of fish recruitment in the upper Mekong River DOI
Chengzhi Ding, Jie Sun,

Minrui Huang

et al.

Freshwater Biology, Journal Year: 2023, Volume and Issue: 68(8), P. 1319 - 1329

Published: May 10, 2023

Abstract Riverine fishes have been increasingly threatened by the global proliferation of both small dams and large hydropower projects to meet soaring water, energy food demands from growing human populations urbanisation. However, empirical evidence direct effects on a specific species before after dam construction operation is rare. Causes population decline vary among and, although little known, they are great importance for successful environmental flow regulation. We monitored hydroenvironment dynamics Schizothoracinae fish ( Schizothorax lissolabiatus ) 9 years (i.e., Dahuaqiao) in upper Mekong River understand response processes underlying mechanisms. Optimal hydroenvironmental conditions key reproduction stages (e.g., pre‐spawning, hatching post‐hatching) were reconstructed using daily increment analysis larval otoliths data. The regime was substantially disrupted dam, water temperature only slightly changed. disappearance young year downstream indicates that changed caused recruitment failure S. . By matching optimal with data series operation, we found changes thermal alone narrowing window an average 41%, whereas flow‐regime change narrowed it 96% 98% combined. This study shows altered regime, but not primary driver findings highlight prioritising management improve success favour persistence other imperilled native dammed rivers.

Language: Английский

Citations

14
Flow Matters: Unravelling the Interactive Influences of Flow Variation and Non‐Native Trout on Vulnerable Galaxiids DOI Creative Commons

Olivia R. Hore,

Jonathan D. Tonkin, Nixie C. Boddy

et al.

River Research and Applications, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

ABSTRACT Understanding the interactive effects of non‐native species and alterations to flow regimes is important combat threats freshwater communities. Low‐flow conditions may either exacerbate or offset influences non‐natives but mechanisms determining direction are poorly understood. We evaluated how stream drying affected interactions between vulnerable native stream‐resident galaxiids trout in Aotearoa, New Zealand. electrofished (December–March) paired perennial reaches containing ( Galaxias vulgaris G. paucispondylus ) compare abundance growth rates streams with high n = 2), low 2) no brown 3; Salmo trutta ). Low flows greatly reduced size, likely reducing predatory since risk size‐related. Galaxiid densities were consistently lower compared troutless streams. However, less by than trout, setting scene for an interaction flow. In numbers galaxiid very reaches, whereas they moderate reaches. That meant increased a decreasing many indirect positive effect, although their never reached levels trout‐free low‐density streams, there clear differences different types. Thus, on depended regime, driven harsh low‐flow suppressing large which more sensitive galaxiids. actually conspecific decreased increasing advantages presence possibly helped drive these populations potentially via attractive sink‐type mechanism. Overall, have indirectly bolstered natives, natives also suppressed Such reduction common appear controlled relative vulnerability size‐structured will be key balancing maintenance natural minimising sports fish. Flow depletion might create some refuge fishes non‐native, net could still worse as we observed. it ascertain flow‐depleted affect long‐term persistence fish before relaying suppress non‐natives.

Language: Английский

Citations

0
Development of an eco-hydrological distance index and improved environmental flow assessment by integrating ecological monitoring and hydrological modeling DOI Creative Commons
Chiara Arrighi, Marco De Simone,

Gaia Checcucci

et al.

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 969, P. 178961 - 178961

Published: Feb. 27, 2025

Achieving a good ecological status for rivers is primary goal under European water protection legislation, and establishing suitable environmental flows (e-flows) key to reach this objective. Typically, statistical hydrologic methods are used determine e-flows at the river basin district scale; however, these often overlook quality critical flow-ecology relationships, i.e., models linking streamflow responses. This study integrates monitoring data with address limitations of hydrological e-flow assessment. The new method developed in enables more precise definition thresholds development an eco-hydrological distance index (EHDI). EHDI indicates how closely river's flow aligns targets, taking into account catchment pressures. methodology involves: (i) balance simulation using distributed model that accounts human impacts, (ii) regression establish bad based on monitored data, (iii) EHDI, which compares actual identify where further abstraction should be restricted. application across 11,000 reaches Tuscany, (Italy) reveals many approach threshold summer. Instead only few deviate significantly from targets according mean annual flow. findings underscore statistical-hydrologic alone fail capture complex dynamics between regimes status, especially high pressure. In fact, when pressures significant, restoration natural would not enough achieve objectives.

Language: Английский

Citations

0