Linkages between flow regime, biota, and ecosystem processes: Implications for river restoration

Science, Год журнала: 2019, Номер 365(6459)

Опубликована: Сен. 19, 2019

River ecosystems are highly biodiverse, influence global biogeochemical cycles, and provide valued services. However, humans increasingly degrading fluvial by altering their streamflows. Effective river restoration requires advancing our mechanistic understanding of how flow regimes affect biota ecosystem processes. Here, we review emerging advances in hydroecology relevant to this goal. Spatiotemporal variation exerts direct indirect control on the composition, structure, dynamics communities at local regional scales. Streamflows also processes, such as nutrient uptake transformation, organic matter processing, metabolism. We deepening biological not just static patterns, affected stream research nexus flow-biota-ecosystem processes is an early stage. illustrate frontier with evidence from altered regulated rivers urban streams. identify challenges that should be prioritized advance process-based restoration.

Язык: Английский

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Integrated water availability in the conterminous United States, 2010–20

USGS professional paper, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Язык: Английский

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Common insecticide disrupts aquatic communities: A mesocosm-to-field ecological risk assessment of fipronil and its degradates in U.S. streams

Science Advances, Год журнала: 2020, Номер 6(43)

Опубликована: Окт. 23, 2020

Study shows that a common insecticide frequently detected in U.S. streams is more toxic than previously thought.

Язык: Английский

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Multiple lines of evidence point to pesticides as stressors affecting invertebrate communities in small streams in five United States regions

The Science of The Total Environment, Год журнала: 2024, Номер 915, С. 169634 - 169634

Опубликована: Янв. 24, 2024

Multistressor studies were performed in five regions of the United States to assess role pesticides as stressors affecting invertebrate communities wadable streams. Pesticides and other chemical physical measured 75 99 streams per region for 4 weeks, after which surveyed (435 total sites). sampled weekly filtered water, once bed sediment. The a stressor was assessed by evaluating multiple lines evidence: toxicity predictions based on pesticide concentrations, multivariate models statistical analyses, previously published mesocosm experiments. Toxicity using benchmarks species sensitivity distributions correlations suggested that present at high enough concentrations adversely affect regional scale. Two undirected techniques—boosted regression tree distance-based linear models—identified predictors (respectively) metrics community composition. To put insecticides context with known, influential covariates response, generalized additive used identify individual pesticide(s) important condition each region, accounting natural covariates. Four identified scale: bifenthrin, chlordane, fipronil its degradates, imidacloprid. Fipronil particularly Southeast imidacloprid, chlordane regions. For fipronil, supported experiments demonstrated adverse effects naïve aquatic when dosed under controlled conditions. These evidence do not prove causality—which is challenging field multistressor conditions—but they make strong case within

Язык: Английский

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Undesirable river biofilms: The composition, environmental drivers, and occurrence of sewage fungus

Ecological Indicators, Год журнала: 2024, Номер 161, С. 111949 - 111949

Опубликована: Март 28, 2024

Sewage fungus is a classic bioindicator of organic pollution in streams and rivers. However, it has received limited scientific interest recent decades, despite persistent occurrence lotic ecosystems. The aim this review to provide an up-to-date assessment sewage fungus, its composition structure, the environmental factors that influence growth support future research mitigation interventions. We advocate for term "undesirable river biofilm" (URB) more accurately characterise composition, location, consequences fungus. These filamentous or gelatinous growths found on banks beds flowing watercourses are composed predominantly bacteria, not fungi. Based modern genomic analyses, we now know URBs diversity microbial taxa, including those have long been associated with (e.g. Sphaerotilus, Beggiatoa, Zoogloea) newer taxa Rhodoferax Thiothrix). While generally considered main trigger, highlights importance other factors, such as water velocity, substrate, pollutant loading, shading, persistence URBs. To illustrate widespread continued presence rivers, surveillance data England's rivers were analysed. Between 2000 2020, environment officers documented 6,025 occurrences part wider quality incident reporting programme. Thus, persist even countries stringent standards comprehensive wastewater infrastructure, suggesting they may continue be significant issue globally, public focus. argue addition tackling point discharge pollutants, greater emphasis should placed understanding impact intermittent diffuse altered conditions safeguard ecosystems, holistic approach needed considers combination functioning hydrology, geomorphology, biogeochemical processing, riparian zones) climate change. Future areas study into URB phenomenon suggested, monitoring specifically biofilm health generally.

Язык: Английский

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Daily stream samples reveal highly complex pesticide occurrence and potential toxicity to aquatic life

The Science of The Total Environment, Год журнала: 2020, Номер 715, С. 136795 - 136795

Опубликована: Янв. 18, 2020

Язык: Английский

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Lessons learned from 20 y of monitoring suburban development with distributed stormwater management in Clarksburg, Maryland, USA

Freshwater Science, Год журнала: 2022, Номер 41(3), С. 459 - 476

Опубликована: Фев. 2, 2022

Urban development is a well-known stressor for stream ecosystems, presenting challenge to managers tasked with mitigating its effects. For the past 20 y, streamflow, water quality, geomorphology, and benthic communities were monitored in 5 watersheds Montgomery County, Maryland, USA. This study presents synthesis of multiple studies monitoring efforts area new analysis more recent data document primary lessons learned from monitoring. The include forested control, an urban control centralized stormwater management, 3 suburban treatment featuring low-impact high density infiltration-focused facilities distributed across watershed. Treatment before development, during construction, after development. Monitoring was initiated inform adaptive management impervious cover limits within area, focus on impacts management. Results our indicate that advantageous compared numerous ways. Hydrologic benefits greater infrastructure, demonstrating ability mitigate runoff volumes peak flows and, small storms, replicate predevelopment conditions. Baseflow temporarily increased construction phase watersheds. Water-quality mixed, declines baseflow nitrate concentrations but limited changes export increases specific conductance Substantial topographic occurred watersheds, including riparian zone, despite buffer protections. Ecological indicated even though index biotic integrity scores rebounded some cases, sensitive macroinvertebrate families did not fully recover Lessons this highlight importance tracking indicators health considering land use watershed beneficial cannot effects all stressors aquatic ecosystems.

Язык: Английский

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Multiple in-stream stressors degrade biological assemblages in five U.S. regions

The Science of The Total Environment, Год журнала: 2021, Номер 800, С. 149350 - 149350

Опубликована: Июль 31, 2021

Язык: Английский

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Effects of multiple stressors on benthic invertebrates using Water Framework Directive monitoring data

The Science of The Total Environment, Год журнала: 2023, Номер 878, С. 162952 - 162952

Опубликована: Март 21, 2023

Язык: Английский

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Water quality deterioration remains a major stressor for macroinvertebrate, diatom and fish communities in German rivers

The Science of The Total Environment, Год журнала: 2023, Номер 907, С. 167994 - 167994

Опубликована: Окт. 22, 2023

About 60 % of Europe's rivers fail to meet ecological quality standards derived from biological criteria. The causes are manifold, but recent reports suggest a dominant role hydro-morphological and water quality-related stressors. Yet, in particular micropollutants hydrological stressors often tend be underrepresented multiple-stressor studies. Using monitoring data four Federal States Germany, this study investigated the effects 19 stressor variables six groups (nutrients, salt ions, dissolved oxygen/water temperature, mixture toxicity 51 micropollutants, alteration morphological habitat quality) on three assemblages (fishes, macroinvertebrates, benthic diatoms). Biological were analyzed for 35 community metrics quantified using Random Forest (RF) analyses put into hierarchical context. To compare metric responses, grouped categories reflecting important characteristics communities, such as sensitivity, functional traits, diversity composition well composite indices that integrate several one single index (e.g., class). Water - not turned out dominate responses all assemblages. In contrast, less pronounced stronger than Explained variances RF models ranged 23-64 16-40 diatoms 18-48 fishes. Despite high variability across groups, sensitivity tended reveal individual higher explained variance indices. results (physico-chemical) deterioration continues impact many German rivers, despite extensive progress wastewater treatment during past decades. detect deterioration, schemes need target relevant physico-chemical micropollutants. Furthermore, needs measures flow magnitude dynamics). At present, surveys rarely address degree alteration. order achieve good status, river restoration management both Restricting just organism group macroinvertebrates) or only selected class) may hamper identification its classification and, thus mislead management.

Язык: Английский

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