Quantifying cumulative stress acting on macroinvertebrate assemblages in lowland streams

The Science of The Total Environment, Journal Year: 2019, Volume and Issue: 694, P. 133630 - 133630

Published: July 27, 2019

Macroinvertebrates in lowland streams are exposed to multiple stressors from the surrounding environment. Yet, quantifying how these impact macroinvertebrate assemblages is challenging. The aim of this study was develop a novel method quantify cumulative stress acting on streams. To purpose, we considered 22 different stressor categories such as hydrological, morphological and chemical stressors, over spatial scales ranging instream catchment scale. Stressor intensity categorized into classes based assemblages. main stream divided segments, after which for each segment, contribution headwater catchments, riparian zone upstream calculated. validate quantification method, Tungelroyse Beek Netherlands used case study. For it shown that independently derived ecological quality scores samples collected at sites along decreased with increasing calculated scores, supporting design method. Based specific reasons absence presence species may be elucidated. Hence, help identify localize most stringent limiting assemblages, can thereby provide better focus management resources.

Language: Английский

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Microplastics and riverine macroinvertebrate communities in a multiple-stressor context: A mesocosm approach

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 951, P. 175456 - 175456

Published: Aug. 22, 2024

Growing use of synthetic materials has increased the number stressors that can degrade freshwater ecosystems. Many these are relatively new and poorly understood, such as microplastics which now ubiquitous in systems. The effects on biota must be investigated further order to better manage mitigate their impacts. Our experiment provides first empirical evaluation stream invertebrate community dynamics response different concentrations sizes, combination with fine sediment, a pervasive known stressor running waters. In 7-week streamside using 64 flow-through circular mesocosms, we exposure three simulated microplastic influxes (polyethylene microspheres at four levels between 0 28,800 items/event) addition sediment (to simulate polluted environment). Invertebrate drift was monitored for 48 h immediately after each influx, benthic communities were sampled 28 days manipulations. Microplastic concentration, size all had significant factor main several metrics, whereas few seen community. However, interactive common combinations suggesting multiple-stressor relationships sediment. ingestion witnessed 12 taxa analysed: Hydrobiosidae, Deleatidium spp., Potamopyrgus antipodarum Archichauliodes diversus. findings provide insights into how affect invertebrates field-realistic experimental setting highlight areas requiring study. These include investigations other types microplastics, role may play determining vulnerability pollution, framing more research context.

Language: Английский

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Effect of precipitation and sediment concentration on the loss of nitrogen and phosphorus in the Pasikhan River

Journal of Water Supply Research and Technology—AQUA, Journal Year: 2022, Volume and Issue: 71(2), P. 211 - 228

Published: Jan. 6, 2022

Abstract Natural and anthropogenic factors influence the entry of pollutants into surface waters their accumulation in aquatic ecosystems. This study aimed to investigate precipitation sediment concentration on outflow different forms phosphorus (P) nitrogen (N) three primary land-use types along Pasikhan River, biggest river entering Anzali Wetland Southern Caspian sea. Water sampling was performed a monthly basis during time bracket 2017–2018. Different P including total, soluble, particulate, total reactive, dissolved Kjeldahl N, soluble particulate were determined water samples. Total contents lay within range 2.2–4.7 from 0.14 0.33 mg l−1, respectively, downstream river. The highest watershed at Agriculture station recorded October. Substantial conformity found between trends trend precipitation. results indicated that load intensified after an increase rainfall rate, leading elevated N concentrations water, mainly as nitrogen. It can also be inferred result is directly related due rainfall. Increasing levels nutrients such River cause eutrophication Wetland, which needs conservative measures for reducing these elements' dynamic watershed.

Language: Английский

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Macroinvertebrate assemblages along a gradient of physicochemical characteristics in four riverine wetlands, Upper Blue Nile basin, Northwestern Ethiopia

Environmental Monitoring and Assessment, Journal Year: 2023, Volume and Issue: 195(6)

Published: May 5, 2023

Language: Английский

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An Estimated Structural Equation Model to Assess the Effects of Land Use on Water Quality and Benthic Macroinvertebrates in Streams of the Nam-Han River System, South Korea

International Journal of Environmental Research and Public Health, Journal Year: 2020, Volume and Issue: 17(6), P. 2116 - 2116

Published: March 23, 2020

The extent of anthropogenic land use in watersheds determines the amount pollutants discharged to streams. This indirectly and directly affects stream water quality biological health. Most studies have therefore focused on ways reduce non-point pollution sources streams from surrounding watersheds. However, mechanistic pathways between deterioration assemblages remain unclear. study estimated a structural equation model (SEM) representing impact agricultural urban benthic macroinvertebrate index (BMI) using IBM AMOS Nam-Han river systems, South Korea. SEM showed that percent significantly affected both BMI Specifically, higher had increased biochemical oxygen demand (BOD) total phosphorus (TP), deteriorated Similarly, proportions also BOD, nitrogen (TN), (TP) concentrations, lowered In addition, it was observed through BOD. we were not able observe any significant indirect effect nutrients including TN TP. These results indicate physicochemical characteristics communities Our findings emphasize need develop more elaborate environmental management restoration strategies improve status

Language: Английский

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