Ecosystem services provided by small streams: an overview

Hydrobiologia, Journal Year: 2022, Volume and Issue: 850(12-13), P. 2501 - 2535

Published: Nov. 29, 2022

Language: Английский

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Reviewing peatland forestry: Implications and mitigation measures for freshwater ecosystem browning

Forest Ecology and Management, Journal Year: 2023, Volume and Issue: 531, P. 120776 - 120776

Published: Jan. 13, 2023

Freshwaters of the boreal and temperate regions have experienced increased browning during last decades. Browning, or brownification, is mostly driven by organic carbon (OC) iron concentrations. It can cause detrimental changes in aquatic ecosystems through effects on chemistry, physics ecology. Additionally, impact greenhouse gas emissions, increase costs drinking water treatment weaken recreational value bodies. All these impacts call for means to mitigate excess export humic matter ecosystems. Browning has often been associated with decreased atmospheric sulphur deposition climate change-induced alterations temperature, vegetation hydrological regime catchments. Lately, it attributed land use, especially drainage peatlands forestry purposes afforestation. In this review, we evaluate peatland operations OC leaching assess possible mitigation measures. We reveal that traditional, even-aged forest management clear felling, site preparation ditch cleaning creates hot spots moments carbon-rich runoff due fluctuations hydrology, peat decomposition exposure. Simultaneously, most current protection measures are either ineffective ambiguous retaining OC, a dissolved form. Hence, practices prevent future reduce connectivity essential negative quality impacts. conclude systemic change would be needed formation loading leaching. More research needed, but seems transition towards more natural diverse abundantly applied continuous cover forestry, mixed improved catchment retention restoration could result fewer undesirable Protecting biodiversity counteracting requires integration updated into policies guidelines, as green shift bioeconomy will create an increasing demand sustainable use forests.

Language: Английский

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Plastic microfibers from household textile laundering: a critical review of their release and impact reduction

Critical Reviews in Environmental Science and Technology, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 25

Published: March 25, 2024

This review addresses the role of household washing machines in release plastic microfibers (MFs), and means to minimize emissions. Specifically, various strategies with potential mitigate MFs discharge are critically evaluated, such as modifying laundering conditions implementing point-of-use capturing systems. The currently available point-of use devices for removal associated technical limitations, obtaining a complete contaminants remains an open challenge. To allow safe wash water target impending regulations, should be user-friendly, compatible machines, easily maintainable, provide near MFs. Advantages, challenges thus discussed, possible improvement proposed. detection techniques also briefly presented this review, need standardization simplification is highlighted. Overall, efforts required promote wide approach toward environment-friendly textiles, including source control, encouraging biodegradable materials recycling, effective filtration treatment processes MFs, both at centralized plants.

Language: Английский

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Long‐term changes in dissolved inorganic carbon across boreal streams caused by altered hydrology

Limnology and Oceanography, Journal Year: 2022, Volume and Issue: 68(2), P. 409 - 423

Published: Dec. 1, 2022

Abstract A major challenge for predicting future landscape carbon (C) balances is to understand how environmental changes affect the transfer of C from soils surface waters. Here, we evaluated 14 yr (2006–2019) stream dissolved inorganic (DIC) concentration and export data nested boreal catchments that are subject climatic changes, compared long‐term patterns in DIC with organic (DOC). Few streams displayed significant or trends at annual time scales. However, most showed decreasing concentrations during spring flood over this 14‐yr period, about half declines summer. Although runoff has generally not changed an intra‐annual redistribution runoff, increases discharge, explained much seasonal concentration. We observed negative DIC–discharge relationships streams, suggesting source limitation DIC, whereas DOC mostly chemostatic behavior. The different vs. underpin composition total pool (i.e., DIC/DOC ratio) reflect fundamental differences these forms produced, stored riparian soils, mobilized by hydrological events. Collectively, our results highlight sensitivity riverine distribution but also important heterogeneity across network suggests local processes can modify mobilization landscapes.

Language: Английский

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Response of stream habitat and microbiomes to spruce budworm defoliation: New considerations for outbreak management

Ecological Applications, Journal Year: 2024, Volume and Issue: 34(7)

Published: Aug. 18, 2024

Abstract Defoliation by eastern spruce budworm is one of the most important natural disturbances in Canadian boreal and hemi‐boreal forests with annual area affected surpassing that fire harvest combined, its impacts are projected to increase frequency, severity, range under future climate scenarios. Deciding on an active management strategy control outbreaks minimize broader economic, ecological, social becoming increasingly important. These strategies differ degree which defoliation suppressed, but little known about downstream consequences and, thus, implications management. Given disproportionate role headwater streams their microbiomes net riverine productivity across forested landscapes, we investigated effects stream habitat microbiome structure function inform decisions. We experimentally manipulated a gradient among 12 watersheds during outbreak Gaspésie Peninsula, Québec, Canada. From May through October 2019–2021, (flow rates, dissolved organic matter [DOM], water chemistry, nutrients), algal biomass, temperatures were assessed. Bacterial fungal biofilm communities examined incubating six leaf packs for five weeks (mid‐August late September) reach per watershed. Microbiome community was determined using metabarcoding 16S ITS rRNA genes, functions extracellular enzyme assays, litter decomposition taxonomic functional assignments. found cumulative correlated increased streamflow rates temperatures, more aromatic DOM (measured as specific ultraviolet absorbance at 254 nm), not nutrient concentrations. Cumulative also associated altered microbial composition, carbohydrate biosynthesis, reduction compound degradation, suggesting microbes shifting preferential use simple carbohydrates rather than complex compounds. results demonstrate high levels can affect point altering ecosystem carbon cycling potential, highlighting importance incorporating ecological processes into

Language: Английский

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Two-stage channels can enhance local biodiversity in agricultural landscapes

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 356, P. 120620 - 120620

Published: March 23, 2024

Field drainage causes habitat loss, alters natural flow regimes, and impairs water quality. Still, ditches often are last remnants of aquatic wetland habitats in agricultural landscapes as such, can be important for local biodiversity. Two-stage channels considered a greener choice conventional ditches, they constructed to mimic the structure lowland streams providing channel mechanisms decrease diffuse loading. could also benefit biodiversity ecosystem functions, but existing information on their ecological benefits is scarce incomplete. We collected environmental biological data from six stream systems Finland each with consequent sections ditch two-stage study potential enhance riparian functions. Biological included samples invertebrates, diatoms plants beetles plants. Overall, both section types were highly dominated by few core taxa most studied organism groups. Riparian plant invertebrate communities seemed adjacent floodplains drier banks. In addition, had higher diversity, algal productivity, decomposition rate, lower diatom diversity. construction did not diversify which likely one explanation lack positive effects benthic However, harbored unique found only two all groups resulting gamma Thus, enhanced landscapes. Improvements especially might achieved increasing heterogeneity in-stream further efforts nutrient sediment loads.

Language: Английский

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Riparian buffers mitigate downstream effects of clear-cutting on instream metabolic rates

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 379, P. 124740 - 124740

Published: March 5, 2025

Language: Английский

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Resolving the Drivers of Algal Nutrient Limitation from Boreal to Arctic Lakes and Streams

Ecosystems, Journal Year: 2022, Volume and Issue: 25(8), P. 1682 - 1699

Published: April 7, 2022

Abstract Nutrient inputs to northern freshwaters are changing, potentially altering aquatic ecosystem functioning through effects on primary producers. Yet, while producer growth is sensitive nutrient supply, it also constrained by a suite of other factors, including light and temperature, which may play varying roles across stream lake habitats. Here, we use bioassay results from 89 lakes streams spanning boreal Arctic Sweden test for differences in limitation status algal biomass along gradients colored dissolved organic carbon (DOC), water concentrations, ask whether there distinct patterns drivers between Single nitrogen (N) or N-limitation with secondary phosphorus (P) was the most common condition lakes. Average response N-addition doubling biomass; however, degree modulated physical chemical conditions versus regions. Overall, responses were strongest at sites low background concentrations inorganic N. Low temperatures added nutrients but had weaker streams. Further, DOC mediated addition differently among Stream dampened higher DOC, whereas increased moderate depressed high DOC. Our suggest that future changes availability, particularly N, will exert strong trophic state freshwaters. However, highlight important factors shape availability different parts networks, ultimately affect integrated systems ongoing environmental changes.

Language: Английский

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Dark matters: Contrasting responses of stream biofilm to browning and loss of riparian shading

Global Change Biology, Journal Year: 2022, Volume and Issue: 28(17), P. 5159 - 5171

Published: May 28, 2022

Concentrations of terrestrial-derived dissolved organic carbon (DOC) in freshwater ecosystems have increased consistently, causing browning. The mechanisms behind browning are complex, but forestry-intensive regions is accelerated by land drainage. Forestry actions streamside riparian forests alter canopy shading, which together with expected to exert a complex and largely unpredictable control over key ecosystem functions. We conducted stream mesocosm experiment three levels (ambient vs. moderate high, 2.7 5.5-fold increase, respectively, absorbance) crossed two shading (70% light reduction open canopy) explore the individual combined effects loss on quantity (algal biomass) nutritional quality (polyunsaturated fatty acid sterol content) periphytic biofilm. also field survey differently colored (4.7 26.2 mg DOC L-1 ) streams provide 'reality check' for our experimental findings. Browning reduced greatly algal biomass, suppressed availability essential polyunsaturated acids, especially eicosapentaenoic (EPA), sterols, long-chain saturated acids (LSAFA). In contrast, primary productivity, resulted elevated EPA contents repeated same pattern: biofilm decreased significantly increasing DOC, as indicated particularly decrease ω-3:ω-6 ratio increase LSAFA content. Algal was mainly controlled inorganic nitrogen (DIN) concentration, while concentration minor importance. ongoing process inducing dramatic Such degradation major high-quality food source available consumers may reduce trophic transfer efficiency ecosystems, potentially extending across stream-forest ecotone.

Language: Английский

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Contrasting impacts of warming and browning on periphyton

Limnology and Oceanography Letters, Journal Year: 2023, Volume and Issue: 8(4), P. 628 - 638

Published: Feb. 27, 2023

Abstract We tested interactive effects of warming (+2°C) and browning on periphyton accrual pigment composition when grown a synthetic substrate (plastic strips) in the euphotic zone 16 experimental ponds. found that increased colored dissolved organic matter (cDOM) associated nutrients alone, or combination with warming, resulted substantially enhanced biomass periphyton, comparatively smaller increase phytoplankton. This illustrates is capable using cDOM, by this may affect nutrient availability for However, weakened positive impact accrual, possibly thermal compensation inferred from altered composition, and/or changes community composition. Our results illustrate multiple impacts climate change algal growth, which could have implications productivity consumer resource use, especially shallow areas northern lakes.

Language: Английский

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