Tracking freshwater browning and coastal water darkening from boreal forests to the Arctic Ocean

Limnology and Oceanography Letters, Год журнала: 2023, Номер 8(4), С. 611 - 619

Опубликована: Март 13, 2023

Abstract The forest cover of Northern Europe has been steadily expanding during the last 120 years. More terrestrial vegetation and carbon fixation leads to more export surface waters. This may cause freshwater browning, as degraded plant‐litter ends up chromophoric (colored) dissolved organic matter. Although most ultimately drains coastal waters, link between browning water darkening is poorly understood. Here, we explore this relationship through a combination centennial records clarity, contemporary optical measurements in lakes well an ocean drift model. We suggest clarity Baltic, Kattegat, Skagerrak Sea show how brown‐colored from European catchments can dictate across thousands kilometers, Baltic Barents Sea.

Язык: Английский

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Browning from headwaters to coastal areas in the boreal region: Trends and drivers

The Science of The Total Environment, Год журнала: 2024, Номер 927, С. 171959 - 171959

Опубликована: Март 25, 2024

Browning of freshwaters, mainly caused by increased terrestrial organic carbon loading, has been widely studied during the last decades. However, there are still uncertainties regarding both extent browning in different aquatic ecosystems and actual importance driving forces mechanisms. To refine understanding causes its temporal variation, we gathered a comprehensive dataset including 746 Finnish water quality monitoring stations representing various waterbody types: streams, rivers, lakes, coastal waters. Monotonic trend analyses revealed that TOC concentrations all types study period from 1990 to 2020, whereas non-linear trends indicated upward have substantially decreased since mid-2000s. despite levelling off, also decreases at only few stations. As result, contents majority 2020 were higher level than 1990. examine increasing concentrations, selected 100 riverine catchments linked detected 24 drivers, hydrometeorological catchment characteristics. The surface waters could be connected diverse human impacts: variables impacted climate change, acidic deposition, land use terms peatland drainage. temperatures was emphasized, role as driver leaching forthcoming years is expected grow with change.

Язык: Английский

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Evaluating land use impacts on water quality: perspectives for watershed management

Sustainable Water Resources Management, Год журнала: 2023, Номер 9(6)

Опубликована: Ноя. 22, 2023

Abstract Human activities threaten the integrity of watersheds. We aimed to investigate impact land use on water quality, adopting a multiscale approach. collected samples from twelve streams in Southern Brazil and conducted limnological analyses (physical, chemical, biological) during dry season. used quality index based standards Canada Brazil. Land percentage was measured two groups (local scale network scale). Environmental variables were summarized through Principal Component Analysis, we organized them into Linear Models, integrating classes terrain slope Multifit formula. Statistical performed using R software. Results indicated contamination by lead, chromium, copper, nitrogen, Escherichia coli samples. The Canadian Water Quality Guidelines for Protection Aquatic Life resulted an ranging 23.3 47.3, compared Brazilian Resolution No. 357/2005 Class 2, which had 47.5 100. This disparity is attributed more rigorous sensitive monitoring approach adopted guidelines. Riparian forests are up 50 m wide associated with improved quality. Agricultural urban main contributors degradation area extending 1000 watershed. emphasize importance watershed management public policies, considering not only riparian forest preservation, but also human throughout It crucial prioritize science-based environmental policies strengthen enforcement prevent increasingly pronounced collapses. have identified urgency reformulate CONAMA conservationist ecosystem-oriented approach, as well propose modifications Forest Code, particularly regarding buffer zones permanent preservation areas. Thus, this study can provide insights, such incorporating “effect scale,” enhance resource landscapes heavily influenced action, contributing advancement future research freshwater ecosystems.

Язык: Английский

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Linking sediment geochemistry with catchment processes, internal phosphorus loading and lake water quality

Water Research, Год журнала: 2024, Номер 263, С. 122157 - 122157

Опубликована: Июль 26, 2024

Research in the field of sediment geochemistry suggests potential linkages between catchment processes (land use), internal phosphorus (P) loading and lake water quality, but evidence is still poorly quantified due to a limited amount data. Here we address issues based on comprehensive data set from 27 lakes southern Finland. Specifically, aimed at: 1) elucidating factors behind spatial variations geochemistry; 2) assessing impact diagenetic transformation P regeneration across changes vertical distribution components; 3) exploring role forms (IL), 4) determining IL quality. The relationship concentration area percentage (FA%) was statistically significant (mainly eutrophic) with catchments that included more than 10 % fields. We found iron-bound (Fe-P) increased increasing FA%, which agrees high expected losses cultivated areas. Additionally, populated areas pool Fe-P. Internal significantly positively related both Fe-P organic (Org-P). However, Org-P not (as third predictor) models had trophic state variable as first predictor second predictor. Further, profiles components indicated transformations long-term release, especially deeper maximum depth longer residence time. Finally, correlated quality variables including phytoplankton biomass, its proportion cyanobacteria, chlorophyll index. Our findings suggest reduction will decrease loads increase through reduced

Язык: Английский

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Rewetting impact on the hydrological function of a drained peatland in the boreal landscape

Journal of Hydrology, Год журнала: 2024, Номер 641, С. 131729 - 131729

Опубликована: Июль 30, 2024

Язык: Английский

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Benthic bacterial communities are shaped by browning in boreal headwater streams

Limnology and Oceanography, Год журнала: 2025, Номер unknown

Опубликована: Янв. 21, 2025

Abstract Owing to the rapid progress of high‐throughput sequencing technologies, microbial assemblages have gained growing interest in environmental impact assessment. However, research on community responses, particularly those benthic biofilm, browning (increased concentrations dissolved organic carbon [DOC]), is scarce. We used data from 55 boreal streams examine if biofilm bacterial communities exhibit changes diversity and composition along a gradient (3.6–27 mg DOC L −1 ). Species richness increased slightly with increasing DOC, whereas changed markedly across gradient, especially active community. Pseudomonadota Bacteroidota were overall dominant phyla. In community, became relatively less abundant more DOC. Nitrate‐N (NO 3 ‐N) most important predictors turnover. The greatest change occurred between 75 100 μ g NO ‐N . For first point was at low‐end followed by major strongly brownified waters (> 20 Bacterial phylogenetically similar than expected chance as increased. Concordance invertebrate very high, indicating that exerts strong control over both taxonomic groups. Our results suggest communities, portion may provide sensitive reliable tool for stream bioassessment. defined threshold‐type response water but needed responses multiple simultaneous stressors related global warming land‐use intensification.

Язык: Английский

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Catchment-based approach for water table management with irrigation for cultivated peatlands

Agricultural Water Management, Год журнала: 2025, Номер 312, С. 109427 - 109427

Опубликована: Март 12, 2025

Язык: Английский

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Cumulative and discrete effects of forest harvest and drainage on the hydrological regime and nutrient dynamics in boreal catchments

Forest Ecology and Management, Год журнала: 2025, Номер 585, С. 122605 - 122605

Опубликована: Март 17, 2025

Язык: Английский

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Family forest owner’s perspectives on headwater streams in boreal forests: Motivations, values, and conservation actions

AMBIO, Год журнала: 2025, Номер unknown

Опубликована: Апрель 5, 2025

Abstract Boreal headwater streams are vital for forest biodiversity and larger water bodies but face challenges from management. Understanding owner’s views is key effective Our research surveys family owners to explore: (1) their perception of stream value, (2) factors driving willingness protect streams, (3) if motivations ownership vary by residence. Most motivated recreation. Those living far forests prioritize landscape, heritage, more than nearby residents. While recognize the importance protection, this does not always influence management choices. Owners who familiar with link between health willing logging impacts. These findings highlight need better advice policies on managing quality biodiversity.

Язык: Английский

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The role of land use in terrestrial support of boreal lake food webs

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Апрель 15, 2025

Abstract There is growing awareness of the importance cross-boundary energy and nutrient transfers between adjacent ecosystems. Lake ecosystems receive inputs terrestrial organic matter that microbes can make available to higher level consumers. However, how environmental drivers influence this support benthic pelagic consumers at multiple trophic levels remains underexplored. Using hydrogen stable isotopes as a tracer matter, we find large variation in aquatic (i.e., consumer allochthony) among 35 boreal lakes. Of 19 different organisms, show highest allochthony. Consumer allochthony decreases along an gradient from forested agricultural catchments, likely due shifts origin nature lake matter. Our results demonstrate cross-ecosystem transfer community dynamics recipient ecosystems, with anthropogenic management donor affecting structure function food webs

Язык: Английский

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