Benthic bacterial communities are shaped by browning in boreal headwater streams

Limnology and Oceanography, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 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.

Language: Английский

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Role of forest ditching and agriculture on water quality: Connecting the long-term physico-chemical subsurface state of lakes with landscape and habitat structure information

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 806, P. 151477 - 151477

Published: Nov. 4, 2021

Increasing anthropogenic pressures have affected the status of surface freshwater ecosystems. Eutrophication, water browning, acidification, and several other processes may be channelled through food web. In this study, we evaluate role hydrology impacting pressures, flows from urban, farmland ditched forest areas, how they explain physico-chemical quality lakes ponds in boreal biome Finland. We study long-term effect around 445 waterfowl survey sites that had measurements (total phosphorus, total nitrogen, pH, clarity colour) produced by Finnish environmental authorities done years 1986-2020. Furthermore, investigate whether a national-level citizen science focusing on rather robust visible habitat structures measured volunteers can reveal using data >270 where could spatio-temporally matched. Farmland occurrence was positively associated with colour nutrient concentrations but negatively clarity. ditch length nitrogen concentration colour, while being pH Overall, studied showed negative trend nutrients positive colour. As expected, increased decreased along gradient oligotrophic to eutrophic lake classifications, which suggests classification seem reflect subsurface lakes. conclude farming ditching practices particular associate state ecological impacts intensified turbidity brownification wetland ecosystems should further future. Sustainable improvement rests upon scientific understanding biogeochemical primary sources sediment loading.

Language: Английский

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Land‐use dominates climate controls on nitrogen and phosphorus export from managed and natural Nordic headwater catchments

Hydrological Processes, Journal Year: 2020, Volume and Issue: 34(25), P. 4831 - 4850

Published: Oct. 11, 2020

Abstract Agricultural, forestry‐impacted and natural catchments are all vectors of nutrient loading in the Nordic countries. Here, we present concentrations fluxes total nitrogen (totN) phosphorus (totP) from 69 headwater (Denmark: 12, Finland:18, Norway:17, Sweden:22) between 2000 2018. Catchments span range climatic environmental conditions include sites impacted by agricultural forest management. Concentrations totN totP were highest catchments, intermediate lowest positively related %agricultural land cover summer temperature. Summer temperature may be a proxy for terrestrial productivity, while might catchment inputs. A regional trend analysis showed significant declines N export across (−15 μg L −1 year ) (−0.4 NO 3 ‐N but individual displayed few long‐term trends (totN: 22%, totP: 25%) or 6%, 9%). Forestry‐impacted had decline (−0.1 P ). small increase (+0.4 kg km −2 was found, countries contrasting patterns. Trends annual could not explained straightforward way changes runoff climate. Explanations national mitigation measures agriculture international policy to reduced air pollution and, possibly, large‐scale increases growth. Mitigation reduce appears more challenging than nitrogen. If green shift entails intensification production, new challenges protection water quality will emerge possible exacerbated climate change. Further should seasonal trends, aquatic species focus on

Language: Английский

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Multiple stressors in small streams in the forestry context of Fennoscandia: The effects in time and space

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 756, P. 143521 - 143521

Published: Nov. 13, 2020

In this paper we describe how forest management practices in Fennoscandian countries, namely Sweden and Finland, expose streams to multiple stressors over space time. region, forestry includes several different actions explore these may successively disturb the same location 60–100 year long rotation periods. Of actions, final harvest associated road construction, soil scarification, and/or ditch network maintenance are most obvious sources of aquatic ecosystems. Yet, more subtle such as planting, thinning competing saplings trees, removing logging residues also represent disturbances around waterways landscapes. We review literature about introduce a combination physicochemical stressors, including hydrological change, increased sediment transport, altered thermal light regimes, water quality deterioration. further elaborate on single combine interact consequently hypothesise interactions affect communities processes. Because production is practiced large area both various appear times during cycles potentially majority stream length within catchments. concluded that have traditionally not been focus stressor studies should be investigated observational experimental fashion. Stressors accumulate across time dominated landscapes, unpredictable ways, limiting our current understanding what forested networks exposed can design apply best practices.

Language: Английский

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Restoration from eutrophication in interconnected reservoirs: Using a model approach to assess the propagation of water quality improvements downstream along a cascade system

Environmental Modelling & Software, Journal Year: 2022, Volume and Issue: 149, P. 105308 - 105308

Published: Jan. 10, 2022

Language: Английский

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Land use contribution to spatiotemporal stream water and ecological quality: Implications for water resources management in peri-urban catchments

Ecological Indicators, Journal Year: 2022, Volume and Issue: 143, P. 109360 - 109360

Published: Aug. 29, 2022

Climate change and intensifying agricultural production urbanization are central factors driving the global freshwater biodiversity decline. To design sustainable green transition schemes support urban planning, a deeper understanding of numerous interacting physicochemical biogeochemical processes their relation to ecological quality becomes essential. This study thus aims explore links between hydrological regimes patterns evident for key water parameters benthic invertebrate indicators in peri-urban catchment that has undergone several stream restoration projects. Results indicate significant seasonal variability discharge physico-chemical confounding identification sources behind detrimental impacts on quality, which may lead implementation inappropriate mitigation strategies. Notably, sampling at sub-catchment level underlined dynamic contributions both urban-like areas nitrogen phosphorus, while non-volatile carbon was mainly exported from lands. Multivariate statistical methods were used classify macro- meioinvertebrate (specifically nematode) taxa showing poor-to-moderate poor-to-good respectively. Poor mostly found upstream part catchment, driven by combination low habitat periodically impaired conditions (e.g. dissolved oxygen, temperature, suspended solids). In addition, nematode-based stress index NemaSPEAR[%] (expressing proportion species-at-risk within sample specifically sensitive chemical contamination), indicated TSS-related transport contaminants sediment. It could also reveal negative different features (low just downstream combined sewer overflows), as well potential benefits wastewater effluents (i.e. good via well-treated flow limited fine sediment accumulation especially summer) ecosystem. Our results highlight use this indicator, with high frequency monitoring promising techniques better link land spatiotemporal changes quality.

Language: Английский

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Modelling the impact of the Nordic Bioeconomy Pathways and climate change on water quantity and quality in a Danish River Basin

CATENA, Journal Year: 2022, Volume and Issue: 222, P. 106795 - 106795

Published: Nov. 28, 2022

Language: Английский

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Browning of boreal lakes: Do public perceptions and governance align with the biological foundations?

Ecological Applications, Journal Year: 2023, Volume and Issue: 33(5)

Published: April 23, 2023

Abstract Browning of surface waters, also known as brownification, is a process decreasing water transparency, particularly in boreal lakes surrounded by intensively managed forests and wetlands. In this paper, we review the ecological consequences ecosystem‐based management (EBM) browning through systematic approach adopt an interdisciplinary to formulating new governance complex phenomenon. To understand effects on recreational value freshwaters, present primary survey data public perceptions fishing tourists quality Finland. We identify need develop EBM beyond EU's Water Framework Directive (WFD) fully account for extensive implications browning. highlight better understanding within‐lake microbial processes estimate browning‐associated changes greenhouse gas balance lakes. Tourist waterbodies Finland were largely agreement with general proportion classified good or excellent status class, but these may be detached from biological assessment criteria. Consequently, suggest that inland waters should improve utilization information not only biogeochemical users' perspectives aquatic ecosystems EU WFD.

Language: Английский

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Land-use change in a Nordic future towards bioeconomy: A methodological framework to compare and merge stakeholder and expert opinions on qualitative scenarios

CATENA, Journal Year: 2023, Volume and Issue: 228, P. 107100 - 107100

Published: April 23, 2023

Future development of bioeconomy is expected to change land use in the Nordic countries agriculture and forestry. The changes are likely affect water quality due nutrient run-off. To explore possible future land-use their environmental impact, stakeholders experts from four (Denmark, Finland, Norway Sweden) were consulted. methodological framework for consultation was identify a set relevant attributes forestry, e.g. tillage conservation effort, fertiliser use, animal husbandry, biogas production manure, forestry management options, implementation mitigation measures, including protection sensitive areas. provided opinions on how these might terms impacts given five bioeconomic scenarios (sustainability, business as usual, self-sufficiency, cities first maximizing economic growth). A compilation methodology developed allow comparing merging stakeholder expert each attribute scenario. compiled suggest that business-as-usual scenario may slightly decrease current impact most new technologies, but sustainability would be only option achieve clear improvement. In contrast, self-sufficiency scenario, well maximum growth deterioration environment attributes. results consultations used inputs models estimating run-off catchments (as reported other papers this special issue). Furthermore, will facilitate policy level discussions concerning shift with increasing biomass exploitation without deteriorating ecological status rivers lakes.

Language: Английский

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Water governance for water security: analysing institutional strengths and challenges in Finland

International Journal of Water Resources Development, Journal Year: 2023, Volume and Issue: 40(2), P. 153 - 173

Published: Nov. 9, 2023

The relationship between water security and governance across different water-using sectors remains under-researched. We apply the Organisation for Economic Co-operation Development's (OECD) Water Governance Indicator Framework with revised principles criteria to analyse three critical in Finland: bioeconomy, mining infrastructure. Our findings indicate that as a concept helps both assess clarify priorities, while well-functioning engagement of key actors is prerequisite broader security. Given differing interests emerging pressures related water, ensuring requires well-resourced public sector agencies coordinate interaction actors.

Language: Английский

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