Recent advancement in water quality indicators for eutrophication in global freshwater lakes

Environmental Research Letters, Год журнала: 2023, Номер 18(6), С. 063004 - 063004

Опубликована: Апрель 26, 2023

Abstract Eutrophication is a major global concern in lakes, caused by excessive nutrient loadings (nitrogen and phosphorus) from human activities likely exacerbated climate change. Present use of indicators to monitor assess lake eutrophication restricted water quality constituents (e.g. total phosphorus, nitrogen) does not necessarily represent environmental changes the anthropogenic influences within lake’s drainage basin. Nutrients interact multiple ways with climate, basin conditions socio-economic development, point-source, diffuse source pollutants), systems. It therefore essential account for complex feedback mechanisms non-linear interactions that exist between nutrients ecosystems assessments. However, lack set holistic understanding challenges such assessments, addition limited monitoring data available. In this review, we synthesize main freshwater basins only include but also sources, biogeochemical pathways responses emissions. We develop new causal network (i.e. links indicators) using DPSIR (drivers-pressure-state-impact-response) framework highlights interrelationships among provides perspective dynamics basins. further review 30 key drivers pressures seven cross-cutting themes: (i) hydro-climatology, (ii) socio-economy, (iii) land use, (iv) characteristics, (v) crop farming livestock, (vi) hydrology management, (vii) fishing aquaculture. This study indicates need more comprehensive systems, guide expansion networks, support integrated assessments manage eutrophication. Finally, proposed can be used managers decision-makers realistic targets sustainable management achieve clean all, line Sustainable Development Goal 6.

Язык: Английский

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Human activities' fingerprint on multitrophic biodiversity and ecosystem functions across a major river catchment in China

Global Change Biology, Год журнала: 2020, Номер 26(12), С. 6867 - 6879

Опубликована: Сен. 16, 2020

Abstract Human‐induced global change dramatically alters individual aspects of river biodiversity, such as taxonomic, phylogenetic or functional diversity, and is predicted to lead losses associated ecosystem functions. Understanding these dependencies are critical human well‐being. Until now, however, most studies have only looked either at organismal groups single functions, little known on the effect activities multitrophic biodiversity multifunctionality in riverine ecosystem. Here we profiled from bacteria invertebrates based environmental DNA (hereafter, ‘eDNA’) samples across a major catchment China, analysed their with multiple especially linked C/N/P‐cycling. Firstly, found spatial cross‐taxon congruence pattern communities' structure network Shaying river, which was related strong filtering due land use. Secondly, use explained decline multifaceted but increased redundancy Thirdly, function relationships an integrative level showed concave‐up (non‐saturating) shape. Finally, structural equation modeling suggested that affects functions through biodiversity‐mediated pathways, including loss altered community interdependence groups. Our study highlights value complete inclusive assessment for integrated land‐use management ecosystems.

Язык: Английский

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The concept, approach, and future research of hydrological connectivity and its assessment at multiscales

Environmental Science and Pollution Research, Год журнала: 2021, Номер 28(38), С. 52724 - 52743

Опубликована: Авг. 30, 2021

Язык: Английский

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Twenty‐five essential research questions to inform the protection and restoration of freshwater biodiversity

Aquatic Conservation Marine and Freshwater Ecosystems, Год журнала: 2021, Номер 31(9), С. 2632 - 2653

Опубликована: Июль 12, 2021

Abstract Freshwater biodiversity is declining at an unprecedented rate. conservationists and environmental managers have enough evidence to demonstrate that action must not be delayed but insufficient identify those actions will most effective in reversing the current trend. Here, focus on identifying essential research topics that, if addressed, contribute directly restoring freshwater through supporting ‘bending curve’ (i.e. leading recovery of biodiversity, simply deceleration downward trend). The global management community was asked unanswered questions could address knowledge gaps barriers associated with actions. resulting list refined into six themes 25 questions. Although context‐dependent potentially limited reach, overarching were identified: (i) learning from successes failures; (ii) improving practices; (iii) balancing resource needs; (iv) rethinking built environments; (v) reforming policy investments; (vi) enabling transformative change. Bold, efficient, science‐based are necessary reverse loss. We believe conservation when supported by sound evidence, complement one another. These intended guide researchers practitioners, key projects signal needs funders governments. Our can act as springboards for multidisciplinary multisectoral collaborations improve restoration biodiversity.

Язык: Английский

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Towards (better) fluvial meta-ecosystem ecology: a research perspective

npj Biodiversity, Год журнала: 2024, Номер 3(1)

Опубликована: Фев. 7, 2024

Rivers are an important component of the global carbon cycle and contribute to atmospheric exchange disproportionately their total surface area. Largely, this is because rivers efficiently mobilize, transport metabolize terrigenous organic matter (OM). Notably, our knowledge about magnitude globally relevant fluxes strongly contrasts with lack understanding underlying processes that transform OM. Ultimately, OM processing en route oceans results from a diverse assemblage consumers interacting equally pool resources in spatially complex network heterogeneous riverine habitats. To understand interaction between OM, we must therefore account for spatial configuration, connectivity, landscape context at scales ranging local ecosystems entire networks. Building such explicit framework fluvial across may also help us better predict poorly understood anthropogenic impacts on cycling, instance human-induced fragmentation changes flow regimes, including intermittence. Moreover, current unprecedented human-driven loss biodiversity. This least partly due mechanisms operating scales, as interference migration habitat homogenization, comes largely unknown functional consequences. We advocate here comprehensive networks connecting two aware but disparate lines research (i) metacommunities biodiversity, (ii) biogeochemistry contribution cycle. argue agenda focusing regional scale-that is, river network-to enable deeper mechanistic naturally arising biodiversity-ecosystem functioning coupling major driver biogeochemically fluxes.

Язык: Английский

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Hydrological Connectivity of Distributary‐Confluence Geomorphic Unit: A Case Study of H‐Shaped Features Within River Networks

Water Resources Research, Год журнала: 2025, Номер 61(4)

Опубликована: Март 31, 2025

Abstract The H‐shaped feature, characterized by a single connecting channel (CC) linking two inflows, is common geomorphological unit in delta river networks. This structure plays critical role redistributing upstream flows, affecting the hydrological connectivity of network. Despite previous studies on geometric structures and flow distribution, mechanisms influencing remain poorly understood due to complex deltas interactions among various controlling factors. study investigates distribution using numerical simulations graph theory. Results indicate that, structures, gravitational pressure caused variations Upstream Discharge Ratios (UDR) CC topography generates uneven spatial velocity fields, resulting different levels diversion capacity CC. indexes distributary subnetwork increase with growing CC, whereas confluence exhibits opposite trend. CC's influence downstream regulation influenced itself. Enhanced balances strengthens system resilience. emphasizes that simpler network topologies concentrate flows fewer channels while maintaining strong exchanges, networks distribute broadly but reduce inter‐subnetwork connectivity. Therefore, we recommend deltaic management consider their topological characteristics implement strategies such as constructing additional or modifying existing enhance exchange capacity. These findings offer valuable insights for global conservation

Язык: Английский

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Dynamic impacts of changes in river structure and connectivity on water quality under urbanization in the Yangtze River Delta plain

Ecological Indicators, Год журнала: 2022, Номер 135, С. 108582 - 108582

Опубликована: Янв. 25, 2022

The deterioration of river water quality in urbanized areas is getting more serious, and affects the regional ecology development social economy; however, its mechanisms dynamic variation still an open question. In this study, we detected dynamics driven Yangtze River Delta plain, one most developed China. results showed that spatial agglomerations dissolved oxygen (DO), ammonia nitrogen (NH3-N), total phosphorus (TP) presented seasonal differences, which exhibited a trend shifting from west to east then spring winter. Further, relative contribution rates network characteristics affecting were quantified on basis backpropagation artificial neural networks. We found average structure (more than 60%) higher connectivity, dominant factors influencing surface ratio (WP) multifractal indices (Δa, Δf). Specifically, WP, Δa Δf 18.72%, 15.03%, 14.52% during flood season, respectively, 15.83%, 16.58%, 14.54% non-flood season. functional connectivity influenced by obstruction sluices also influences quality, accounting for 11.15% 12.85% seasons, respectively.

Язык: Английский

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Environmental DNA metabarcoding reveals the impact of different land use on multitrophic biodiversity in riverine systems

The Science of The Total Environment, Год журнала: 2022, Номер 855, С. 158958 - 158958

Опубликована: Сен. 21, 2022

Язык: Английский

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Spatial patterns of site and species contributions to β diversity in riverine fish assemblages

Ecological Indicators, Год журнала: 2022, Номер 145, С. 109728 - 109728

Опубликована: Ноя. 25, 2022

Understanding the patterns and ecological determinants of β diversity in freshwater ecosystems is fundamental to biogeography, conservation biology, environmental management. It has been proposed that can be divided into contributions individual sites (LCBD) or species (SCBD) total diversity. However, underlying mechanisms LCBD SCBD remain understudied fish. Here, using fish assemblages sampled from Chishui River basin, we analysed based on both abundance presence-absence data. We also examined relationships between with site (i.e., community abundance, richness, functional indices, factors, spatial variables) occupancy, niche position breadth, traits) characteristics, respectively. Our results revealed basin was well explained by factors. Fish negatively related richness showing high uniqueness generally supported low abundance. Furthermore, features were significantly associated LCBD, specialization, originality, uniqueness, but divergence, dispersion. Abundance-based showed positive occupancy whereas there hump-shaped Niche correlated SCBD, breadth traits not significant correlates SCBD. Overall, this study suggests understanding key biodiversity variation its applied repercussions. advocate importance conditions between-site connectivity for effective riverine Moreover, a simultaneous application rare would most suitable approach conservation.

Язык: Английский

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Interventions of river network structures on urban aquatic microplastic footprint from a connectivity perspective

Water Research, Год журнала: 2023, Номер 243, С. 120418 - 120418

Опубликована: Июль 26, 2023

Язык: Английский

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