Environmental Controls on the Conversion of Nutrients to Chlorophyll in Lakes

Water Research, Год журнала: 2025, Номер 274, С. 123094 - 123094

Опубликована: Янв. 4, 2025

Язык: Английский

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A global assessment of lake restoration in practice: New insights and future perspectives

Ecological Indicators, Год журнала: 2023, Номер 158, С. 111330 - 111330

Опубликована: Дек. 5, 2023

A global survey of 179 restoration practitioners spanning 65 countries identified the extent stakeholder engagement as a key factor determining success or failure projects. Lack support across sectors and for funding, policy, monitoring, governance knowledge assessment pressures their effects were most frequently cited factors contributing to failure. The responses indicate that, although nutrient enrichment is perceived be primary issue lakes globally, impacts climate change, hydrological modifications invasive species are widely recognized pervasive anthropogenic importance. Practitioners that ecosystem services impacted by these recreation tourism, in low income provisioning service, aquaculture, was considered impacted. Ecology-based and/or pressure-related targets had been set programs our survey. However, strength evidence underpinning often weak change rarely when setting targets. effective used measures target loading (both catchment in-lake) while implementation nature-based solutions lesser extent. Measures control non-native applied viewed being largely ineffective. results provide direction future work. New emerging pressures, singly combination, may require new approaches lake restoration: both devising strategies. depends on joined-up thinking better integrates science into policy practice and, importantly, ensures strong inclusive collaboration multiple sectors.

Язык: Английский

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Regime shifts in shallow lakes explained by critical turbidity

Water Research, Год журнала: 2023, Номер 242, С. 119950 - 119950

Опубликована: Апрель 7, 2023

Worldwide, water quality managers target a clear, macrophyte-dominated state over turbid, phytoplankton-dominated in shallow lakes. The competition mechanisms underlying these ecological states were explored the 1990s, but concept of critical turbidity seems neglected contemporary models. In particular, simple mechanistic model alternative stable lakes accounting for resource and is lacking. To this end, we combined Scheffer's theory on with insights from nutrient light founded by Tilman, Huisman Weissing. This resulted novel graphical mathematical model, GPLake-M, that relatively mechanistically understandable yet captures essential leading to process-based PCLake was used parameterize parameters test GPLake-M using pattern-oriented strategy. GPLake-M's application range position spectrum are discussed. We believe our results support fundamental understanding regime shifts provide starting point further management-focused explorations development. Furthermore, relation between light-limited submerged macrophytes nutrient-limited phytoplankton might new focus empirical aquatic research monitoring programs.

Язык: Английский

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Setting nutrient boundaries to protect aquatic communities: The importance of comparing observed and predicted classifications using measures derived from a confusion matrix

The Science of The Total Environment, Год журнала: 2023, Номер 912, С. 168872 - 168872

Опубликована: Ноя. 25, 2023

Defining nutrient thresholds that protect and support the ecological integrity of aquatic ecosystems is a fundamental step in maintaining their natural biodiversity preserving resilience. With increasing catchment pressures climate change, it more important than ever to develop clear methods establish for status classification management waters. This must often be achieved using complex data should robust interference from additional as well ameliorating or confounding conditions. We use both artificial real examine challenges setting unbalanced skewed data. found significant advantages binary logistic regression over other techniques. However, one key objectively selecting probability which derive threshold. For this purpose, examination proportions matching mismatching classifications nutrients biological quality element confusion matrix widely adopted threshold selection. examined large array statistical measures accuracy performance combinations skewness imbalance The most appropriate compromise between maximising overall reducing mismatches expressed commission (false positives) without excessive omission negatives). An application lake type indicated total phosphorus would around 50 μg l−1 lower by an 'unguided' approach, indicating approach very development meriting attention national authorities responsible water management.

Язык: Английский

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Why are there so many definitions of eutrophication?

Ecological Monographs, Год журнала: 2024, Номер 94(3)

Опубликована: Июнь 27, 2024

Abstract Because of the first observations in 1900s oligotrophic and eutrophic states lakes, researchers have been interested process that makes lakes become turbid because high phytoplankton biomass. Definitions eutrophication multiplied diversified since mid‐20th century, more than for any other ecological process. Reasons number definitions might be former ones did not sufficiently describe their causes and/or consequences. Global change is bringing into spotlight ever, highlighting need to find consensus on a common definition, or at least explain clarify why there are different meanings term eutrophication. To patterns, we analyzed 138 were classified by multiple correspondence factor analysis (MCA) three groups. The group contains most generic scientific but many these limit increased nutrient availability. A single definition takes account all would require additional work itself. Nutrient pollution, which far primary cause Anthropocene, has generated second environmental often specify producers involved. Those mention iconic consequences such as algal biomass, anoxia/hypoxia reduced biodiversity. third operational definitions, focusing ecosystem services therefore associated with management issues. This related regulations, mainly US laws European directives. These numerous directly derived from problem enlarged landscape reflect warn, legislate implement solution remedy it. Satisfying this demand should confused research must based communicating knowledge people possible using simplest vocabulary. We propose (groups 2 3) name “nutrient pollution,” making it refine (scientific) expand challenges climate warming, overfishing, nonnutrient‐related chemical pollutions.

Язык: Английский

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Recent regional changes in nutrient fluxes of European surface waters

The Science of The Total Environment, Год журнала: 2022, Номер 858, С. 160063 - 160063

Опубликована: Ноя. 8, 2022

We have quantified inputs and fate of nutrients in European fresh marine waters from 1990 to 2018. used the conceptual model GREEN assess impact efforts on curbing nutrient pollution regions. In first two decades, i.e. 1990s through start new millennium, decreased significantly. Nutrient freshwaters sea largely reduced all regions, although at different pace. However, around 2008-2010 trends changed, marking an increase last decade, particularly agricultural diffuse sources. some current are close those estimated beginning 1990s. At end study period, concentrations remain above thresholds congruent with good ecological status water bodies most downstream reaches. policies tackling point sources reach their maximum impact. face this approaching ceiling, sustainable management land becomes pivotal for effective control river basins. The regional approach highlighted differences across Europe that may provide tailored opportunities plan strategies achieving environmental targets.

Язык: Английский

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Ecological threshold of phosphorus load in Baiyangdian Lake based on a PCLake model and ecological network analysis

The Science of The Total Environment, Год журнала: 2024, Номер 915, С. 170091 - 170091

Опубликована: Янв. 15, 2024

Ecological thresholds are a useful indicator for implementing ecological management. Many studies determine the nutrient loads in lakes based on maximum allowable concentration of chlorophyll (Chla), although this neglects overall performance ecosystem. A PCLake model Baiyangdian (BYD) Lake northern China was constructed with six network analysis (ENA) indicators that characterized ecosystem function, system maturity, and food web structure to quantify status BYD To my knowledge, is first study level responses phosphorus load interference. Different scenarios were designed simulate Lake. The simulated results employed calculate ENA indicators. determined through driving response relationship between gradient show non-linear transition under gradient. As increases, D/H, SOI, FCI decreases while A/DC, TPP/TR, TPP/TB increases. This indicates function will deteriorate if 0.50-1.32 mg m

Язык: Английский

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End-of-season supplementary feeding in European carp ponds with appropriate plant protein and carbohydrate combinations to ecologically boost productivity: Lupine, rapeseed and, triticale

Aquaculture, Год журнала: 2023, Номер 577, С. 739906 - 739906

Опубликована: Июль 22, 2023

Язык: Английский

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Threshold amounts of nutrients and the relationship with chlorophyll a during eutrophication phenomenon in small-scale artificial reservoirs

Environmental and Sustainability Indicators, Год журнала: 2024, Номер 22, С. 100378 - 100378

Опубликована: Март 15, 2024

This study aimed at determining the relationship of chlorophyll a (Chl a) and nutrients in two reservoirs different sizes, namely Bueng Si Than Thung Sang, which are located Khon Kaen Province Thailand. The evaluation trophic state index estimated threshold amounts was consequently considered. Water samples were collected during both dry rainy seasons with twenty-seven sampling points each reservoir. Parameters indicating water quality based on APHA method. results showed significant difference average physicochemical properties nutritional parameters smaller proportion, having more than Sang (p < 0.05). Nutrient factors (TP, TKN) impact occurrence eutrophication season season. Average ratios Chl together revealed hypertrophic conditions reservoirs. high value a:TP signaled that algal growth these could be controlled by TP. Pearson correlation analysis indicated strong positive TP Than. Moreover, obtained from simulation achieved using MATLAB R2022a, performed fourth order polynomial equation, boundary values 28.25–29.42 μg/L 4.15-4.19 mg/L for TKN prior to Eutrophic occurrence, ascertain further management small-scale artificial

Язык: Английский

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Knowing your limits: Patterns and drivers of nutrient limitation and nutrient–chlorophyll relationships in US lakes

Limnology and Oceanography Letters, Год журнала: 2024, Номер 9(6), С. 725 - 734

Опубликована: Июль 1, 2024

Abstract Although understanding nutrient limitation of primary productivity in lakes is among the oldest research priorities limnology, there have been few broad‐scale studies characteristics phosphorus (P)‐, nitrogen (N)‐, and co‐limited their environmental context. By analyzing 3342 US with concurrent P, N, chlorophyll a (Chl ) samples, we showed that are predominantly (43%) or P‐limited (41%). Majorities were Northeast, Upper Midwest, Southeast, co‐limitation was most prevalent interior western United States. N‐limitation (16%) more than P‐limitation Great Basin Central Plains. Nutrient related to lake, watershed, regional variables, including Chl concentration, watershed soil, wet nitrate deposition. N P concentrations interactively affected nutrient–chlorophyll relationships, which differed by limitation. Our study demonstrates value considering context relationships.

Язык: Английский

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