OECD: Eutrophication of Waters. Monitoring, Assessment and Control. — 154 pp. Paris: Organisation for Economic Co‐Operation and Development 1982. (Publié en français sous le titre »Eutrophication des Eaux. Méthodes de Surveillance, d'Evaluation et de Lutte«)

Caspers, H.

doi:10.1002/iroh.19840690206

Cited by 29 publications

(9 citation statements)

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“…Only lakes from the EPA database where TP was ≥3 μg L −1 were used in the analysis. The trophic state classifications were based on Caspers () for annual mean chlorophyll a levels…”

Section: Spatial Differences In Nutrients and Eutrophicationmentioning

confidence: 99%

Nutrients, eutrophication and harmful algal blooms along the freshwater to marine continuum

2019

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Agricultural, urban and industrial activities have dramatically increased aquatic nitrogen and phosphorus pollution (eutrophication), threatening water quality and biotic integrity from headwater streams to coastal areas world-wide. Eutrophication creates multiple problems, including hypoxic "dead zones" that reduce fish and shellfish production; harmful algal blooms that create taste and odor problems and threaten the safety of drinking water and aquatic food supplies; stimulation of greenhouse gas releases; and degradation of cultural and social values of these waters. Conservative estimates of annual costs of eutrophication have indicated $1 billion losses for European coastal waters and $2.4 billion for lakes and streams in the United States. Scientists have debated whether phosphorus, nitrogen, or both need to be reduced to control eutrophication along the freshwater to marine continuum, but many management agencies worldwide are increasingly opting for dual control. The unidirectional flow of water and nutrients through streams, rivers, lakes, estuaries and ultimately coastal oceans adds additional complexity, as each of these ecosystems may be limited by different factors. Consequently, the reduction of just one nutrient upstream to control eutrophication can allow the export of other nutrients downstream where they may stimulate algal production. The technology exists for controlling eutrophication, but many challenges remain for understanding and managing this global environmental problem.

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“…Only lakes from the EPA database where TP was ≥3 μg L −1 were used in the analysis. The trophic state classifications were based on Caspers () for annual mean chlorophyll a levels…”

Section: Spatial Differences In Nutrients and Eutrophicationmentioning

confidence: 99%

Nutrients, eutrophication and harmful algal blooms along the freshwater to marine continuum

2019

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“…The nutrient concentrations were analysed in microcosms after the nutrient enrichments and after the incubation periods (Supporting Information Figure S5). classification (Hart, 1984). Average SRP concentrations were significantly different between lakes FRE (0.006 ± 0.001 mg/L) and TRE (0.009 ± 0.002 mg/L; Kruskal-Wallis, p-value < 0.01).…”

Section: Responses To Nutrient Enrichmentsmentioning

confidence: 87%

Growth rate of alpine phytoplankton assemblages from contrasting watersheds and N‐deposition regimes exposed to nitrogen and phosphorus enrichments

Jacquemin¹,

Bertrand²,

Oursel³

et al. 2018

Freshwater Biology

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High mountain lakes are a network of sentinels, sensitive to any events occurring within their waterbodies, their surrounding catchments and their airsheds. By modifying nutrient balance and availability in water, both local and global changes are expected to alter primary productivity and to trigger strong ecological impacts in these ecosystems. Predicting ecological trajectories under future change is a key challenge for both scientists and conservation managers. French alpine lakes, in the most southern and western part of the European Alps, have received surprisingly little attention to date. In this article, we address how variations in nitrogen (N) and phosphorus (P) supply are likely to impact the area's phytoplankton growth. We performed N and/or P enrichment microcosm experiments under controlled conditions on 12 phytoplankton assemblages sampled during the summer 2016 in four French alpine lakes with contrasting catchments and N‐deposition regimes. The nutrients limiting phytoplankton growth varied according to the nutrient stoichiometry of the lake water. In the lakes exposed to high N‐deposition rates (≈700 kg N km–2 year–1), the water contained more N than P and phytoplankton growth in microcosms was either limited by P or not limited by either N or P. In the lakes exposed to low N‐deposition rates (≈500 kg N km–2 year–1), N availability relative to P was lower in the lake with vegetated catchment than in the lake with rocky catchment, resulting in a switch from P to NP colimitation of the phytoplankton in microcosms. Our data clearly indicate that French alpine lakes do not host the same diversity and structure of phytoplankton communities and that phytoplankton composition influenced phytoplankton growth in microcosms. First, we show that nonmotile colonial chlorophytes appeared in late summer assemblages, with lower growth rates but P‐storage abilities. Second, our findings indicate that the growth of phytoplankton assemblages dominated by diatoms was increasingly limited by silica (SiO2) throughout the summer, along with a 70% decrease in SiO2 concentration in lake water. The forecast global changes in the French Alps should increase phytoplankton growth in most high mountain lakes where P is the main limiting nutrient, before NP colimitation. These changes are likely to be of lesser extent in lakes with large vegetated catchments in the northern area with lower N‐deposition rates and of greater extent in the southern area with higher N‐deposition rates and future P‐deposition rates. By investigating the relationship between nutrient availability, phytoplankton composition and phytoplankton growth rate, this experimental laboratory microcosm study will help interpret current multifactorial data from in situ monitoring networks in the Alps. It will also be helpful to develop models to better predict the sentinel lake responses to local and global changes.

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“…The species was described in 1996 as an oligotrophic indicator species [ 90 ]. We found it in three hypertrophic ponds (the total phosphorus concentrations were above 100 μg L -1 , which is the limit of hypertrophic conditions [ 91 ], all of them were subsaline (2–2.8 g L -1 ) according to the Hammer’s [ 9 ] categorization and belonged to the “transparent” group. Gomphonema jadwigiae is a rare species worldwide.…”

Section: Discussionmentioning

confidence: 99%

Unexpected consequences of bombing. Community level response of epiphytic diatoms to environmental stress in a saline bomb crater pond area

et al. 2018

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The spatial response of epiphytic diatom communities to environmental stress was studied in a moderately saline wetland area located in the plain of Danube-Tisza Interfluve, Hungary. The area is characterised by World War II bomb crater ponds and can be regarded as an excellent ecological model system where the dispersion of species is slightly limited by distance. To study the effect of environmental variables on the communities, canonical correspondence analysis was applied. Salinity, pH, total suspended solids, total phosphorous and depth proved to be significant environmental drivers in this analysis. The ecological status of the ponds was assessed with Ziemann’s halobity index, as the trophity-depending metric cannot be applied to these habitats (due to the naturally high phosphorus content). Ponds in “good” ecological status significantly differed from those appertaining to water quality category of “not-good” ecological status considering characteristic of natural astatic soda pans (e.g. salinity, pH, ammonium, total phosphorous concentration, nitrogen:phosphorous ratio and turbidity). The differences between epiphytic diatom communities inhabiting the ponds were detected using non-parametric multidimensional scaling. The samples formed three groups according to the types of ponds (“transparent”, “transitional” and “turbid”) based on the width of the macrophyte belt around them. Indicator species related to the ecological status of the ponds and diatom communities contributing to the separation of groups of ponds were identified. One of the indicator species differed from species already described. Light and scanning electron microscopy features and phylogenetic analyses based on three genes (18S and 28S rRNA genes, rbcL) proved that it was a new species of Nitzschia genus, closely related to Nitzschia frustulum and Nitzschia inconspicua. Therefore, description of a new species, Nitzschia reskoi Ács, Duleba, C.E.Wetzel & Ector is proposed. We concluded that the increasing abundance of Nitzschia reskoi was a signal of the degradation of the intermittent saline wetlands.

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OECD: Eutrophication of Waters. Monitoring, Assessment and Control. — 154 pp. Paris: Organisation for Economic Co‐Operation and Development 1982. (Publié en français sous le titre »Eutrophication des Eaux. Méthodes de Surveillance, d'Evaluation et de Lutte«)

Cited by 29 publications

References 0 publications

Nutrients, eutrophication and harmful algal blooms along the freshwater to marine continuum

Nutrients, eutrophication and harmful algal blooms along the freshwater to marine continuum

Growth rate of alpine phytoplankton assemblages from contrasting watersheds and N‐deposition regimes exposed to nitrogen and phosphorus enrichments

Unexpected consequences of bombing. Community level response of epiphytic diatoms to environmental stress in a saline bomb crater pond area

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