scholarly journals Internal Loading of Phosphorus from Bottom Sediments of Two Meso-eutrophic Lakes

2019 ◽  
Vol 13 (2) ◽  
pp. 235-251 ◽  
Author(s):  
Katarzyna Kowalczewska-Madura ◽  
Anna Kozak ◽  
Martyna Dera ◽  
Ryszard Gołdyn
Keyword(s):  
Bottom Sediments ◽  
Internal Loading ◽  
Eutrophic Lakes

Phosphorus release from the bottom sediments of Lake Rusałka (Poznań, Poland)

2010 ◽  
Vol 39 (4) ◽  
Author(s):  
Katarzyna Kowalczewska-Madura ◽  
Ryszard Gołdyn ◽  
Renata Dondajewska
Keyword(s):  
Experimental Research ◽  
Bottom Sediments ◽  
Significant Influence ◽  
Eutrophic Lake ◽  
Phosphorus Release ◽  
Internal Loading ◽  
Release Process

Phosphorus release from the bottom sediments of Lake Rusałka (Poznań, Poland)Experimental research conducted on bottom sediments from the eutrophic Lake Rusałka (Poznań, Poland) indicated that the phosphorus release process has a significant influence on the functioning of the ecosystem. Internal loading was very intense in the deepest part of the lake, where it reached up to 29.84 mg m

scholarly journals Retention and Internal Loading of Phosphorus in Shallow, Eutrophic Lakes

2001 ◽  
Vol 1 ◽  
pp. 427-442 ◽  
Author(s):  
Martin Sondergaard ◽  
Peder Jens Jensen ◽  
Erik Jeppesen
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Recovery Period ◽  
Internal Loading ◽  
External Loading ◽  
Lake Water Quality ◽  
Eutrophic Lakes ◽  
P Release ◽  
P Accumulation

This paper gives a general overview of the nature and important mechanisms behind internal loading of phosphorus (P), which is a phenomenon appearing frequently in shallow, eutrophic lakes upon a reduction of the external loading. Lake water quality is therefore not improved as expected. In particular summer concentrations rise and P retention may be negative during most of the summer. The P release originates from a pool accumulated in the sediment when the external loading was high. In most lake sediments, P bound to redox-sensitive iron compounds or P fixed in more or less labile organic forms constitute major fractions forms that are potentially mobile and eventually may be released to the lake water. The duration of the recovery period following P loading reduction depends on the loading history, but it may last for decades in lakes with a high sediment P accumulation. During the phase of recovery, both the duration and net P release rates from the sediment seem to decline progressively. Internal P loading is highly influenced by the biological structure as illustrated by lakes shifting from the turbid to the clearwater state as a result of, for example, biomanipulation. In these lakes P concentrations may be reduced to 50% of the pre-biomanipulation level and the period with negative retention during summer can thus be reduced considerably. The duration of internal loading can be reduced significantly by different restoration methods such as dredging to remove accumulated P or addition of iron or alum to elevate the sorption capacity of sediments. However, an important prerequisite for achieving long-term benefits to water quality is a sufficient reduction of the external P loading.

Comparison of gastrotrich fauna on elodeids and in bottom sediments of lakes of different trophic status (the region Polesie Lubelskie, Eastern Poland)

2011 ◽  
Vol 40 (2) ◽  
Author(s):  
Teresa Nesteruk
Keyword(s):  
Species Diversity ◽  
Bottom Sediment ◽  
Bottom Sediments ◽  
Trophic Status ◽  
Vegetation Type ◽  
Eutrophic Lake ◽  
Diversity Indices ◽  
Eutrophic Lakes ◽  
Epiphytic Fauna ◽  
Mesotrophic Lake

AbstractSpecies diversity of gastrotrich communities on elodeids and in bottom sediments of lakes of different trophic status was compared. Thirty-eight species of Gastrotricha (34 in bottom sediment and 21 on elodeids) were found, which belong to the only family of Chaetonotidae Zelinka, 1889. Species diversity of both habitats was reflected in the diversity indices ranging from 2.02 (a dystrophic lake) to 2.67 (a strongly eutrophic lake) for bottom sediment, and from 2.01 (a mesotrophic lake) to 2.54 (a strongly eutrophic lake) for elodeids. The similarity of gastrotrich fauna from the two habitats was low, and varied from 17% (a mesotrophic lake) to 38% (a strongly eutrophic lake). Low similarity of elodeid fauna from lakes of different trophic status was also found, in spite of similar plant species composition. The lowest similarity in elodeid fauna (23%) was recorded for dystrophic and mesotrophic lakes, whereas the highest one (68%) was observed for eutrophic and strongly eutrophic lakes. That allows to conclude that the diversity of epiphytic fauna is affected by trophic status rather than by vegetation type. The comparison of the gastrotrich fauna from elodeids and bottom sediments in lakes of different trophic status provides additional autoecological characteristics of Heterolepidoderma ocellatum (Mečnikow, 1865) and allows to recognize this species as belonging to a group of species closely related to macrophytes.

The bottom sediments of Lake Uzarzewskie - a phosphorus source or sink?

2010 ◽  
Vol 39 (3) ◽  
Author(s):  
Katarzyna Kowalczewska-Madura ◽  
Ryszard Gołdyn ◽  
Renata Dondajewska
Keyword(s):  
Spatial Variability ◽  
Bottom Sediments ◽  
Phosphorus Release ◽  
Internal Loading ◽  
Depth Range ◽  
Shallow Zone ◽  
Phosphorus Source

The bottom sediments of Lake Uzarzewskie - a phosphorus source or sink?Phosphorus release from bottom sediments studied in two zones of Lake Uzarzewskie differing in depth and water oxygenation displayed seasonal and spatial variability. The experiments indicated that the lake receives considerable internal loading, especially from the deeper, anaerobic, rarely-mixed part of the lake. Meanwhile, the shallow zone situated in the 0-3 m depth range, could be a sink for phosphorus during spring and a source during other seasons of the year. The total loading of phosphorus from the bottom sediments was over 950 kg year

Assessing within-lake nutrient cycling through multi-decadal Bayesian mechanistic modeling

2020 ◽  
Author(s):  
Daniel Obenour ◽  
Dario Del Giudice ◽  
Matthew Aupperle ◽  
Arumugam Sankarasubramanian
Keyword(s):  
Large Fraction ◽  
The United States ◽  
Internal Loading ◽  
Mechanistic Modeling ◽  
Balance Model ◽  
Nutrient Concentrations ◽  
Main Body ◽  
Sediment Layer ◽  
Concentration Data ◽  
Eutrophic Lakes

<p>Nutrient recycling from bottom sediments can provide substantial internal loading to eutrophic lakes and reservoirs, potentially exceeding external watershed loads. However, measurements of sediment nutrient fluxes are rare for most waterbodies in the United States, causing many modeling studies to parameterize these fluxes in simplistic ways or else make assumptions about complex sediment diagenetic rates. Here we propose an alternative approach to understanding internal cycling, using a mass-balance model combined with Bayesian inference to rigorously update prior information on nutrient flux parameters. The approach is applied to Jordan Lake, a major water supply reservoir in North Carolina (USA) that has been highly eutrophic since impoundment in the early 1980s, with chlorophyll a concentrations occasionally exceeding 100 µg/L. We simulate monthly nitrogen and phosphorus dynamics in the water column and sediment layer of four longitudinal reservoir segments, forced by watershed flows, nutrient loads, and meteorology. The model is calibrated within the Bayesian framework and validated using a multi-decadal record of surface nutrient concentration data. We compare multiple versions of the model to assess the importance of prior knowledge from previous literature, the multi-decadal calibration period, and the mechanistic formulation for obtaining accurate and robust predictive performance. Overall, the model explains from 40-60% of the variability in observed nutrient concentrations. Model results indicate that a large fraction (>40%) of phosphorus is lost in the upstream reaches of the reservoir, likely due to rapid settling and burial of particulate material. Within the main body of the reservoir, phosphorus recycling rates were found to be higher than expected a priori, particularly in the summer season. Results show how nutrients stored in lacustrine sediment have been an important source of internal loading to the reservoir for multiple decades, and will dampen the effects of external watershed loading reductions, at least in the near term. To better understand potential time scales for reservoir recovery, we perform future simulations over a multi-decadal period and characterize forecast uncertainties.</p>

Diatoms in bottom sediments of thermokarst lakes of the Pechora Delta

2019 ◽  
pp. 285-290
Author(s):  
Elvira A. Zinnatova, Larisa A. Frolova ◽  
Larisa A. Frolova
Keyword(s):  
Bottom Sediments ◽  
Environmental Conditions ◽  
Sources Of Information ◽  
Thermokarst Lakes ◽  
Thermokarst Lake ◽  
Fouling Organisms ◽  
Diatom Complexes

The Northern lakes are good objects for paleoclimatic reconstructions. One of the sources of information about changes in the ecosystems of lakes are diatoms. The study of diatom complexes revealed 133 taxa belonging to 49 genera, 24 families, 13 orders and 3 classes in the bottom sediments of the thermokarst lake of the Pechora Delta. Dominated by the Holarctic representatives of benthic and fouling organisms giving preference to the alkaline environmental conditions.

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