scholarly journals PERMISSIBLE NUTRIENT LOADINGS ON INTERNATIONAL LAKES

2021 ◽  
pp. 85
Author(s):  
Григорий Тевелевич Фрумин ◽  
Алексей Юрьевич Горелышев ◽  
Алексей Викторович Кулинкович ◽  
Grigory Frumin ◽  
Alexey Gorelyshev ◽  
...  
Keyword(s):  
Nutrient Loadings

scholarly journals Nutrient Loading, Temperature and Heat Wave Effects on Nutrients, Oxygen and Metabolism in Shallow Lake Mesocosms Pre-Adapted for 11 Years

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 127
Author(s):  
Erik Jeppesen ◽  
Joachim Audet ◽  
Thomas A. Davidson ◽  
Érika M. Neif ◽  
Yu Cao ◽  
...  
Keyword(s):  
Heat Wave ◽  
Shallow Lake ◽  
Nutrient Loading ◽  
Global Changes ◽  
Significant Positive Effect ◽  
Mixed Effect ◽  
Chl A ◽  
Nutrient Loadings ◽  
Positive Effect ◽  
Oxygen Concentrations

Global changes (e.g., warming and population growth) affect nutrient loadings and temperatures, but global warming also results in more frequent extreme events, such as heat waves. Using data from the world’s longest-running shallow lake experimental mesocosm facility, we studied the effects of different levels of nutrient loadings combined with varying temperatures, which also included a simulated 1-month summer heat wave (HW), on nutrient and oxygen concentrations, gross ecosystem primary production (GPP), ecosystem respiration (ER), net ecosystem production (NEP) and bacterioplankton production (BACPR). The mesocosms had two nutrient levels (high (HN) and low (LN)) combined with three different temperatures according to the IPCC 2007 warming scenarios (unheated, A2 and A2 + 50%) that were applied for 11 years prior to the present experiment. The simulated HW consisted of 5 °C extra temperature increases only in the A2 and A2 + 50% treatments applied from 1 July to 1 August 2014. Linear mixed effect modeling revealed a strong effect of nutrient treatment on the concentration of chlorophyll a (Chl-a), on various forms of phosphorus and nitrogen as well as on oxygen concentration and oxygen percentage (24 h means). Applying the full dataset, we also found a significant positive effect of nutrient loading on GPP, ER, NEP and BACPR, and of temperature on ER and BACPR. The HW had a significant positive effect on GPP and ER. When dividing the data into LN and HN, temperature also had a significant positive effect on Chl-a in LN and on orthophosphate in HN. Linear mixed models revealed differential effects of nutrients, Chl-a and macrophyte abundance (PVI) on the metabolism variables, with PVI being particularly important in the LN mesocosms. All metabolism variables also responded strongly to a cooling-low irradiance event in the middle of the HW, resulting in a severe drop in oxygen concentrations, not least in the HN heated mesocosms. Our results demonstrate strong effects of nutrients as well as an overall rapid response in oxygen metabolism and BACPR to changes in temperature, including HWs, making them sensitive ecosystem indicators of climate warming.

Assessment of nutrient loadings of a large multipurpose prairie reservoir

2017 ◽  
Vol 550 ◽  
pp. 166-185 ◽  
Author(s):  
L.A. Morales-Marín ◽  
H.S. Wheater ◽  
K.E. Lindenschmidt
Keyword(s):  
Nutrient Loadings

scholarly journals Chemical Properties and Nutrient Loadings of Rainwater during Farming Season

2013 ◽  
Vol 46 (5) ◽  
pp. 386-390 ◽  
Author(s):  
Min-Kyeong Kim ◽  
Seong-Chang Hong ◽  
Jong-Sik Lee ◽  
Goo-Buk Jung ◽  
Soon-Ik Kwon ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Nutrient Loadings

Modèle mathématique de gestion de la qualité de l'eau en rivière : application à l a rivière Yamaska

1982 ◽  
Vol 9 (4) ◽  
pp. 573-585 ◽  
Author(s):  
M. Pineau ◽  
J. P. Villeneuve ◽  
P. G. C. Campbell
Keyword(s):  
Water Quality ◽  
Quality Criterion ◽  
Optimal Strategies ◽  
Quality Parameter ◽  
Point Sources ◽  
Water Quality Parameter ◽  
Agricultural Activity ◽  
Phosphorus Pollution ◽  
Nutrient Loadings ◽  
Qualité De L’Eau

In the more populous watersheds of southern Quebec eutrophication of surface waters is a current problem, linked to excessive nutrient loadings from various municipal, industrial, and agricultural sources. A simple mathematical model has been developed to identify the optimal strategies for controlling nutrient loadings at various points in a river basin; for this optimization the key water quality parameter is phosphorus and the objective is to meet a fixed water quality criterion (0.06 mg total phosphorus per litre) at minimum cost.The potential utility of the model in a water management context has been demonstrated in a case study of the Yamaska River, Quebec, which drains regions of intense agricultural activity and is also subject to phosphorus pollution from numerous point sources of municipal and industrial origin.

scholarly journals Changes in the abundance of blue-green algae related to nutrient loadings in the nearshore of Lake Michigan

Hydrobiologia ◽  
1988 ◽  
Vol 157 (3) ◽  
pp. 271-278 ◽  
Author(s):  
William Y. B. Chang ◽  
Ronald Rossmann
Keyword(s):  
Green Algae ◽  
Lake Michigan ◽  
Blue Green Algae ◽  
Nutrient Loadings
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