Reducing Nutrient Loading from Agriculture to Lake Ecosystems – Contributions of Resilience Principles

2020 ◽  
pp. 91-111
Author(s):  
Kate H. Reilly ◽  
Elena M. Bennett ◽  
Jan F. Adamowski ◽  
Gordon M. Hickey
Keyword(s):  
Nutrient Loading ◽  
Lake Ecosystems

Contribution of Solar Radiation to the Long-Term Dynamics of Hydro-Ecological Parameters of Lake Ecosystems under Variable Nutrient Loading: Case Study on Naroch Lakes

2021 ◽  
Vol 14 (1) ◽  
pp. 11-19
Author(s):  
T. I. Kazantseva ◽  
B. V. Adamovich ◽  
T. M. Mikheeva ◽  
T. V. Zhukova ◽  
R. Z. Kovalevskaya ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Nutrient Loading ◽  
Lake Ecosystems ◽  
Loading Case ◽  
Ecological Parameters

Have atmospheric emissions from the Athabasca Oil Sands impacted lakes in northeastern Alberta, Canada?

2008 ◽  
Vol 65 (8) ◽  
pp. 1554-1567 ◽  
Author(s):  
Roderick R.O. Hazewinkel ◽  
Alexander P. Wolfe ◽  
Sergi Pla ◽  
Chris Curtis ◽  
Kris Hadley
Keyword(s):  
Oil Sands ◽  
Nutrient Loading ◽  
Sediment Cores ◽  
Environmentally Benign ◽  
Lake Ecosystems ◽  
Complex Interactions ◽  
Ecological Understanding ◽  
Northeastern Alberta ◽  
Bitumen Extraction ◽  
Internal Nutrient Loading

The rate of bitumen extraction in northeastern Alberta, Canada, is outpacing the state of ecological understanding of the region, so that the extent of potential disturbances caused by atmospheric deposition remains largely unknown. Atmospheric SO2 emissions from the Fort McMurray region of Alberta (∼300 t·day–1) constitute ∼5% of the Canadian total. Combined with an estimated NOx production of ∼300 t·day–1, these emissions have the potential to acidify surface waters. Diatom assemblages in dated sediment cores from eight acid-sensitive lakes were analyzed to assess the effects of acidifying emissions on boreal lake ecosystems. There is no evidence that these lakes have become acidified. Instead, many of the lakes show characteristic changes towards greater productivity and occasionally greater alkalinity. The absence of evidence for acidification does not imply that emissions from the Oil Sands are environmentally benign, but rather suggests that the biogeochemistry of these lakes differs fundamentally from well-studied acidified counterparts in northern Europe and eastern North America. Complex interactions involving in-lake alkalinity production, internal nutrient loading, and climate change appear to be driving these lakes towards the new ecological states reported.

Management criteria for lake ecosystems applied to case studies of changes in nutrient loading and climate change

2003 ◽  
Vol 8 (2) ◽  
pp. 141-155 ◽  
Author(s):  
Lars Håkanson ◽  
Alexander Ostapenia ◽  
Arkady Parparov ◽  
K. David Hambright ◽  
Viktor V. Boulion
Keyword(s):  
Climate Change ◽  
Case Studies ◽  
Nutrient Loading ◽  
Lake Ecosystems

Stable states, buffers and switches: an ecosystem approach to the restoration and management of shallow lakes in the Netherlands

1998 ◽  
Vol 37 (3) ◽  
pp. 151-164 ◽  
Author(s):  
S. Harry Hosper
Keyword(s):  
The Netherlands ◽  
Lake Restoration ◽  
Nutrient Loading ◽  
Ecosystem Approach ◽  
Point Sources ◽  
Stable States ◽  
Lake Ecosystems ◽  
P Release ◽  
Water State ◽  
External P Loading

Lake restoration in the Netherlands has been focused mainly on the control of external P loading from point sources. However, this approach did not result in the water quality desired. The algae-dominated turbid water state may be extremely stable, and then additional measures are necessary to remove certain ‘blockages’ such as: the persistent bloom of Oscillatoria algae, the P release from the lake sediments, and the abundance of fish, preventing zooplankton and submerged macrophytes from developing. This paper addresses: (1) the need for an ecosystem approach, (2) the resistance of shallow lake ecosystems to changes in nutrient loading, (3) the concept of stable states, buffers and switches, and (4) the perspectives for lake restoration in the Netherlands. Priority should be given to fighting the Oscillatoria blooms. Winter flushing with water low in TP and algae proved to be an effective tool for reducing these blooms. Reduction of planktivorous fish, such as bream and roach, could enhance the top-down control of algae through the grazing by zooplankton, particularly by the large Daphnia species.

Land use and land cover changes in the catchments impact the ecosystem in Phewa, Begnas, and Rupa lakes, Nepal

2020 ◽  
Vol 60 ◽  
pp. 195-205
Author(s):  
Sudip Acharya
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Sedimentation Rate ◽  
Forest Cover ◽  
Nutrient Loading ◽  
Lake Ecosystem ◽  
Lulc Change ◽  
Lake Ecosystems ◽  
Agriculture Land ◽  
Physiochemical Parameters

Lakes are the environmental and socioeconomic assets of Nepal. In the past few decades, land use and land cover (LULC) change has severely altered the lake ecosystems. The sediment and nutrients loading into the lakes have altered lake ecosystem significantly. This study analyzes the spatiotemporal variations of LULC change and examines its impact on lake environment of Phewa, Begnas and Rupa lakes during 1975–2018 by using Landsat satellite images and data from published literatures. Results showed that from 1975 to 2018, forest cover and agriculture land in catchments of all three lakes has decreased, while the built-up area has increased. LULC change in the catchment have bought the significant impact on the lake environment in terms of sedimentation rate, physiochemical parameters and biological environment. From 1975 to 2000 forest cover in lakes catchment has decreased, whereas the agriculture land has increased. At the same time, sediment and agriculture based nutrient loading into lakes has increased indicated by changes in sedimentation rate and alteration of physiochemical properties of the lake. From 2000 to 2018, forest and built-up area has increased while the agriculture land has decreased in lakes catchment. From 2000 to 2018, sedimentation rate of lakes has decreased compared to before 2000. Decreased sedimentation rate was interpreted due to increase in forest cover in the lake catchment. Increased nutrients loading into the lake during 2000 to 2018 has resulted serious eutrophication problem in lakes. Overall, this study suggests that the LULC change in the catchment have significant impact on lake environment.

scholarly journals Multiple-Facet Diversity Patterns of Aquatic Vegetation in Lakes along a Trophic Gradient

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2281
Author(s):  
Dimitrios Zervas ◽  
Vasiliki Tsiaoussi ◽  
Athanasios S. Kallimanis ◽  
Panayotis Dimopoulos ◽  
Erwin Bergmeier ◽  
...  
Keyword(s):  
Aquatic Plant ◽  
Aquatic Vegetation ◽  
Nutrient Loading ◽  
Alpha Diversity ◽  
Diversity Indices ◽  
Trophic Levels ◽  
Trophic Gradient ◽  
Lake Ecosystems ◽  
Functional Richness ◽  
Richness Pattern

The EU Water Framework Directive foresees the ecological assessment of surface waters against identified pressures. Nutrient loading is the main pressure impairing the ecological quality of lake ecosystems, and aquatic macrophytes are considered good indicators of ecological response. In this study, we statistically assessed different aspects of aquatic plant (macrophyte) diversity in response to different trophic levels in Mediterranean lakes. We used 5690 relevés of aquatic vegetation, distributed over 305 transects, sampled in 18 freshwater lake ecosystems during 2013–2016. Our results show a significant decrease in taxonomic alpha diversity in lakes with a total phosphorus content above 100 μg/L. Syntaxonomic diversity followed the species richness pattern as well. Functional richness decreased along the trophic gradient, while functional dispersion was higher in lakes with high trophic levels. Taxonomic and functional beta partitioning presented changes in assembly processes leading to greater community homogeneity in lakes with higher trophic levels. In summary, we found no redundancy between taxonomic and functional diversity indices. These results provide novel insights into aquatic plant assembly processes of impacted freshwater lakes needed to forward conservation and restoration practices.

Consumer-dependent responses of lake ecosystems to nutrient loading

1994 ◽  
Vol 16 (11) ◽  
pp. 1567-1580 ◽  
Author(s):  
Asit Mazumder ◽  
David R.S Lean
Keyword(s):  
Nutrient Loading ◽  
Lake Ecosystems

Causes of ecosystem transformations variability in lakes of the european part of Russia and Western Siberia (diatom analysis)

2019 ◽  
pp. 79-82
Author(s):  
Lev V. Razumovsky
Keyword(s):  
Western Siberia ◽  
Graphical Analysis ◽  
European Part ◽  
Analysis Method ◽  
Climatic Region ◽  
Diatom Analysis ◽  
Lake Ecosystems ◽  
Distinctive Features ◽  
European Part Of Russia

On the basis of author's graphical analysis method, the typification of lake ecosystems transformation scenarios depending on the size of lakes was carried out. It was confirmed that the type of transformation depends not only on size of the lake, but also on the landscape and climatic region in which it is located. The distinctive features of lake ecosystems transformation types in the European part of Russia and in Western Siberia were analyzed and compared.

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