DEVELOPMENT OF A SIMPLE BENTHIC-PELAGIC COUPLING ECOSYSTEM MODEL AND ITS APPLICATION TO THE REPRODUCTION OF 23YEARS OF WATER QUALITY

2018 ◽  
Vol 74 (4) ◽  
pp. I_511-I_516
Author(s):  
Toshiyuki TAKAO ◽  
Osamu SHIMOZAWA ◽  
Kazuo MURAKAMI ◽  
Ikuo ABE ◽  
Tomonari OKADA ◽  
...  
Keyword(s):  
Water Quality ◽  
Ecosystem Model ◽  
Benthic Pelagic Coupling

scholarly journals Exploring How Cyanobacterial Traits Affect Nutrient Loading Thresholds in Shallow Lakes: A Modelling Approach

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2467 ◽  
Author(s):  
Manqi Chang ◽  
Sven Teurlincx ◽  
Jan Janse ◽  
Hans Paerl ◽  
Wolf Mooij ◽  
...  
Keyword(s):  
Water Quality ◽  
Nitrogen Fixation ◽  
Shallow Lakes ◽  
Lake Restoration ◽  
Nutrient Loading ◽  
Ecosystem Model ◽  
Water Bodies ◽  
Cyanobacterial Blooms ◽  
Eutrophic Water ◽  
Modelling Approach

Globally, many shallow lakes have shifted from a clear macrophyte-dominated state to a turbid phytoplankton-dominated state due to eutrophication. Such shifts are often accompanied by toxic cyanobacterial blooms, with specialized traits including buoyancy regulation and nitrogen fixation. Previous work has focused on how these traits contribute to cyanobacterial competitiveness. Yet, little is known on how these traits affect the value of nutrient loading thresholds of shallow lakes. These thresholds are defined as the nutrient loading at which lakes shift water quality state. Here, we used a modelling approach to estimate the effects of traits on nutrient loading thresholds. We incorporated cyanobacterial traits in the process-based ecosystem model PCLake+, known for its ability to determine nutrient loading thresholds. Four scenarios were simulated, including cyanobacteria without traits, with buoyancy regulation, with nitrogen fixation, and with both traits. Nutrient loading thresholds were obtained under N-limited, P-limited, and colimited conditions. Results show that cyanobacterial traits can impede lake restoration actions aimed at removing cyanobacterial blooms via nutrient loading reduction. However, these traits hardly affect the nutrient loading thresholds for clear lakes experiencing eutrophication. Our results provide references for nutrient loading thresholds and draw attention to cyanobacterial traits during the remediation of eutrophic water bodies.

Estimation of water quality dynamics under long-term anoxic state in organically polluted reservoir by field observations and improved ecosystem model

2018 ◽  
Vol 16 (4) ◽  
pp. 665-686
Author(s):  
Tran Tuan Thach ◽  
Masayoshi Harada ◽  
Kazuaki Hiramatsu ◽  
Toshinori Tabata
Keyword(s):  
Water Quality ◽  
Ecosystem Model ◽  
Field Observations

Biologically driven variability in coastal carbon fluxes - A model study

2020 ◽  
Author(s):  
Harshal Chavan ◽  
Inga Hense
Keyword(s):  
Life Cycle ◽  
Carbon Fluxes ◽  
Ecosystem Model ◽  
Coastal Ocean ◽  
Relative Importance ◽  
The Baltic Sea ◽  
Model Study ◽  
Sudden Appearance ◽  
Benthic Pelagic Coupling ◽  
The Baltic

<p>Benthic-pelagic coupling is responsible for the sudden appearance and disappearance of many coastal plankton blooms. Whether this signature is also reflected in <em>p</em>CO<sub>2</sub> and whether the processes involved are important for the carbon fluxes in the coastal ocean is unclear. To address these questions, we use an ecosystem model that accounts for benthic-pelagic coupling of three different functional phytoplankton groups. Coupled with the water column model GOTM, we investigate the air-sea CO<sub>2</sub> fluxes in the Baltic Sea and compared them with observations. We show that the variability is very well captured by the model. The relative importance of the life cycle processes in regulating carbon fluxes is demonstrated.</p>

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