A statistical dynamics model of the marine ecosystem and its application in Jiaozhou Bay

2011 ◽  
Vol 29 (4) ◽  
pp. 905-911 ◽  
Author(s):  
Honghua Shi ◽  
Zongling Wang ◽  
Guohong Fang ◽  
Wei Zheng ◽  
Long Hu
Keyword(s):  
Marine Ecosystem ◽  
Jiaozhou Bay ◽  
Dynamics Model ◽  
Statistical Dynamics

scholarly journals Influences of Nutrient Sources on the Alternation of Nutrient Limitations and Phytoplankton Community in Jiaozhou Bay, Southern Yellow Sea of China

2020 ◽  
Vol 12 (6) ◽  
pp. 2224
Author(s):  
Jie Shi ◽  
Qian Leng ◽  
Junying Zhu ◽  
Huiwang Gao ◽  
Xinyu Guo ◽  
...  
Keyword(s):  
Atmospheric Deposition ◽  
Phytoplankton Community ◽  
Inorganic Nitrogen ◽  
Marine Ecosystem ◽  
Jiaozhou Bay ◽  
Nutrient Concentrations ◽  
River Input ◽  
Aquaculture Wastewater ◽  
The 1960S ◽  
Yellow Sea Of China

A marine ecosystem box model was developed to reproduce the seasonal variations nutrient concentrations and phytoplankton biomasses in Jiaozhou Bay (JZB) of China. Then, by removing each of the external sources of nutrients (river input, aquaculture, wastewater discharge, and atmospheric deposition) in the model calculation, we quantitatively estimated its influences on nutrient structure and the phytoplankton community. Removing the river input of nutrients enhanced silicate (SIL) limitation to diatoms (DIA) and decreased the ratio of DIA to flagellates (FLA); removing the aquaculture input of nutrients decreased FLA biomass because it provided less dissolved inorganic nitrogen (DIN) but more dissolved inorganic phosphate (DIP) as compared to the Redfield ratio; removing the wastewater input of nutrients changed the DIN concentration dramatically, but had a relatively weaker impact on the phytoplankton community than removing the aquaculture input; removing atmospheric deposition had a negligible influence on the model results. Based on these results, we suppose that the change in the external nutrients sources in the past several decades can explain the long-term variations in nutrient structure and phytoplankton community. Actually, the simulations for the 1960s, 1980s, and 2000s in JZB demonstrated the shift of limiting nutrients from DIP to SIL. A reasonable scenario for this is the decrease in riverine SIL and increase in DIP from aquaculture that has reduced DIA biomass, promoted the growth of FLA, and led to the miniaturization of the phytoplankton.

Assessment of cumulative impacts and coastal ecosystem health in the JiaoZhou Bay

2020 ◽  
Author(s):  
Ziyuan Hu ◽  
Murray Logan ◽  
XiaoXia Sun ◽  
Richard Brinkman ◽  
Song Sun
Keyword(s):  
Ecosystem Health ◽  
Marine Ecosystem ◽  
Jiaozhou Bay ◽  
Experimental Studies ◽  
Health Assessment ◽  
The Yellow Sea ◽  
Coastal Pollution ◽  
Ecosystem Monitoring ◽  
Ecosystem Health Assessment ◽  
The Impact

<p>Coastal areas are under compounding pressures from urbanization, industrialization, infrastructure growth, and aquaculture.  There is hence an urgent need for developing solutions for coastal pollution and ecosystem safety. In this work, based on our long-term and multidisciplinary ecosystem monitoring data, we develop tools to translate the observing data into management information to sustainable coastal use and development. From the existing data and experimental studies, we develop approaches to understand key processes and factors controlling coastal ecosystems and to define thresholds and guidelines values of ecological parameters to determine. With focus on marine ecosystem health assessment, we use the integrating data to describe ecosystem condition, its potential trend and the impact of existing pressures. This present study initially focused on the coastal area of the Yellow Sea, in the JIAOZHOU Bay. The technique of the structured research can be applied to other coastal regions as well to understand how these ecosystems respond to local and global pressures.</p>

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