Abstract
Phytoplankton is an important indicator organism to evaluate the quality of water environment, which may reflect the nutritional level of the sea area. Conversely, environmental conditions can directly affect the community structure of phytoplankton. A stochastic phytoplankton–zooplankton model considering non-degenerate and degenerate diffusions is formulated in this paper. What’s more, in both systems, we obtain sufficient conditions of extinction and ergodicity. Our results demonstrate that the weaker white noise can ensure the permanence of zooplankton and the stronger white noise can lead to the disappearance of zooplankton. Moreover, the threshold value of extinction and persistence can serve as a theoretical basis for controlling phytoplankton and zooplankton. Numerical examples are performed on the analysis results of the two cases to confirm our theoretical results. In addition, we also provide a real-life case study, the validity of the model is verified based on experimental data, and it is shown that fluctuation of external environment and the consumption of phytoplankton by zooplankton will affect the growth and number of phytoplankton. Effectively controlling the quantity of phytoplankton can delay the occurrence of water bloom or red tide.
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Acknowledgements
The research is supported by the Natural Science Foundation of China (No. 11871473), Shandong Provincial Natural Science Foundation (Nos. ZR2019MA010, ZR2019MA006) and the Fundamental Research Funds for the Central Universities (No. 19CX02055A).
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DJ designed the research and methodology. XM wrote the original draft. All authors read and approved the final manuscript.
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Mu, X., Jiang, D. & Alsaedi, A. Analysis of a Stochastic Phytoplankton–Zooplankton Model under Non-degenerate and Degenerate Diffusions. J Nonlinear Sci 32, 35 (2022). https://doi.org/10.1007/s00332-022-09787-9
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DOI: https://doi.org/10.1007/s00332-022-09787-9
Keywords
- Stochastic phytoplankton–zooplankton model
- Extinction
- Stationary distribution
- Ergodicity
- Markov semigroups