Existence of periodic solutions to a non-autonomous allelopathic phytoplankton model with fear effect

Satyam Narayan Srivastava , Alexander Domoshnitsky , Seshadev Padhi , Rana D. Parshad , John R. Graef

Electronic Research Archive ›› 2026, Vol. 34 ›› Issue (2) : 723 -737.

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Electronic Research Archive ›› 2026, Vol. 34 ›› Issue (2) :723 -737. DOI: 10.3934/era.2026033
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Existence of periodic solutions to a non-autonomous allelopathic phytoplankton model with fear effect
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Abstract

The authors considered a non-autonomous allelopathic phytoplankton competition model that incorporates the influence of fear effects that are often observed in natural biological phenomena. Based on Mawhin’s coincidence degree theory, sufficient conditions for the existence of periodic solutions were obtained. The authors validated their findings with an example and simulations showing that the constant coefficient case leads to dynamics that are neither steady state nor T-periodic, while the periodic coefficient case generates sustained T-periodic oscillations.

Keywords

allelopathy / phytoplankton / competition model / fear effects / existence of periodic solutions / coincidence degree theory

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Satyam Narayan Srivastava, Alexander Domoshnitsky, Seshadev Padhi, Rana D. Parshad, John R. Graef. Existence of periodic solutions to a non-autonomous allelopathic phytoplankton model with fear effect. Electronic Research Archive, 2026, 34 (2) : 723-737 DOI:10.3934/era.2026033

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