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Complex dynamic of plankton–fish interaction with quadratic harvesting and time delay

The present paper deals with a food chain model consisting of three species phytoplankton, zooplankton and fish. We have divided the present paper into two parts. In the first part, we have assumed that the fish population is harvested using a non-linear harvesting function. Considering this rate of harvesting ‘E’ as a control parameter, we have estimated different ranges of...

The effect of an external toxicant on a biological species in case of deformity: a model

Classification 34 C60 92D25 93A30 4 & Anuj Kumar Agarwal In this paper, a mathematical model is proposed and analyzed to study the effect of an external toxicant on a biological species. Here, we have considered