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Role of gestation delay in a plankton-fish model under stochastic fluctuations
B Mukhopadhyay1, R Bhattacharyya
1Department of Science, Central Calcutta Polytechnic, 21, Convent Road, Kolkata 700 014, India. banibrat001@yahoo.co.in
Abstract:
The present paper studies a minimal prey-predator model in the context of marine plankton interaction together with predation by planktivorous fish. The time lag required for gestation of the predator is incorporated and the resulting delayed model is analyzed for stability and bifurcation phenomena. A stochastic extension of the model is considered by perturbing the growth process of phytoplankton using colored noise process known to be more appropriate for the marine environment. The stochastic models with and without gestation delay are analyzed for stability aspects and a threshold value of gestation delay is obtained; this threshold is then compared with that of the deterministic model.
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