Journal Article

A delay differential equation model on harmful algal blooms in the presence of toxic substances

J. Chattopadhyay, R. R. Sarkar and A. el Abdllaoui

in Mathematical Medicine and Biology: A Journal of the IMA

Published on behalf of Institute of Mathematics and its Applications

Volume 19, issue 2, pages 137-161
Published in print June 2002 | ISSN: 1477-8599
Published online June 2002 | e-ISSN: 1477-8602 | DOI: http://dx.doi.org/10.1093/imammb/19.2.137
A delay differential equation model on harmful algal blooms in the presence of toxic substances

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The periodic nature of blooms is the main characteristic in marine plankton ecology. Release of toxic substances by phytoplankton species or toxic phytoplankton reduce the growth of zooplankton by decreasing grazing pressure and have an important role in planktonic blooms. A simple mathematical model of phytoplankton–zooplankton systems with such characteristics is proposed and analysed. As the process of liberation of toxic substances by phytoplankton species is still not clear, we try to describe a suitable mechanism to explain the cyclic nature of bloom dynamics by using different forms of toxin liberation process. To substantiate our analytical findings numerical simulations are performed and these adequately resemble the results obtained in our field study.

Keywords: phytoplankton; zooplankton; toxin; bloom; Hopf bifurcation

Journal Article.  0 words. 

Subjects: Applied Mathematics ; Biomathematics and Statistics

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