Bottom-up excitable models of phytoplankton blooms |
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Authors: | Amit?Huppert Ronen?Olinky Email author" target="_blank">Lewi?StoneEmail author |
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Institution: | (1) Biomathematics Unit, Department of Zoology, Tel Aviv University, Ramat-Aviv, Tel Aviv, 69978, Israel |
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Abstract: | A simple nutrient-phytoplankton model is used to explore the dynamics of phytoplankton blooms. The model exhibits excitable
behaviour in the sense that a large scale outbreak can only be triggered when a critical nutrient threshold is exceeded. The
model takes into account several features often neglected but whose combined effect proves very important: (i) rapid nutrient
recycling associated with the microbial loop and patch formation; (ii) self-shading; and (iii) a bottom-up approach, whereby
nutrient levels are responsible for both the triggering and the demise of the bloom. Although the literature is replete with
studies of ‘top-down’ models in which zooplankton grazing control the triggering and demise of the bloom, bottom-up models
are nevertheless appropriate in many circumstances. We provide a full mathematical investigation of the effects of these three
different features in an excitable system framework. |
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Keywords: | |
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