Simple predator–prey interactions control dynamics in a plankton food web model

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Title Simple predator–prey interactions control dynamics in a plankton food web model
Author Cropp, Roger Allan; Norbury, John
Journal Name Ecological Modelling
Year Published 2009
Place of publication Netherlands
Publisher Elsevier
Abstract A plankton food web model is analysed using interaction parameter values appropriate to the upper mixed layer of the high latitude oceans. The dynamics of this four-variable system are analysed in terms of the dynamics of much simpler two-variable predator–prey subsystems. Thus, the food web's robust, periodic, four-dimensional dynamics are explained by means of two-dimensional spirals and limit cycles. These dynamical subsystems are coupled by means of an omnivore that transfers control of the dynamics between the two predator–prey subsystems. The foodweb may substantially decouple the predator–prey subsystems so that the oscillating phytoplankton/zooplankton blooms exhibit population collapses when bacterial 'breathers' briefly dominate after growing dramatically fromlowbackground levels. This regular bloom/breather behaviour becomes benignly chaotic when the systemis mildly forced by the annual cycle of the sun's irradiance.
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Copyright Statement Copyright 2009 Elsevier B.V. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 220
Issue Number 13-14
Page from 1552
Page to 1565
ISSN 0304-3800
Date Accessioned 2009-06-15
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Ecosystem Function
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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