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Self-organised spatial patterns and chaos in a ratio-dependent predator–prey system

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Abstract

Mechanisms and scenarios of pattern formation in predator–prey systems have been a focus of many studies recently as they are thought to mimic the processes of ecological patterning in real-world ecosystems. Considerable work has been done with regards to both Turing and non-Turing patterns where the latter often appears to be chaotic. In particular, spatiotemporal chaos remains a controversial issue as it can have important implications for population dynamics. Most of the results, however, were obtained in terms of ‘traditional’ predator–prey models where the per capita predation rate depends on the prey density only. A relatively new family of ratio-dependent predator–prey models remains less studied and still poorly understood, especially when space is taken into account explicitly, in spite of their apparent ecological relevance. In this paper, we consider spatiotemporal pattern formation in a ratio-dependent predator–prey system. We show that the system can develop patterns both inside and outside of the Turing parameter domain. Contrary to widespread opinion, we show that the interaction between two different type of instability, such as the Turing–Hopf bifurcation, does not necessarily lead to the onset of chaos; on the contrary, the emerging patterns remain stationary and almost regular. Spatiotemporal chaos can only be observed for parameters well inside the Turing–Hopf domain. We then investigate the relative importance of these two instability types on the onset of chaos and show that, in a ratio-dependent predator–prey system, the Hopf bifurcation is indeed essential for the onset of chaos whilst the Turing instability is not.

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Notes

  1. Interestingly, Fig. 12 shows remarkable similarity to panel 4 in Fig. 2 in Baurmann et al. (2007) (where the corresponding dynamics was also branded as chaotic), although their interpretation of the underlying mechanism was completely different.

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Authors and Affiliations

  1. Department of Mathematics and Statistics, Indian Institute of Technology Kanpur, Kanpur, 208016, India

    Malay Banerjee

  2. Department of Mathematics, University of Leicester, Leicester, LE1 7RH, UK

    Sergei Petrovskii

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  1. Malay Banerjee
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  2. Sergei Petrovskii
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Correspondence to Sergei Petrovskii.

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Banerjee, M., Petrovskii, S. Self-organised spatial patterns and chaos in a ratio-dependent predator–prey system. Theor Ecol 4, 37–53 (2011). https://doi.org/10.1007/s12080-010-0073-1

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