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On the origin of tiger bush

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Abstract

We propose a model which describes the dynamics of vast classes of terrestrial plant communities growing in arid or semi-arid regions throughout the world. On the basis of this model, we show that the vegetation stripes (tiger bush) formed by these communities result from an interplay between short-range cooperative interactions controlling plant reproduction and long-range self-inhibitory interactions originating from plant competition for environmental resources. Isotropic as well as anisotropic environmental conditions are discussed. We find that vegetation stripes tend to orient themselves in the direction parallel or perpendicular with respect to a direction of anisotropy depending on whether this anisotropy influences the interactions favouring or inhibiting plant reproduction; furthermore, we show that ground curvature is not a necessary condition for the appearance of arcuate vegetation patterns. In agreement within situ observations, we find that the width of vegetated bands increases when environmental conditions get more arid and that patterns formed of stripes oriented parallel to the direction of a slope are static, while patterns which are perpendicular to this direction exhibit an upslope motion.

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Authors and Affiliations

  1. Service de Chimie-Physique, CP 231, Université Libre de Bruxelles, B-1050, Bruxelles, Belgium

    R. Lefever & O. Lejeune

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  1. R. Lefever
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  2. O. Lejeune
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Lefever, R., Lejeune, O. On the origin of tiger bush. Bltn Mathcal Biology 59, 263–294 (1997). https://doi.org/10.1007/BF02462004

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