Journal of Mathematical Biology

, Volume 77, Issue 3, pp 739–763

# Analysis of a model for banded vegetation patterns in semi-arid environments with nonlocal dispersal

• Lukas Eigentler
• Jonathan A. Sherratt
Article

## Abstract

Vegetation patterns are a characteristic feature of semi-arid regions. On hillsides these patterns occur as stripes running parallel to the contours. The Klausmeier model, a coupled reaction–advection–diffusion system, is a deliberately simple model describing the phenomenon. In this paper, we replace the diffusion term describing plant dispersal by a more realistic nonlocal convolution integral to account for the possibility of long-range dispersal of seeds. Our analysis focuses on the rainfall level at which there is a transition between uniform vegetation and pattern formation. We obtain results, valid to leading order in the large parameter comparing the rate of water flow downhill to the rate of plant dispersal, for a negative exponential dispersal kernel. Our results indicate that both a wider dispersal of seeds and an increase in dispersal rate inhibit the formation of patterns. Assuming an evolutionary trade-off between these two quantities, mathematically motivated by the limiting behaviour of the convolution term, allows us to make comparisons to existing results for the original reaction–advection–diffusion system. These comparisons show that the nonlocal model always predicts a larger parameter region supporting pattern formation. We then numerically extend the results to other dispersal kernels, showing that the tendency to form patterns depends on the type of decay of the kernel.

## Keywords

Pattern formation Nonlocal dispersal Semi-arid landscapes Integro-PDE model

## Mathematics Subject Classification

35R09 35B36 35C07

## Notes

### Acknowledgements

Funding was provided by Engineering and Physical Sciences Research Council (Grant No. EP/L016508/01), Scottish Funding Council, University of Edinburgh and Heriot-Watt University.

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© Springer-Verlag GmbH Germany, part of Springer Nature 2018

## Authors and Affiliations

• Lukas Eigentler
• 1
• Jonathan A. Sherratt
• 1
1. 1.Department of Mathematics, Maxwell Institute for Mathematical SciencesHeriot Watt UniversityEdinburghUK