Diffusion-driven instabilities and emerging spatial patterns in patchy landscapes

Christina Cobbold, Frithjof Lutscher, Jonathan Adam Sherratt

Research output: Contribution to journalArticle

11 Citations (Scopus)
30 Downloads (Pure)

Abstract

Spatial variation in population densities across a landscape is a feature of many ecological systems, from self-organised patterns on mussel beds to spatially restricted insect outbreaks. It occurs as a result of environmental variation in abiotic factors and/or biotic factors structuring the spatial distribution of populations. However the ways in which abiotic and biotic factors interact to determine the existence and nature of spatial patterns in population density remain poorly understood. Here we present a new approach to studying this question by analysing a predator–prey patch-model in a heterogenous landscape. We use analytical and numerical methods originally developed for studying nearest-neighbour (juxtacrine) signalling in epithelia to explore whether and under which conditions patterns emerge. We find that abiotic and biotic factors interact to promote pattern formation. In fact, we find a rich and highly complex array of coexisting stable patterns, located within an enormous number of unstable patterns. Our simulation results indicate that many of the stable patterns have appreciable basins of attraction, making them significant in applications. We are able to identify mechanisms for these patterns based on the classical ideas of long-range inhibition and short-range activation, whereby landscape heterogeneity can modulate the spatial scales at which these processes operate to structure the populations.
Original languageEnglish
Pages (from-to)69-81
Number of pages13
JournalEcological Complexity
Volume24
Early online date14 Nov 2015
DOIs
Publication statusPublished - Dec 2015

Keywords

  • Diffusion-driven instability
  • Heterogeneous landscape
  • Patch model
  • Pattern formation
  • Predator–prey

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecological Modelling

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