The discovery of nearly periodic vegetation patterns in arid and semi-arid regions
motivated numerous model studies in the past decade. Most studies have focused on
vegetation pattern formation, and on the response of vegetation patterns to gradients of
the limiting water resource. The reciprocal question, what resource modifications are
induced by vegetation pattern formation, which is essential to the understanding of
dryland landscapes, has hardly been addressed. This paper is a synthetic review of model
studies that address this question and the consequent implications for inter-specific
plant interactions and species diversity. It focuses both on patch and landscape scales,
highlighting bottom-up processes, where plant interactions at the patch scale give rise to
spatial patterns at the landscape scale, and top-down processes, where pattern transitions
at the landscape scale affect inter-specific interactions at the patch scale.