Fragmentation is a diversity ratchet
arXiv:2604.09966
Abstract
A fragmented landscape reduces the impact of interspecies connectivity, leading to higher diversity levels than otherwise possible in a connected landscape. Reconnecting a previously fragmented landscape initiates an extinction event, preferentially weeding out more highly connected species. A sequence of fragmentation-coalescence events will drive the ecosystem to higher levels of diversity in a ratchet-like effect, than if the landscape continuously remained connected.
Submitted to ALife 2026