Mostly in biogeography and plant ecology, the identification of the zones of greatest change in vegetation and associated abiotic/biotic factors; see Jacquez et al. in T. Poiker and N. Chrisman, eds (1998). Kent et al. (2006) PPG30, 2 are a model of clarity in discussing boundary detection. The extent to which geographically isolated regions support local diversification should predict the placement of biogeographical boundaries (Patten and Smith-Patten (2008) J. Biogeog. 35, 3).
Subjects: Earth Sciences and Geography.