Locating discontinuities along ecological gradients

TitleLocating discontinuities along ecological gradients
Publication TypeJournal Article
Year of Publication1987
AuthorsLudwig JA, Cornelius JM
Date Published1987
Accession NumberJRN00056
Call Number00189
Keywordsarticle, articles, ecological gradients, journal, journals, method, gradient-oriented transects, method, locating ecotones, method, sliding window, resource surveys, transect, ecotones

Cost-efficient ecological and natural surveys need: (1) flexible, logistically simple, and statistically sound sampling methods, and (2) sensitive, computationally simple, and ecologically robust data analysis methods. "Gradsects" (gradient-oriented transects) have recently been shown to be a more efficient sampling method than random sampling using nongradient-oriented transects, especially when surveying large, biologically diverse areas (Gillison and Brewer 1985). If biotic (e.g., vegetation) sampling is oriented along a defined environmental gradient, and the purpose is classification, then simple, efficient analysis techniques are needed. This note briefly reviews appropriate analysis techniques in order to identify ecotones or boundaries along gradsects.