Additional file 14.

“Indirect gradient analysis is a powerful tool in community ecology to link species patterns to patterns of environmental variables including human disturbance. During a field mission to Ethiopia, I gave an introduction to gradient analysis for researchers at Jimma University, with whom we investigate the effects of coffee cultivation on the diversity and community structure of epiphytic orchids, birds and trees in evergreen moist Afromontane forests.” Attribution: Raf Aerts (Univeristy of Leuven).

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Harold et al. BMC Ecology 2013 13:6   doi:10.1186/1472-6785-13-6