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Non-linearities, synergisms and plant extinctions in South African fynbos and Australian kwongan
Authors:David M. Richardson  Richard M. Cowling  Byron B. Lamont
Affiliation:(1) Institute for Plant Conservation, Botany Department, University of Cape Town, Private Bag, 7700 Rondebosch, South Africa;(2) School of Environmental Biology, Curtin University of Technology, PO Box U1987, 6001 Perth, Australia
Abstract:
This paper explores the determinants of extinction of endemic plant taxa in mediterranean-climate regions in South Africa and southwestern Australia. Major threats to biodiversity in these areas include agriculture, deforestation, fragmentation, invasive alien organisms and urbanization. Case studies from the two regions show that synergisms between factors can lead to discontinuous, or non-linear, responses that have increased extinction rates (or threaten to) beyond predictions based on simple deterministic processes.
Keywords:non-linearities  synergisms  fynbos  kwongan  endemism  extinction  Proteaceae
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