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“Why biodiversity is not homogenously distributed across the globe, but concentrated in certain regions, has fascinated biologists for centuries and has been the inspiration and focus of key ecological and evolutionary theories (Darwin 1859; Wallace 1860; Briggs 1988; Wiley 1988; Gaston 2001; Mutke and Barthlott 2005). For most taxa, species richness increases from the poles towards the equator. Also, regions covering long altitudinal gradients leading to high topographic and climatic heterogeneity (Possingham and Wilson 2005), as well as regions consisting of numerous true or habitat islands that stimulated speciation through isolation are prone to extraordinary species richness, as is the case of the Eastern Afromontane “mountain archipelago” along the Great Rift or the Indo-Malay biodiversity hotspot (Mittermeier et al. 2011).