Biodiversity and microclimatic divergence of chrysomelid beetles at 'Evolution Canyon', Lower Nahal Oren, Mt Carmel, Israel

Ninety species of leaf beetles (Chrysomelidae, Coleoptera, Insecta) were re corded from the 'Evolution Canyon' microsite (sample area 7000 m(2)), Lower Nahal Oren, Mt Carmel, Israel. species richness was significantly (P = 0.0 18) higher on the drier, climatically more fluctuating savanna-like, south- facing slope (SFS, 60 species, sample area 3000 m(2)) than on the cooler, w etter and climatically less variable north-facing slope (NFS, 44 species, s ample area 3000 m(2)), as in other terrestrial taxa. More species were foun d common to the local xeric SFS at the Canyon and the regional southern des ert areas (Judean nd Vegev Desserts), than to the NFS and Galilee Mountains , respectively, suggesting that local patterns mirror regional patterns. In terslope differences in microclimate variability range indicate than this f actor might be determinant of interslope species richness differences. Most species were collected in the spring (April; 47%) and least in the autumn (September; 3%) over the collecting period from March 1995 to June 1997. (C ) 2000 The Linnean Society of London.