Ábrahám Levente (szerk.): Válogatott tanulmányok VI. - Natura Somogyiensis 19. (Kaposvár, 2010)

SALAMON-ALBERT É., HORVÁTH F., & ORTMANN-AJKAI A.: Climatic conditions and habitats in Belső-Somogy, Külső-Somogy and Zselic as vegetation-based landscape regions II. Temperature and precipitation sensitivity of woodlands

SALAMONALBERT ET AL.: CLIMATIC CONDITIONS AND HABITATS 53 Fig. 1: Study area in South Transdanubia, Hungary, with the three vegetation based landscape regions appearing in Somogy count)' geobotanical division of Europe, the regions are rated into the submontaneous oakhornbeam woodlands and thermophilous oak woodlands with open steppe oak woodlands and riparian vegetation (OZENDA and BOREL 2000). BIOCLIM variables For the sake of BIOCLIM calculation, monthly averages of climatic data were used, which were measured at weather stations on global and local scales. Temperature data are from the WorldClim database (http://www.worldclim.org/, HUMANS et al. 2005), precipitation data are from the local weather stations of Hungarian Meteorological Service (http://vissycd.glia.hu/atlasz.html, MERSICH et al. 2001). Set of selected variables are reported as the regional climatic surface and climatic envelope for potential habitat occurrence (Table 1). Calculation was carried out by the Institute of Ecology and Botany, Hungarian Academy of Sciences (Czúcz et al. 2007). Selected variables for the analyses are BIOCLIM1 the annual mean temperature, BIOCLIM-4 the annual temperature seasonality calculated as the standard deviation of monthly means x 100, BIOCLIM-8 the mean temperature of wettest quarter, BIOCLIM-9 the mean temperature of driest quarter, BIOCLIM12 the annual mean precipitation, BIOCLIM17 the precipitation of driest quarter, BIOCLIM18 the precipitation of warmest quarter, BIOCLIM19 the precipitation of coldest quarter. Annual data refer to monthly climate measurements from January to December, wettest quarter means data from June to August, driest quarter means data from January to March, warmest quarter means data from June to August, coldest quarter means data from December to February as the periods of three months, % of a year. Bioclimatic variables were calculated on a long-term (1961-1990) average monthly data and were used for defining climate surface and envelope of the region and climate