Modeling potential habitats for Gymnocarpus decanderusing multivariate statistical methods and logisticregression (Case study: Sistan and Baluchestan Province

Identification of habitats and suitable environmental conditions for the presence of various animal and plant species is one ofthe key issues in ecology and environment modeling. in iran, gymnocarpus decander species is the main and most abundantplant of the baluchi flora, especially in the rangeland areas. due to its high resistance to harsh environmental conditionsand salinity, this species can be useful for rangeland reclamation and restoration. in order to assess potential habitats of g.decander in sistan and baluchestan province, iran, this research was conducted in may 2020 using multivariate statisticalmethods including factor analysis, clustering and logistic regression. to do so, the map of real habitats of g. decander, wasmodeled using altitude and 62 climatic variables which were prepared using 24 meteorological stations across the provinceand neighboring. climatic variables were reduced to 5 factors using pca, including temperature, precipitation, radiation,dust and maximum temperature, which accounted for 88.3% of the climate change in the studied region. according to theregression models, the precipitation, temperature and altitude variables were the most significant independent variables(p < 0.05) which influence the potential habitats of g. decander in the study area. also, the study area was divided into 5groups (g1:g5). the results suggest that models are more accurate in homogeneous groups than in the whole region. thekappa coefficient and perdition accuracy had the highest and lowest values for g1 (68% and 88%) and g5 (19% and 59%),respectively. the results also showed that currently, 48.2% of the studied region has actual habitats. while the modelingresults based on the model of the whole region showed that the potential habitat area of this species was 52.3% and basedon the grouping models, it was 53.7%. therefore, based on differences between actual data and modeling result, 4.8% ofpotential habitats have no g. decander. also, results indicate that the g4 region with altitude range between 800−1250m, growth season mean temperature was about 16° c and annual precipitation about 170 mm was the main habitat for g.decander in sistan and baluchestan. according to the results of this study, g. decander is an endangered species and it isnecessary to plan long-term management to preserve and restore its habitats in the arid regions of southeastern iran.