What determines the distribution of Tulipa species in Uzbekistan?

Although the distribution of Tulipa species in Uzbekistan is well documented, there is no clear understanding of the importance of three classes of environmental variables, namely climate, soil type and topography, as determinants of their distribution. In this study we mapped the richness of Tulipa species across Uzbekistan and conducted species distribution modeling in order to analyze the relative contribution of climate, soil type and topography to their predicted suitable ranges. Occurrence records were compiled from herbarium collections and from field surveys carried out between 2015 and 2021. Climate was the major determinant of species distribution for the majority of the analyzed species; topography, expressed as slope angle and aspect, was equally or even more important for several narrowly distributed taxa.

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