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Experimental data on net photosynthetie rate change of lichens in response to temperature and water stress were collected and standardized. The method of nonuniform hierarchical structured data interpolation was applied to assess lichen sensitivity to climatic stress for species and territories where sensitivity has not been measured in a laboratory. The alternative method of lichen sensitivity to climatic stress assessment is the analysis of species ranges, abundance, and occurrence. This approach is especially effective for areas with a manifest climatic gradient and where multiple floristic zone boundaries occur. Assessments of sensitivity of the Negev Desert lichens to long-term temperature increase were obtained using the second approach.

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