Potential impact of climate change on the distribution and conservation status of Pterocarpus marsupium, a Near Threatened South Asian medicinal tree species

Climate change is considered as an important environmental issue globally, affecting geographic distributions of endangered species, and reducing the extent of their natural habitats. We characterized the potential geographic distribution of a Near Threatened tree species, Pterocarpus marsupium, in South Asia. We evaluated the potential geographic distribution of the species under present and future conditions using ecological niche modeling ap-proaches. The future potential distribution of the species was examined under two representative concentration pathway scenarios (RCP 4.5 and 8.5), using outputs from 8 general circulation models for 2050. The present-day distribution of the species covers much of India and Sri Lanka, and parts of Nepal and Bhutan. Model transfers for future-climate conditions indicated a potentially dramatic geographic shift of high-suitability areas for parts of the species' distribution, particularly in central India. In distributional areas that are adjacent to high-mountain areas, under climate change, suitable areas for the species are anticipated to shift towards higher elevations. The results of this study may be useful in identifying currently undocumented populations of P. marsupium, as well as in identifying sites likely to be suitable both at present and in the future for conservation management planning.

Automated summary

This study used ecological niche modeling to investigate the potential geographic distribution of the Near Threatened tree species Pterocarpus marsupium in South Asia and its potential changes under climate change. The results indicated a significant geographic shift in suitable areas for the species under future climate conditions.