Changes in the suitable habitat of the smoke tree (Cotinus coggygria), a
species with an East Asian-Tethyan disjunction
Abstract
The smoke tree (Cotinus coggygria Scop.) is a woody species widely
distributed in the Mediterranean region and East Asia, and it has high
ecological, ornamental, and economic value. Investigating changes in the
suitable habitat in different historical periods and under climate
change in the future can provide key insights for understanding and
projecting changes in the distribution of Cotinus species. In this
study, we used a MaxEnt model to simulate the current, historical and
future suitable habitat for C. coggygria based on distribution records
of wild C. coggygria and environmental variables. The results showed
that C. coggygria had an East Asian-Tethyan disjunction, and the
suitable habitat was most affected by temperature and precipitation. At
the Last Glacial Maximum, C. coggygria in the Mediterranean retreated to
glacial refugia in southern Europe and survived in situ in East Asia.
Under future climate scenarios, the suitable habitat of C. coggygria
gradually expanded northward. As emission levels increased, the suitable
habitat for C. coggygria expanded northward. The overall suitable
habitat in the future was larger in the Mediterranean than in East Asia;
however, the highly suitable habitat was less in the Mediterranean than
in East Asia. The suitable habitat in the Mediterranean was greatly
affected by different scenarios, but this was not the case in East Asia.
The results of this study explored the effects of climate, soil, and
topographic variables on the suitable habitat for C. coggygria and
changes in the suitable habitat under historical and future climatic
situations. Our findings will aid the conservation and cultivation of C.
coggygria, as well as studies of species with discontinuous
distributions in Eurasia.