Modeling Climate Refugia for Chengiodendron marginatum: Insights for Future Conservation Planning

Area of Science:

• Ecology
• Conservation Biology
• Climate Change Adaptation

Background:

• Chengiodendron marginatum is an evergreen tree/shrub in the Oleaceae family, a crucial germplasm resource for breeding.
• Understanding its adaptive responses to climate change is essential for effective conservation strategies.

Purpose of the Study:

• To investigate the changing patterns of potential suitable habitats for C. marginatum under various climate change scenarios.
• To identify critical climate refugia for the species' long-term survival.

Main Methods:

• Utilized maximum entropy (Maxent) modeling integrated with GIS spatial analysis.
• Employed current occurrence records and paleoclimatic data from mid-Holocene to future projections (2050s, 2070s).
• Assessed two contrasting climate scenarios: SSP126 (low emissions) and SSP585 (high emissions).

Main Results:

• The model achieved excellent predictive accuracy (AUC = 0.942), with precipitation variables being key distribution drivers.
• Current suitable habitats cover approximately 98.38 × 10^4 km^2, mainly in East, Central, and South China.
• Future projections indicate moderate habitat reduction and substantial decrease in high-suitability areas, with persistent refugia in southern Hainan, Taiwan, and northeastern Guangxi.

Conclusions:

• Climate change is projected to reduce suitable habitats for C. marginatum, particularly high-suitability areas.
• Southern Hainan, Taiwan, and northeastern Guangxi are identified as crucial climate refugia.
• Findings provide a basis for understanding species response to climate change and guiding conservation efforts.