Reconciling Rubber Expansion with Biodiversity Conservation.

Area of Science:

• Ecology
• Conservation Biology
• Agricultural Science

Background:

• Rubber plantations have cleared over 5 million hectares of tropical forests in Asia and Africa.
• Rising rubber demand predicts further forest clearance, posing significant biodiversity risks.
• Reconciling rubber expansion with biodiversity conservation is a critical global challenge.

Purpose of the Study:

• To assess the feasibility of meeting future global rubber demand while conserving extinction-threatened species.
• To compare the spatial overlap between rubber suitability and species extinction vulnerability.
• To simulate rubber expansion scenarios and their biodiversity impacts.

Main Methods:

• Compared bioclimatic suitability for rubber cultivation with extinction vulnerability for amphibians, birds, mammals, and reptiles.
• Analyzed spatial congruence in Africa, Asia, and New Guinea.
• Simulated rubber expansion under various demand and conservation scenarios.

Main Results:

• No areas were identified with both high rubber suitability and low extinction vulnerability.
• Meeting projected rubber demand could be achieved primarily in New Guinea and African Guinea, regions with high biodiversity.
• Converting only cultivation-suitable areas would lead to major biodiversity losses; prioritizing conservation would minimize land conversion.

Conclusions:

• Compromise scenarios can reduce biodiversity losses by two-thirds, safeguarding most endangered species while maintaining high rubber suitability.
• Development of high-yielding rubber clones can increase potential "win-win" areas but also suitable areas with high extinction risk.
• Integrated strategies including clonal research, land-use policies, and impact assessments are crucial for sustainable rubber development.