Catastrophic extinctions follow deforestation in Singapore

Area of Science:

• Ecology
• Conservation Biology
• Biodiversity Studies

Background:

• Tropical biodiversity is threatened by mass extinction events.
• Empirical data on tropical extinctions is scarce, with most reports being anecdotal.
• Habitat loss is a primary driver of biodiversity decline in these regions.

Purpose of the Study:

• To document local extinctions in Singapore due to extensive habitat loss.
• To quantify extinction rates across various taxa.
• To extrapolate these findings to predict future biodiversity loss in Southeast Asia.

Main Methods:

• Studied local extinctions in Singapore (540 km2) over 183 years.
• Assessed habitat loss exceeding 95%.
• Documented and inferred extinction rates for terrestrial and freshwater taxa.
• Utilized a calibrated species-area model for extrapolation.

Main Results:

• Substantial documented and inferred extinction rates were found, particularly for forest specialists.
• Butterflies, fish, birds, and mammals showed the highest proportion of extinct taxa (34-87%).
• Forest reserves (0.25% of area) now harbor over 50% of remaining native biodiversity.

Conclusions:

• Singapore experienced significant local extinctions due to habitat loss.
• Southeast Asia faces a potential loss of 13-42% of regional populations in the next century.
• Urgent conservation efforts are needed to mitigate global species extinctions.