Deglaciation explains bat extinction in the Caribbean

Area of Science:

• Paleontology
• Island Biogeography
• Climate Change Science

Background:

• Ecological factors like climate change and competition are debated causes of Caribbean extinctions.
• Previous hypotheses lacked testing against a null model of climate-driven area loss.

Purpose of the Study:

• To test climate-driven postglacial area loss as a null model for Caribbean mammal extinctions.
• To model species loss as a function of sea-level-driven area changes.

Main Methods:

• Utilized a Quaternary mammal database and deep-sea bathymetry.
• Estimated species-area relationships (SARs) for Caribbean bats at present and during the Last Glacial Maximum (LGM).
• Modeled species loss based on inferred area loss from rising sea levels.

Main Results:

• Island area significantly predicted species richness across the Bahamas, Greater Antilles, and Lesser Antilles.
• Postglacial species losses in the Bahamas and Greater Antilles were largely explained by area loss from sea-level rise.
• Deviations from expected species richness were observed in the Bahamas and Greater Antilles, potentially due to sampling or ecological factors.

Conclusions:

• Changes in island area are crucial for understanding species richness patterns over time.
• The SAR serves as a vital null hypothesis for investigating extinction drivers.
• Further research is needed to explore ecological factors and sampling biases in extinction patterns.