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THE BIOGEOGRAPHIC EVIDENCE SUPPORTING THE PLEISTOCENE FOREST REFUGE HYPOTHESIS
1Museum of Comparative Zoology, Harvard University, Cambridge, MA, 02138.
Summary
The Pleistocene refuge hypothesis, explaining tropical biodiversity, is supported by new analysis. Evidence indicates species contact zones align with predicted forest refuges, challenging recent critiques.
Area of Science:
- Ecology
- Evolutionary Biology
- Biogeography
Background:
- The Pleistocene refuge hypothesis posits that glacial cycles fragmented tropical forests, isolating populations and driving speciation.
- Recent challenges question refuge hypothesis predictions regarding contact zone locations and widths.
- Critiques suggest contact zones should lie between refuges and vary with species' reproductive rates.
Purpose of the Study:
- To re-evaluate the evidence for the Pleistocene refuge hypothesis.
- To address critiques regarding the location and width of species contact zones.
- To provide further support for the refuge hypothesis based on empirical data.
Main Methods:
- Reanalysis of existing data on African bird contact zones.
- Assessment of data precision for determining contact zone widths.
- Examination of endemism patterns and allopatric distributions within postulated refuges.
Main Results:
- Data imprecision prevents definitive conclusions on contact zone widths.
- Reanalysis confirms African bird contact zones occur between predicted refuges.
- Endemism and allopatry provide additional strong support for the refuge hypothesis.
Conclusions:
- The Pleistocene refuge hypothesis remains a robust explanation for tropical biodiversity patterns.
- Critiques based on current data are not conclusively supported.
- Further evidence from endemism and allopatry strengthens the refuge hypothesis.
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