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COINCIDENT BIOGEOGRAPHIC PATTERNS: INDO-WEST PACIFIC OCEAN.
1Zoological Collections, Museum of Natural History, The University of Georgia, Athens, Georgia, 30602.
Summary
The East Indies is a hotspot for tropical marine species diversity and evolution. This region acts as a center for evolutionary radiation, driving speciation through large, genetically diverse populations.
Area of Science:
- Marine Biology
- Evolutionary Biology
- Biogeography
Background:
- The East Indies Triangle is known for high marine biodiversity.
- Species diversity generally decreases away from this region.
Purpose of the Study:
- To test the hypothesis that the East Indies is a center of evolutionary radiation.
- To identify patterns supporting this hypothesis in tropical marine families.
Main Methods:
- Comparative analysis of species distribution and diversity patterns.
- Examination of generic age, dispersal routes, and species characteristics.
Main Results:
- Species diversity peaks in the East Indies and declines outwards.
- The region shows youngest generic ages, origins of dispersal, highest apomorphy, and greatest genetic diversity.
- Extinctions also appear to originate from this area.
Conclusions:
- Coincident patterns strongly support the East Indies as a center of evolutionary radiation.
- Centrifugal speciation, driven by successful speciation in large, genetically diverse populations, is the likely mechanism.
- This aligns with the centrifugal speciation model proposed decades ago.
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