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Islands are engines of language diversity
Lindell Bromham1, Keaghan J Yaxley2, Marcel Cardillo2
1Macroevolution and Macroecology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, Australia. Lindell.Bromham@anu.edu.au.
Nature Ecology & Evolution
|September 5, 2024
Summary
Islands foster remarkable language diversity, with endemic languages increasing with both size and isolation. Island languages show fewer sounds as isolation grows, suggesting islands accelerate language evolution and diversification.
Area of Science:
- Linguistics
- Evolutionary Biology
- Island Biogeography
Background:
- Islands are crucial in evolutionary and ecological theory for understanding biodiversity.
- Despite 1/6th of world languages being island-based, their diversity is unexplained.
- Islands (<11,000 km²) host 10% of global endemic languages.
Purpose of the Study:
- To investigate the role of islands in global language diversity.
- To test theories of language evolution and diversity in island contexts.
- To understand how island area and isolation influence language characteristics.
Main Methods:
- Construction of a global island language database.
- Analysis of language diversity, endemism, and risk of loss.
- Correlation of linguistic features (phoneme count) with island area and isolation.
Main Results:
- Island language diversity increases with area but not consistently with isolation.
- Endemic language counts rise with both island area and isolation.
- Island endemic languages exhibit fewer phonemes with increased isolation.
Conclusions:
- Islands significantly shape language evolution and diversification.
- Isolation and area are key factors in the development of unique island languages.
- Islands act as unique environments that accelerate language change and create diversity.
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