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The relative abundance of languages: Neutral and non-neutral dynamics

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  • Luís Borda-de-Água
  • Stephen P Hubbell

Abstract

Credible estimates suggest that a large number of the nearly 7000 languages in the world could go extinct this century, a prospect with profound cultural, socioeconomic, and political ramifications. Despite its importance, we still have little predictive theory for language dynamics and richness. Critical to the language extinction problem, however, is to understand the dynamics of the number of speakers of languages, the dynamics of language abundance distributions (LADs). Many regional LADs are very similar to the bell-shaped distributions of relative species abundance predicted by neutral theory in ecology. Using the tenets of neutral theory, here we show that LADs can be understood as an equilibrium or disequilibrium between stochastic rates of origination and extinction of languages. However, neutral theory does not fit some regional LADs, which can be explained if the number of speakers has grown systematically faster in some languages than others, due to cultural factors and other non-neutral processes. Only the LADs of Australia and the United States, deviate from a bell-shaped pattern. These deviations are due to the documented higher, non-equilibrium extinction rates of low-abundance languages in these countries.

Suggested Citation

  • Luís Borda-de-Água & Stephen P Hubbell, 2021. "The relative abundance of languages: Neutral and non-neutral dynamics," PLOS ONE, Public Library of Science, vol. 16(12), pages 1-13, December.
    • Handle: RePEc:plo:pone00:0259162
    DOI: 10.1371/journal.pone.0259162
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    References listed on IDEAS

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    1. William J. Sutherland, 2003. "Parallel extinction risk and global distribution of languages and species," Nature, Nature, vol. 423(6937), pages 276-279, May.
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