Language trees support the express-train sequence of Austronesian expansion.

Area of Science:

• Computational linguistics
• Evolutionary biology
• Archaeology

Background:

• Linguistic evolution parallels biological evolution, with concepts like common ancestry and convergent evolution applicable to both.
• Phylogenetic methods, widely used in biology, have been infrequently applied to linguistic data.
• Understanding the Austronesian expansion is crucial for Pacific history.

Purpose of the Study:

• To apply phylogenetic methods to linguistic data for evolutionary analysis.
• To test the 'express-train' and 'entangled-bank' models of Austronesian expansion.
• To reconstruct the historical migration patterns of Austronesian-speaking peoples.

Main Methods:

• A parsimony analysis was conducted on a dataset of 77 Austronesian languages.
• The dataset comprised 5,185 lexical items.
• The 'express-train' model was mapped as a geographical character onto the resulting language tree.

Main Results:

• The analysis yielded a single, most-parsimonious tree representing linguistic relationships.
• The generated language tree topology showed high compatibility with the 'express-train' model.
• This suggests a sequential, geographically ordered migration pattern.

Conclusions:

• Phylogenetic analysis is a viable method for studying linguistic evolution and historical migrations.
• The findings provide strong support for the 'express-train' model of Austronesian expansion.
• This research offers new insights into the peopling of the Pacific.