Revising the Bantu Tree
Cladistics Cladistics (2018) 1–20 10.1111/cla.12353 Revising the Bantu tree Peter M. Whiteleya, Ming Xuea and Ward C. Wheelerb,* aDivision of Anthropology, American Museum of Natural History, 200 Central Park West, New York, NY, 10024-5192, USA; bDivision of Invertebrate Zoology, American Museum of Natural History, 200 Central Park West, New York, NY, 10024-5192, USA Accepted 15 June 2018 Abstract Phylogenetic methods offer a promising advance for the historical study of language and cultural relationships. Applications to date, however, have been hampered by traditional approaches dependent on unfalsifiable authority statements: in this regard, historical linguistics remains in a similar position to evolutionary biology prior to the cladistic revolution. Influential phyloge- netic studies of Bantu languages over the last two decades, which provide the foundation for multiple analyses of Bantu socio- cultural histories, are a major case in point. Comparative analyses of basic lexica, instead of directly treating written words, use only numerical symbols that express non-replicable authority opinion about underlying relationships. Building on a previous study of Uto-Aztecan, here we analyse Bantu language relationships with methods deriving from DNA sequence optimization algorithms, treating basic vocabulary as sequences of sounds. This yields finer-grained results that indicate major revisions to the Bantu tree, and enables more robust inferences about the history of Bantu language expansion and/or migration throughout sub-Saharan Africa. “Early-split” versus “late-split” hypotheses for East and West Bantu are tested, and overall results are com- pared to trees based on numerical reductions of vocabulary data. Reconstruction of language histories is more empirically based and robust than with previous methods.
[Show full text]