Language evolution Brian O’Meara EEB464 Fall 2016.

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Language evolution Brian O’Meara EEB464 Fall 2016

Could languages evolve? A: Yes B: No

Could languages evolve through natural selection? A: Yes B: No

Gavin et al. 2013

Pagel 2009

The Austronesian language family is the one of the largest in the world, with around 1200 languages spread from Taiwan to New Zealand and Madagascar to Easter Island. We have constructed a large database of Austronesian basic vocabulary (23, 26), which stores 210 items of basic vocabulary from each language, including words for animals, kinship terms, simple verbs, colors, and numbers. Basic vocabulary is both relatively stable over time and generally less likely to be borrowed between languages (27). From this database, a team of linguists identified the sets of homologous words (“cognates”) following the linguistic comparative method (28). We extracted the cognate sets for 400 well-attested languages for analysis. These languages comprise a third of the entire family and include a representative sample of each recognized Austronesian subgroup. We included two non-Austronesian languages as outgroups to “root” the trees: an archaic variant of the Sino-Tibetan language Chinese that was spoken between 2300 and 2900 years B.P. and the Tai-Kadai language Buyang (28). These languages are not traditionally part of the Austronesian family, but a number of cognates have been identified (29). The cognate sets for all 210 meanings across these 400 languages were encoded into a binary matrix. Identified “borrowings” between languages were removed from further analyses. Simulation studies have shown that the amount of undetected borrowing needs to be very substantial (>20%) to substantially bias either the tree topology or the date estimates (30). The resulting matrix contained a total of 34,440 characters (twice the length of whole mitochondrial genomes), and 6436 of these characters were parsimony informative. Activity: figure out common words in multiple languages, put on board Gray et al. 2009

Gray et al. 2009

Pagel et al. 2013

Pagel et al. 2013

Pagel et al. 2013

Altschuler et al. 2013

Altschuler et al. 2013