Reconstructing Asian faunal introductions to eastern Africa from multi-proxy biomolecular and archaeological datasets

Mark Horton

Research output: Contribution to journalArticle (Academic Journal)

14 Citations (Scopus)

Abstract

Human-mediated biological exchange has had global social and ecological impacts. In sub-Saharan Africa, several domestic and
commensal animals were introduced from Asia in the pre-modern period; however, the timing and nature of these introductions
remain contentious. One model supports introduction to the eastern African coast after the mid-first millennium CE, while another
posits introduction dating back to 3000 BCE. These distinct scenarios have implications for understanding the emergence of longdistance
maritime connectivity, and the ecological and economic impacts of introduced species. Resolution of this longstanding
debate requires new efforts, given the lack of well-dated fauna from high-precision excavations, and ambiguous osteomorphological
identifications. We analysed faunal remains from 22 eastern African sites spanning a wide geographic and chronological range, and
applied biomolecular techniques to confirm identifications of two Asian taxa: domestic chicken (Gallus gallus) and black rat (Rattus
rattus). Our approach included ancient DNA (aDNA) analysis aided by BLAST-based bioinformatics, Zooarchaeology by Mass
Spectrometry (ZooMS) collagen fingerprinting, and direct AMS (accelerator mass spectrometry) radiocarbon dating. Our results
support a late, mid-first millennium CE introduction of these species. We discuss the implications of our findings for models of
biological exchange, and emphasize the applicability of our approach to tropical areas with poor bone preservation.
Original languageEnglish
JournalPLoS ONE
DOIs
Publication statusPublished - 17 Aug 2017

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