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The origins and persistence of Homo floresiensis on Flores: biogeographical and ecological perspectives

Dennell, Robin W.; Louys, Julien Louys; O'Regan, Hannah J.; Wilkinson, David M.

Authors

Robin W. Dennell r.dennell@sheffield.ac.uk

Julien Louys Louys j.louys@uq.edu.au

Hannah J. O'Regan hannah.oregan@nottingham.ac.uk

David M. Wilkinson d.m.wilkinson@ljmu.ac.uk



Abstract

The finding of archaeological evidence predating 1 Ma and a small hominin species (Homo floresiensis) on Flores, Indonesia, has stimulated much research on its origins and ancestry. Here we take a different approach and examine two key questions – 1) how did the ancestors of H. floresiensis reach Flores and 2) what are the prospects and difficulties of estimating the likelihood of hominin persistence for over 1 million years on a small island? With regard to the first question, on the basis of the biogeography we conclude that the mammalian, avian, and reptilian fauna on Flores arrived from a number of sources including Java, Sulawesi and Sahul. Many of the terrestrial taxa were able to float or swim (e.g. stegodons, giant tortoises and the Komodo dragon), while the rodents and hominins probably accidentally rafted from Sulawesi, following the prevailing currents. The precise route by which hominins arrived on Flores cannot at present be determined, although a route from South Asia through Indochina, Sulawesi and hence Flores is tentatively supported on the basis of zoogeography. With regards to the second question, we find the archaeological record equivocal. A basic energetics model shows that a greater number of small-bodied hominins could persist on Flores than larger-bodied hominins (whether H. floresiensis is a dwarfed species or a descendent of an early small-bodied ancestor is immaterial here), which may in part explain their apparent long-term success. Yet the frequent tsunamis and volcanic eruptions in the region would certainly have affected all the taxa on the island, and at least one turnover event is recorded, when Stegodon sondaari became extinct. The question of the likelihood of persistence may be unanswerable until we know much more about the biology of H. floresiensis.

Journal Article Type Article
Publication Date Jul 15, 2014
Journal Quaternary Science Reviews
Print ISSN 0277-3791
Electronic ISSN 1873-457X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 96
APA6 Citation Dennell, R. W., Louys, J. L., O'Regan, H. J., & Wilkinson, D. M. (2014). The origins and persistence of Homo floresiensis on Flores: biogeographical and ecological perspectives. Quaternary Science Reviews, 96, doi:10.1016/j.quascirev.2013.06.031
DOI https://doi.org/10.1016/j.quascirev.2013.06.031
Keywords Flores; Homo floresiensis; Sulawesi; Rafting; Tsunamis
Publisher URL http://www.sciencedirect.com/science/article/pii/S0277379113002515
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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