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Newsgroups: sci.anthropology.paleo
From: "Marc Verhaegen" <Marc.Verhae...@village.uunet.be>
Date: 1998/05/04
Subject: Re: Neandertal snorkel
>Auditory exostosis is not proof of aquatic habits in Neandertals. It surely is. >The etiology of auditory exostosis is more complex than that. There's no doubt among ENT specialists that ear exostoses occur "exclusively >See Hutchinson, D.L. et al. 1997. A Reevaluation of the Cold Water >Etiology of External Auditory Exostosis. American Journal of Physical >Anthropology 103: 417-422. as a direct result of exposure to relatively cold water in swimmers" PH Rhys Evans 1992 J Laryng Otol 106:214-225. Hutchinson etc. don't question the cold water factor, but say it doesn't explain everything & discuss the mechanism of formation of AEs. This means AEs underestimate aquaticness, since AEs only develop in cold water <18°C & perhaps only in some predisposed persons. The presence of AEs proves diving habits, their absence does not. >Neither are their "dense" bones such proof. I said they're a strong indication. >Increased skeletal I mean denser bone plus thicker cortex - typically seen in slow divers like >robusticity (if that is what you mean by "dense") in general is a >response to increased mechanical loading of the bone. (Ruff, C.B. et >al. 1993. Postcranial Robusticity in Homo I: Temporal Trends and >Mechanical Interpretation. Am. J. Phys. Anth. 91: 21-53) walruses & sea-cows. Mechanical stress strengthens the bone & can explain localised hypertrophy (right arm in tennis players) but not the general denser bone & thicker cortex. Marc You must Sign in before you can post messages.
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