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2030-01-01
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TAPHONOMIC CONSIDERATIONS ON PINWORM PREVALENCE IN THREE ANCESTRAL PUEBLOAN LATRINES
Afiliación
Fundação Oswaldo Cruz. Escola Nacional de Saúde Pública Sergio Arouca. Rio de Janeiro, RJ, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia de Tripanosomatídeos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia de Tripanosomatídeos. Rio de Janeiro, RJ, Brasil.
University of Nebraska-Lincoln. School of Natural Resources. Pathoecology Laboratory. Lincoln, NE, USA.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia de Tripanosomatídeos. Rio de Janeiro, RJ, Brasil.
University of Nebraska-Lincoln. School of Natural Resources. Pathoecology Laboratory. Lincoln, NE, USA.
Resumen en ingles
For archaeological studies it is always necessary to consider taphonomic factors that could have influenced in
ancient material preservation. Parasite eggs are usually highly degraded in ancient sites dated from all periods of
time and taphonomic factors are mentioned to explain absence and low quantity of eggs found. In this study, we
compare parasite egg recovery of three Great House latrines: two from Aztec Ruins (Rooms 219 and 225) and
one from Salmon Ruins. We compared through statistical regression the recovery of eggs with the abundance of
two classes of decomposers: mites and nematodes. These microorganisms have relation with nematode larvae
and parasites remains degradation, respectively, mostly in moist environments. Pinworm was the only parasite
found in the sites studied. Prevalences were 32.8% at Salmon Ruins, 72.7% at Aztec Ruins Room 225 and 14.3%
at Room 219. Egg preservation was considered good at Salmon Ruins and Aztec Ruins Room 225. At Room 219,
the eggs were badly preserved and there was a significant statistical correlation with mites (multiple r
(18)=0.64/P=0.002). This correlation could indicate that mites could be involved in preservation, and
consequently that pinworm prevalence in this latrine is underestimated. Abiotic factors such as humidity could
have possibly favored the biological relation. Considering the extreme egg degradation at Room 219, it is not
possible to strictly compare parasite data with other Ancestral Pueblo sites, even with Room 225, located at the
same site. Room 225 prevalence is the highest found in Ancestral Pueblo sites until now. Taphonomic analysis
shows that decomposers operated at different levels of severity, despite the latrines' close location.
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