Science and Technology Production
Congress
Authorship
Zarza, María Macarena
;
Larsen, T.
;
Lamenza, G. N.
;
DEL PAPA, LUIS MANUEL
;
van der Lubbe, J.
Date
2025
Publishing House and Editing Place
Jesium
Summary
Information provided by the agent in
SIGEVA
The South American Gran Chaco, a vast region spanning over one million km², currently lacks region-specific paleoclimatic models. To evaluate the validity of models extrapolated from neighboring regions, we conducted zooarchaeological studies on environmentally sensitive species. This work analyzes stable carbon (δ13C) and oxygen (δ18O) isotope variations in archaeological and modern shells of Pomacea canaliculata. Whole-shell analyses provide estimates of annual climatic condi...
The South American Gran Chaco, a vast region spanning over one million km², currently lacks region-specific paleoclimatic models. To evaluate the validity of models extrapolated from neighboring regions, we conducted zooarchaeological studies on environmentally sensitive species. This work analyzes stable carbon (δ13C) and oxygen (δ18O) isotope variations in archaeological and modern shells of Pomacea canaliculata. Whole-shell analyses provide estimates of annual climatic conditions, while intra-shell analyses reveal seasonal variations, establishing the first isotopic baseline for this species in the region. These studies have refined our understanding of climatic periods and complemented morphogeometric analyses of Lepidosiren paradoxa and Hoplosternum littorale, offering an independent assessment of seasonality and environmental conditions at archaeological sites. The integration of isotopic and zooarchaeological data has enabled evaluation of the proposed model´s reliability. Furthermore, isotopic analyses have revealed humidity and temperature fluctuations at varioustemporal scales, enhancing our understanding of resource seasonality stability and its relationship with long-term climate variability. This approach has also facilitated assessment of extraordinary events such as Mega ENSO on local ecology and human occupation patterns. Our study demonstrates the value of combining multiple lines of evidence in paleoclimatic and archaeological investigations, introducing newmethodologies for reconstructing the Gran Chaco´s climatic and environmental history.
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Key Words
CLIMATE VARIABILITYISOTOPIC ANALISYSGRAN CHACO