![]()
AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
|
|||||||
Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI În partea de jos este prezentat rezumatul articolului selectat. Pentru revenire la cuprinsul ediţiei din care face parte acest articol, se accesează linkul din titlu. Pentru vizualizarea tuturor articolelor din arhivă la care este autor/coautor unul din autorii de mai jos, se accesează linkul din numele autorului. |
|||||||
STUDIA GEOLOGIA - Ediţia nr.1 din 2007 | |||||||
Articol: |
STABLE ISOTOPE STUDIES OF PLIO-PLEISTOCENE FAUNA FROM DMANISI, GEORGIA. Autori: JULIA LEE-THORP. |
||||||
Rezumat: Establishing environmental context is crucial in human palaeontology because it provides both the essential contextual framework as well as clues to external influences, evolutionary drivers and trends. This is a particular issue with the first known hominins to have emerged beyond Africa approximately 1.75 Ma ago at the site of Dmanisi in Georgia. Morphologically the Dmanisi hominins, although variable, closely resemble the very earliest members of the genus Homo in Africa. The question then arises about how early humans, adapted over millions of years to tropical and savanna environments in Africa, coped with the temperate, harsher conditions of the southern Caucasus. We do not, however, understand the prevailing climate conditions in this part of the world very well, except for limited environmental information from the Eurasian faunal assemblage that suggests a mosaic of forest and open landscape. It has been suggested that possibly the ancient Dmanisi environment was warm enough to support some C4 savanna grasses. Here we show that this was not the case; based on stable carbon isotope analyses of ename, the floral cover was entirely C3, although there is a hint that this situation may have changed later. Although the distinguishing power of C3 and C4 flora is lacking, a combination of carbon and oxygen isotope ratios serves to distinguish the niches of some fauna. For instance the influence of closed forest habitats is suggested for bears, which have the lowest 13C/12C ratios. Preliminary high-resolution data from tooth crowns show that δ18O fluctuated by 3-4‰ seasonally, and small but patterned seasonal trends can be distinguished in δ13C amongst both grazing and browsing fauna. | |||||||
![]() |
|||||||