Results 71 to 80 of about 25,230 (195)

Body Size Regulates Niche Overlap Asymmetry in the Subtropical Andes Rain Shadow: Isotopic Paleoecology of Oligocene South American Ungulates

Integrative Zoology, EarlyView.
This study provides the first isotopic analysis of Oligocene mammals from Quebrada Fiera, Mendoza, Argentina, filling a major gap in South American paleontology. It reveals a latitudinal gradient in aridity due to the Andean rain shadow and highlights the role of (semi)permanent water bodies in sustaining diverse herbivore communities. Additionally, it
Dánae Sanz‐Pérez, Santiago Hernández Del Pino, Esperanza Cerdeño, Manuel Hernández Fernández, Laura Domingo   +4 more
wiley   +1 more source

Tree-ring δ18O from an Alpine catchment reveals changes in glacier stream water inputs between 1980 and 2010

Arctic, Antarctic, and Alpine Research, 2019
The tree-ring stable carbon and oxygen isotope chronologies from two forest sites located in the Forni Glacier forefield (Italy)—one along the glacier stream (GL) and the other toward the valley slope (SL)—were analyzed with the aim of disentangling the ...
Giovanni Leonelli, Giovanna Battipaglia, Paolo Cherubini, Matthias Saurer, Rolf T.W. Siegwolf, Maurizio Maugeri, Barbara Stenni, Maria Letizia Fumagalli, Manuela Pelfini, Valter Maggi   +9 more
doaj   +1 more source

Low δ18O zircon grains in the Neoarchean Rum Jungle Complex, northern Australia: An indicator of emergent continental crust

, 2014
The timing of widespread continental emergence is generally considered to have had a dramatic effect on the hydrological cycle, atmospheric conditions, and climate.
Cross, A.J., Hollis, J., van Kranendonk, M.J., Kirkland, Chris, Armstrong, R.A., Allen, C., Kirkland, C.L., Cross, A., Hollis, J.A., Armstrong, R., Allen, C.M.   +10 more
core   +1 more source

Investigating relationships among strontium, barium, and seasonality in wild baboons

Archaeometry, EarlyView.
Abstract Geochemical profiles of Australopithecus africanus and baboon teeth show fluctuating trace elements, possibly reflecting seasonal diets. Here we use laser ablation–inductively coupled plasma–mass spectrometric measurements of calcium‐normalized strontium and barium ratios (Sr/Ca and Ba/Ca) and ion microprobe analyses of oxygen isotopes (δ18O ...
Maya Bharatiya, Christine Austin, Manish Arora, Janaína N. Ávila, Esme K. Beamish, Wendy Dirks, Daniel R. Green, Nicole D. Leonard, W. Scott McGraw, Larissa Swedell, Ian S. Williams, Jian‐xin Zhao, Tanya M. Smith   +12 more
wiley   +1 more source

Timing the Sacred: A Multi‐Step Chronological Framework for the Llullaillaco Inca Burial

Archaeometry, EarlyView.
ABSTRACT Absolute radiocarbon dating offers high precision, but its application to historical contexts, such as the Inca civilization, requires a rigorous methodological approach. This research examines methods to enhance chronological accuracy through a case study of artifacts from the Llullaillaco Capacocha sacrifice.
Dominika Sieczkowska‐Jacyna, Gabriela Recagno Browning, Mario Bernaski, Fernanda Zigaran, Maksymilian Jędrzejowski, Jacek Pawlyta, Andrzej Rakowski, Johan Reinhard, Sturt W. Manning, Dagmara Socha   +9 more
wiley   +1 more source

Holocene Hydroclimatic Reorganizations in Northwest Canada Inferred From Lacustrine Carbonate Oxygen Isotopes

Geophysical Research Letters, 2021
Sub‐centennial oxygen (δ18O) isotopes of ostracod and authigenic calcite from Squanga Lake provides evidence of hydroclimatic extremes and a series of post‐glacial climate system reorganizations for the interior region of northwest Canada.
G. Everett Lasher, Mark B. Abbott, Lesleigh Anderson, Lindsey Yasarer, Michael Rosenmeier, Bruce P. Finney   +5 more
doaj   +1 more source

Provisioning a Silk Road City: Herd Management Strategies at the Urban Site of Dzhankent, Kazakhstan

Archaeometry, EarlyView.
ABSTRACT This study presents evidence for herd management at the early medieval city of Dzhankent in southern Kazakhstan. Located along the Northern Silk Road, Dzhankent was a key trading node linking northern and southern areas between the 9th and 10th centuries ce.
Kara Larson, Iride Tomažič, A. Haruda, A. Tazhekeyev, S. Bilalov, H. Härke, I. Arzhantseva, Alicia R. Ventresca‐Miller   +7 more
wiley   +1 more source

Simple visualization of fish migration history based on high‐resolution otolith δ18O profiles and hydrodynamic models

Limnology and Oceanography Letters
Oxygen‐stable isotope (δ18O) in otoliths has been useful to infer marine fish migrations. However, because otolith δ18O is affected by two parameters, temperature and δ18O of ambient water, its interpretation becomes challenging when neither of them is ...
Tatsuya Sakamoto
doaj   +1 more source

Ion microprobe δ18O analyses to calibrate slow growth rate speleothem records with regional δ18O records of precipitation

, 2018
[EN]Paleoclimate reconstructions based on speleothems require a robust interpretation of their proxies. Detailed transfer functions of external signals to the speleothem can be obtained using models supported by monitoring data.
Domínguez Villar, David, Edwards, R. L., Krklec, Kristina, Lojen, Sonja, Cheng, Hai, Kozdon, Reinhard   +5 more
core   +1 more source

Analysis of δ18O in tree rings: Wood-cellulose comparison and method dependent sensitivity [PDF]

, 1999
During recent years, new on-line methods in mass spectrometry have been developed for measuring δ18O in organic material. They allow a much higher sample throughput than off-line methods with the result that sample preparation becomes the time-limiting ...
Borella, Silvio, Leuenberger, Markus, Saurer, Matthias   +2 more
core   +2 more sources