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Reframing The Mammoth Steppe: Examining Mammoth Steppe Ecology Using Carbon And Nitrogen Isotopic Compositions Of Megafauna Collagen, Rachel E. Schwartz-Narbonne
Reframing The Mammoth Steppe: Examining Mammoth Steppe Ecology Using Carbon And Nitrogen Isotopic Compositions Of Megafauna Collagen, Rachel E. Schwartz-Narbonne
Electronic Thesis and Dissertation Repository
The Pleistocene mammoth steppe was a vast biome that stretched from northwestern Europe to central Canada. A diverse set of megaherbivore and megacarnivore species lived within this biome and there was significant ecosystem faunal and floral homogeneity. At the end of the Pleistocene, this biome disappeared, with the extinction or extirpation of many of the megafaunal species that inhabited it. This thesis reconstructs the ecology of the mammoth steppe using the isotopic compositions of carbon and nitrogen from megafaunal collagen. The reconstruction is done at a variety of ecological scales, beginning with individual animal- and season-specific isotopic studies of antlers, …
Stable Isotope Paleolimnology Of Barry Lake, Ontario, Canada Since Ad - 1268, Zijun Liu
Stable Isotope Paleolimnology Of Barry Lake, Ontario, Canada Since Ad - 1268, Zijun Liu
Electronic Thesis and Dissertation Repository
The paleolimnology of Barry Lake, SE Ontario, Canada is described using mineralogy, magnetic susceptibility, carbon:nitrogen ratio, mass accumulation rates, grain-size, δ18O and δ13C of authigenic calcite and mollusc aragonite, δ13C and δ15N of organic matter, and archival records. These sediments span the Medieval Warm Period (MWP), Little Ice Age (LIA), and human settlement. Interval I proxies (AD 1268-1350, MWP) indicate warmer and drier conditions and elevated lacustrine production. Interval II (AD 1350-1615) was cooler and wetter, with lower lacustrine production and low-oxygen conditions causing loss of shelly fauna. Interval III (AD 1615-1850, …