Electronic Thesis and Dissertation Repository


Master of Science




Dr. Fred Longstaffe


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, LIA) was colder, with lower lacustrine production beginning at AD 1720, coincident with European activity beginning at AD 1830. Interval IV (AD 1850-2011) is marked by rising temperature and lacustrine production, declining human impact, and since AD ~1950, new nitrogen input (fertilizer?). These data provide a baseline for future change in climatic and anthropogenic factors affecting Barry Lake.

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