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Teshekpuk Lake Observatory


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Graduate Student Research

Jeff Randall: Paleoecology, Master's Student, Alaska Pacific University (Advisor: Amanda Booth)

Photo of Jeff RandallProject Description: The ratio of Oxygen stable isotopes from precipitation have shown to be strongly correlated with air temperature. Precipitates formed in lakes can serve as a repository for these isotopes, giving insight into past temperatures. Insects in the family Chironomidae begin their lifecycle as midges in freshwater and synthesize a chitinous head capsule with the majority of oxygen atoms coming from lake water. As their lifecycle progresses this head capsule is molted and becomes deposited in the lake sediment. Jeff Randall, Alaska Pacific University, is extracting these head capsules from ˜6 m core from Teshekpuk Lake for analyses in an Isotope Ratio Mass Spectrometer to create a profile of temperature shifts for the region over the last ˜15,000 years. Jeff is also conducting pollen analysis on the lake sediment core to add to the multi-proxy analysis. This sediment core is the longest and oldest core retrieved from a lake on this portion of the Alaskan Arctic Coastal Plain and will fill a current gap in the overall understanding of past climate and environmental change in the region.


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Cody Roman Dial: Genetics, Master's Student, Alaska Pacific University

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