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Climate-Induced Shifts in Alpine Diatom Communities: Linking Neoecological and Paleoecological Approaches to Incorporate Responses to Trophic Forcing

Personnel

Principal investigators: Jasmine Saros, Craig Williamson (Miami U of Ohio), Jeffery Stone (U of Nebraska-Lincoln), Lisa Graumlich and Greg Pederson (both from U of Arizona).

Paddle on Beauty Lake

Project summary

Diatom fossils from lake sediments in the central and northern Rocky Mountains indicate that various Cyclotella species have increased during the 20th century. This increase is often attributed to climate change, but the mechanisms involved here have not yet been tested. To decipher the mechanisms by which climate change has altered diatom community structure, we are coupling paleoecological analyses with experimental approaches. Fossil records from lake sediments are being used along with tree rings to provide information on climate trends over the last 2,000 years. A series of laboratory and field experiments are also being used to assess the mechanisms by which climate-related parameters drive changes in these diatoms.

This research is being conducted in the Beartooth Mountains (central Rockies) as well as Glacier National Park (northern Rockies).

Cyclotella bodanica

Retrieving an experiment on Emerald Lake

Travel by horseback on cliffs to get to Rainbow Lake

 

The field team on the hike to Glacier and Emerald

Craig hard at work