by , 28 November 2011
Met with Stephen Pacala last week, who suggested we look into records of pollen sediments in lakes (varves) as potential data sources for early warning signals. Some potential sources:
A paper reviewing regime shifts in the pollen records:
- Drying period in N. American midwest look promising
- Williams, J. W., J. L. Blois, and B. N. Shuman. 2011. Extrinsic and intrinsic forcing of abrupt ecological change: case studies from the late Quaternary. Journal of Ecology 99:664-677. doi: 10.1111/j.1365-2745.2011.01810.x
Paper outlining dataset for N. American vegetation based on varve records:
- Williams, J. W., B. N. Shuman, T. Webb III, P. J. Bartlein, and P. L. Leduc. 2004. Late-Quaternary vegetation dynamics in North America: scaling from taxa to biomes. Ecological Monographs 74:309–334. Eco Soc America. doi: 10.1890/02-4045.
- Data is here, but this is the spatially interpolated set. The original varve data might be more useful.
Started a Mendeley group for this topic.