Pollen Representation of Vegetation Pattern in Woodrat Middens

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Presentation transcript:

Pollen Representation of Vegetation Pattern in Woodrat Middens By Danielle Marie Reed With Dr. Stephen T. Jackson

Introduction How well does pollen preserved in woodrat middens represent vegetation? Fossil Woodrat Middens Focus: Modern Woodrat Middens, Neotoma Dr. Mark Lyford and Dr. Stephen Jackson—vegetation data Alkali Creek Midden DJM Fossil Midden West Carrizo Canyon Modern Midden

Vegetation Study In 2000, Dr. Mark Lyford and Dr. Stephen Jackson collected vegetation plots and woodrat middens Northeastern Utah, Western Wyoming, Southeastern Colorado, and Southeastern Montana.

Research Focus Comparing pollen data with the surrounding vegetation data 30 m radius 5 different sites Fremont Canyon Sheep Creek Canyon Dutch John Mountain Alkali Creek Inferno Canyon

Method Modern Middens Total of 59 middens collected Fremont Canyon 5/13 Sheep Creek Canyon 5/11 Dutch John Mountain 5/11 Alkali Creek 2/5 Inferno Canyon 5/19 Total of 59 middens collected Count 22 random samples http://www.digitalsmicroscope.com/microscope-images-2/

Method Continued Vegetation Plots Midden 30 m http://www.bio.davidson.edu/people/vecase/behavior/Spring2008/Kiss/index.html

Method Continued Count 300 pollen grains from 22 samples Determine percent composition Compare to vegetation percentages within a 30 m radius

Hypotheses

Results

Results

Results

Results

Results

Results

Comparing?

Conclusion Something else? Noise Signal unsure Small regional signal

Conclusion How does pollen get into a midden? Why not a stronger Wind Attached to plant debris Other? Why not a stronger signal? Introduce different sites Northeastern Colorado http://www.aquariumofpacific.org/onlinelearningcenter/full_description/desert_woodrat/

References Jackson, S.T., J. L. Betancourt, M.E. Lyford, S.T. Gray, and K.A. Rylander. 2005. A 40,000-year woodrat-midden record of vegetational and biogeographical dynamics in north-eastern Utah, USA. Journal of Biogeography, 32, 1085-1106. Lyford, M.E., S.T. Jackson, J.L. Betancourt, and S.T. Gray. 2003. Influence of landscape structure and climate variability on a late Holocene plant migration. Ecological Monographs, 73(4), 567-583. Lyford, M. E., S.T. Jackson, S.T. Gray, and R.G. Eddy. 2004. Validating the use of woodrat (Neotoma) middens for documenting natural invasions. Journal of Biogeography, 31, 333-342. Retrieved images from http://www.digitalsmicroscope.com/microscope-images-2/ Retrieved images from http://www.aquariumofpacific.org/onlinelearningcenter/full_ description/desert_woodrat/ Retrieved images from http://www.bio.davidson.edu/people/vecase/behavior/ Spring2008/Kiss/index.html Retrieved images from http://www.geo.arizona.edu/palynology/geos462 /28packrats.html

Special Thanks Dr. Stephen Jackson Dr. Mark Lyford Jennifer Andersen Jackson’s Lab

http://www.geo.arizona.edu/palynology/geos462/28packrats.html Questions? Questions?