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Pollen Representation of Vegetation Pattern in Woodrat Middens

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Presentation on theme: "Pollen Representation of Vegetation Pattern in Woodrat Middens"— Presentation transcript:

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

2 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

3 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.

4 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

5 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

6 Method Continued Vegetation Plots Midden 30 m

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

8 Hypotheses

9 Results

10 Results

11 Results

12 Results

13 Results

14 Results

15 Comparing?

16 Conclusion Something else? Noise Signal unsure Small regional signal

17 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

18 References Jackson, S.T., J. L. Betancourt, M.E. Lyford, S.T. Gray, and K.A. Rylander A 40,000-year woodrat-midden record of vegetational and biogeographical dynamics in north-eastern Utah, USA. Journal of Biogeography, 32, Lyford, M.E., S.T. Jackson, J.L. Betancourt, and S.T. Gray Influence of landscape structure and climate variability on a late Holocene plant migration. Ecological Monographs, 73(4), Lyford, M. E., S.T. Jackson, S.T. Gray, and R.G. Eddy Validating the use of woodrat (Neotoma) middens for documenting natural invasions. Journal of Biogeography, 31, Retrieved images from Retrieved images from description/desert_woodrat/ Retrieved images from Spring2008/Kiss/index.html Retrieved images from /28packrats.html

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

20 Questions? Questions?

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