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Topographic influence on the distribution of Phytophthora ramorum

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Presentation on theme: "Topographic influence on the distribution of Phytophthora ramorum"β€” Presentation transcript:

1 Topographic influence on the distribution of Phytophthora ramorum
US Forest Service Topographic influence on the distribution of Phytophthora ramorum Chris Jones /25/2014

2 Phytophthora Ramorum Oomycete 2 types of diseases:
Canker (Sudden Oak Death) Foliar (Ramorum Blight)

3 Phytophthora Ramorum Hosts
Q. agrifolia Quercus agrifolia Rubus spectabilis Quercus kelloggii Aesculus californica Quercus parvula var. shrevei Rhamnus californica Quercus chrysolepis Rhamnus purshiana Lithocarpus densiflorus Corylus cornuta Arbutus menzeisii Lonicera hispidula Vaccinium ovatum Viburnum spp. Arctostaphylos spp. Toxicodendron diversilobum Rhododendron spp. Trientalis latifolia Umbellularia californica Sequoia sempervirens Acer macrophyllum Pseudotsuga menziesii Heteromeles arbutifolia U. californica L. densiflorus P. menziesii

4 P. Ramorum Range and Data
PRISM DEM 30 meter Interpolated FIA and CALVEG tree data P. ramorum plot data

5 Topographic Calculations
Elevation Fill π‘‡π‘ŠπΌ=𝐿𝑛 𝐹𝐴𝐢+1 βˆ—πΆπ‘’π‘™π‘™ 𝑆𝑖𝑧𝑒 π‘‡π‘Žπ‘› π‘ π‘™π‘œπ‘π‘’ Flow Direction Slope (Degrees) TWI = Topographic Wetness Index FAC = Flow accumulation Flow Accumulation TWI

6 Topographic Wetness

7 Potential Model Variables
RF Topographic Climate California laurel TWI Monthly Average PPT California live oak Slope Monthly Mean TMAX California black oak Elevation Monthly Mean TMIN redwood tanoak Pacific Madrone Douglas Fir

8 Significant Model Variables
Estimate Pr(>|t|) (Intercept) 2.139 0.022 TWI 0.008 TMAX3 -0.364 <0.001 TMAX8 -0.215 0.001 TMAX9 0.278 TMAX12 0.156 0.002 TMIN1 -0.318 0.048 TMIN2 0.380 PPT4 -0.004 0.044 PPT5 0.018 0.036 PPT7 -0.855 California Bay Laurel 0.501 0.030 AIC = Adj. R^2 = 0.456

9

10 Acknowledgements Aaron Moody Ross Meentemeyer David Tarboton
Oliver Lucas Jones

11 Questions

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