Spatial Variation of Modern Pollen in Oregon and Southern Washington, USA.
Thomas Minckley and Cathy Whitlock (2000).
Review of Palaeobotany and Palynology, 112: 97-123.
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Figure
1.
The
distribution of modern pollen samples collected in Oregon and Washington,
excluding samples from the Olympic Peninsula ((£)
Heusser 1969, 1973, 1978a, 1978b, 1978c; (D)
Mack and Bryant 1974; Mack et al. 1978; (0)
This study), and the physiographic provinces of the Pacific Northwest ((1)
Olympic Peninsula, (2) Coast Range, (3) Klamath Mountains, (4) Puget
Trough, (5) Willamette Valley, (6) Cascade Range, (7) Okanogan Highlands,
(8) Columbia Basin, (9) Blue Mountains, (10) High Lava Plains, (11) Basin
and Range, (12) Owyhee Uplands), after Franklin and Dyrness (1988). |
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Figure 2. Arrangement of vegetation zones from east to west at lat. 45ºN and lat. 43ºN, from Franklin and Dyrness, 1988. |
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Table 1. The range and distribution of the vegetation zones in Oregon and southern Washington based on Franklin and Dyrness (1988). Representative major and minor taxa, mean annual temperature (MAT), and mean annual precipitaiton (MAP) are listed for each zone. |
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Table 2. Information on lake study sites. |
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Table 3. Vegetation at sites collected in this study. |
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Table 4. Modern pollen samples in each vegetation zone. |
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Table 5. Pollen type and climate variable loadings for DCA and PCA axes 1 and 2; types denoted with an asterisk were used for the pollen-environment comparisons. |
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Figure 3. The pollen percentages of selected taxa arranged by vegetation zone and increasing elevation. Site names are given in Table 2. |
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Figure 4a. Variations of pollen percentages among and within the vegetation zones of Oregon and southern Washington. Vegetation zone abbreviations are Pisi (Picea sitchensis), Tshe (Tsuga heterophylla), Abam (Abies amabilis), Tsme (Tsuga mertensiana), TRLN (Treeline/Alpine), INVA (Interior Valley), Artr (Shrub-Steppe), Juoc (Juniperus occidentalis), Pipo (Pinus ponderosa), Abgr (Abies grandis), and Abla (Abies lasiocarpa). Boxplots show the 25th and 75th percentiles of the pollen percentage data, and the vertical line denotes the median value. The X’s represent the individual pollen percentages from lakes within each vegetation zone. The boxplots are independently scaled to show variation of each pollen type within each vegetation zone. |
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Figure 4b. Variations of pollen percentages among and within the vegetation zones of Oregon and southern Washington. Vegetation zone abbreviations are Pisi (Picea sitchensis), Tshe (Tsuga heterophylla), Abam (Abies amabilis), Tsme (Tsuga mertensiana), TRLN (Treeline/Alpine), INVA (Interior Valley), Artr (Shrub-Steppe), Juoc (Juniperus occidentalis), Pipo (Pinus ponderosa), Abgr (Abies grandis), and Abla (Abies lasiocarpa). Boxplots show the 25th and 75th percentiles of the pollen percentage data, and the vertical line denotes the median value. The X’s represent the individual pollen percentages from lakes within each vegetation zone. The boxplots are independently scaled to show variation of each pollen type within each vegetation zone. |
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Figure 5a. Scatter diagrams (MINITAB 1998) showing the abundance of selected pollen types plotted against environmental variables. LOWESS curves show the locally weighted regression of the relationship of pollen to climatic variables. LOWESS curves were created with a 3-step window and 0.7 degree of smoothing. |
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Figure 5b. Scatter diagrams (MINITAB 1998) showing the abundance of selected pollen types plotted against environmental variables. LOWESS curves show the locally weighted regression of the relationship of pollen to climatic variables. LOWESS curves were created with a 3-step window and 0.7 degree of smoothing. |
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Figure 6. The ranges of modern pollen percentages collected from lake surface (0), moss polster (£), and soil samples (D) from the Pacific Northwest in the Picea sitchensis (Pisi), Tsuga heterophylla (Tshe), Abies amabilis (Abam), Tsuga mertensiana (Tsme), Treeline/Alpine (TRLN), Interior Valley (INVA), Shrub-Steppe (Artr), Juniperus occidentalis (Juoc), Pinus ponderosa (Pipo), Abies grandis (Abgr), and Abies lasiocarpa (Abla) zones. |