. The Canadian field-naturalist. 1999 Catling and Brownell: Ontario Plateau Alvars 571. Alvar study sites Figure I. Southern Ontario showing locations of 57 Ontario plateau alvars included in the classi- fication study. Contours show relationships between major groups portrayed in UPGMA clustering of sites based on Jaccard's coefficient (Figure 2) and those portrayed in the prin- cipal coordinate analysis with minimum spanning tree (Figure 3). on average taxonomic distance coefficients from lati- tude and longitude data, (4) physiographic regions from Chapman and Putnam (1984. page 113), (5) c
. The Canadian field-naturalist. 1999 Catling and Brownell: Ontario Plateau Alvars 571. Alvar study sites Figure I. Southern Ontario showing locations of 57 Ontario plateau alvars included in the classi- fication study. Contours show relationships between major groups portrayed in UPGMA clustering of sites based on Jaccard's coefficient (Figure 2) and those portrayed in the prin- cipal coordinate analysis with minimum spanning tree (Figure 3). on average taxonomic distance coefficients from lati- tude and longitude data, (4) physiographic regions from Chapman and Putnam (1984. page 113), (5) cli- mate regions from Brown et al. (1980, page 8), (6) climate based on nine major groups from a UPGMA phenogram derived from a matrix of coefficients of average taxonomic distance based on five climatic variables including growing degree days, July aver- age temperature, January average temperature, sum- mer precipitation and snow cover, (7) site districts employed by the Ontario Ministry of Natural Resources (Riley et al. 1997), (8) ecoregions based on the National Ecological Framework for Canada (Ecological Stratification Working Group 1995), (9) plant hardiness zones from Land Resource Research Centre, Agriculture Canada (1991), and finally (10) site regions employed by the Ontario Ministry of Natural Resources (Riley et al. 1997). Table 2. Grouping variables and their corresponding F-ratios for five principal coordinate axes from analysis of species presence data in 57 alvars using Jaccard's coeffcients. Grouping Co-ordinate Axes Values Sum of F-ratios No. of Variable 1 -> 3 4 5 Divisions Flora 9 Catling95 5 Geography 9 Physiographic 10 Climate Regions 6 Climate -5 Types 9 Site Districts 8 Ecoregions () ()
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