Indirect gradient analysis - Alaska Geobotany Center

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Czenkanowski s index of similarity Czekanowski s coefficient (IS c ) is a modification of Sorenson s similarity index that considers the abundance (cover) of species: ISc = m 2 min( xi, yi) i=1 m i =1 x i + m yi i =1 Where the numerator is the sum of minimum cover value for each species (i) in each pair of plots (x, y). The denominator is the sum of the cover values for all species in stand x plus the sum of the cover values for all species in stand y.
Similarity and dissimilarity for plots 2 and 9 Plots Species 1 2 3 4 5 6 7 8 9 10 Quercus 9 8 3 5 6 5 macrocarpa Quercus velutina 8 9 8 7 Carya ovata 6 6 2 7 1 Prunus serotina 3 5 6 6 6 4 5 4 1 Quercus alba 5 4 9 9 7 7 4 6 2 Juglans nigra 2 3 5 6 7 3 Quercus rubra 3 4 6 9 8 7 9 4 3 Juglans cinerea 5 2 2 2 Ulmus americana 2 2 4 5 6 5 2 5 Tilia americana 2 7 6 6 7 6 Ulmus rubra 4 2 2 5 7 8 8 8 7 Carya cordiformis 5 6 4 3 Ostrya virginiana 7 4 6 5 Acer saccharum 5 4 8 8 9 Total 38 42 ISc = 2 min( xi, yi) i=1 m IS 2,9 = 2(0+0+0+4+0+0+4+0+2+0+0+0+0+0) 38+42 Similarity = 20/80 = .25 m i =1 x i + m yi i =1 Dissimilarity = 1-Is c = 1-.25 = .75
Page 1 and 2: Lesson 18 Ordination II: Indirect g
Page 3 and 4: Vegetation Ecosystem Environmental
Page 5 and 6: Indirect gradient analysis • “I
Page 7 and 8: Plot ordinations vs. species ordina
Page 9 and 10: 1-, 2-, and 3-dimensional plot ordi
Page 11 and 12: Species ordination Species ordinati
Page 13 and 14: Relating the plot ordination to env
Page 15 and 16: Polar ordination • Developed by B
Page 17 and 18: Steps in calculation of the ordinat
Page 19: Jaccard s and Sorenson s similarity
Page 23 and 24: Step 2. Matrices of similarities an
Page 25 and 26: Calculation of x values along the 1
Page 27 and 28: Geometric determination of plots al
Page 29 and 30: Step 4. Define the second axis and
Page 31 and 32: Plotting the ordination Bray and Cu
Page 33 and 34: Polar ordination weaknesses and adv
Page 35 and 36: Example of isoline diagrams from Ba
Page 37 and 38: Example of Biplot Diagram from Anja
Page 39 and 40: Relating the ordination to environm
Page 41 and 42: Other ordination methods • Princi
Page 43 and 44: Summary • Oridination is based on

Indirect gradient analysis - Alaska Geobotany Center

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