EOLSS - CHARACTERIZATION OF BIODIVERSITY
Table 6. Indices for beta-Diversity (β). For references, see Table 5.
Index |
Calculation |
Explanation |
Sörensen- (Jaccard-) Index [Sørensen 1948] |
β = 1 / Sø |
a = common species Arten, b = species in sample 1, c = species in sample 2 |
Whittaker [Whittaker 1960,1977] |
β = γ / α “ β = Sc / S(Ø) |
S(Ø) = average species number within samples, Sc = total number of speciesl |
Species turnover in half changes [Whittaker 1960,1977] |
β = (log R0 log Rn) / log 2 |
R0 = Similarity of species inventories from one site, Rn = Similarity of species inventories of extreme for the respective gradient |
ß-Turnover [Wilson & Shmida 1984] |
|
a, b = species number of sites to be compared; g, l = number of additional and lost“ species from one to the next site. |