Table 1. Habitat-specific diffusion coefficients, preferences and drift speeds.
Diffusion coefficient | % Habitat availability | % Habitat use | Normalised preference | Drift speed | |
Rocky grounds | 350 (20) | 40 | 18 | 0.096 | 16 (75) |
Galleries | –– (0) | 2 | 1 | 0.149 | 13 (2) |
Annuals | 320 (61) | 47 | 53 | 0.237 | 9 (204) |
Perennials | 220 (21) | 11 | 28 | 0.518 | 6 (86) |
Most habitat-specific diffusion coefficients (expressed in m2/min) were computed from too few couples of consecutive track segments (sample sizes between parentheses) to be reliable. Both habitat availability (non-weighted proportion of each habitat type) and use (UD-weighted proportion of each habitat type) were computed on the areas encompassed within 95% isopleths (see Fig. 1). Normalised preferences correspond to habitat use/availability ratios subject to unit-sum constraint. Drift speeds values (expressed in m/min) should be considered with extreme caution when computed from only a few track segments.