Ecological Archives E093-086-A1

Fangliang He. 2012. Area-based assessment of extinction risk. Ecology 93:974–980.

Appendix A. The relationship between occupancies before population removal (p) and after removal (pc) for the 302 species in the 50 ha BCI plot, Panama and the 348 land bird species of the North American Breeding Bird Survey.

Fig. A1. Random removal: p-pc relationships for three levels of population reduction (c = 80%, 50%, and 30%) and three different spatial scales (a = 10 × 10, 25 × 25, and 50 × 50 m). Dots are the occupancies of the 302 species in the 50-ha BCI, Panama. The relationships are presented in arithmetic (a) and log-log scale (b). Red curves are Eq. 1, while the blue lines are the linear approximation: pc = (1 - c)p.


Fig. A2. Systematic removal: p-pc relationships for three levels of population reduction (c = 80%, 50%, and 30%) at three different spatial scales (a = 10 × 10, 25 × 25, and 50 × 50 m). Dots are the occupancies of the 302 species in the 50-ha BCI, Panama. The relationships are presented in arithmetic (a) and log-log scale (b). Red curves are Eq. 1, while the blue lines are the linear approximation: pc = (1 - c)p.


Fig. A3. p-pc relationships for 348 land bird species in North American Breeding Bird Survey at three levels of population reduction (c = 80%, 50%, and 30%). The relationships are presented in arithmetic (a) and log-log scale (b). Red curves are Eq. 1, while the blue lines are the linear approximation: pc = (1 - c)p. Both random removal (a) and systematic removal (b) of populations are shown.


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