Table 3: Estimated parameters of alternative evolutionary models which have been fitted onto the evolution of extinction risk for endemic birds of China.

ModelsLog-likelihood ParametersAIC

Delta−63.12−1.490.527128.24
LinearChange−63.11−0.6172.27128.22
TwoRate−60.73−0.47B = 0.013, E = 72.20125.46
Null−63.171.09126.34

: breakpoint; : the second rate; denotes the equal transition rate among the categories of extinction risk. AIC: Akaike Information Criteria.