Table 3.

Results of the VORTEX PVA model for roan antelopes simulated over 100 years under alternative management options.

Management option	r	SD (r)	PE (%)	N	SD (N)	TE (years)
Baseline (no action)	−0.074	0.186	100	0	0	32
Restocking with 4 groups (option 7a)	−0.07	0.185	100	0	0	36
Restocking with 6 groups (option 7b)	−0.07	0.178	100	0.01	0	42
Restocking with 8 groups (option 7c)	−0.071	0.173	99.9	0.01	0.19	45
Restocking with 10 groups (option 7d)	−0.07	0.171	99.8	0.02	0.22	48
Reduced fire severity (option 4)	−0.055	0.178	99.2	0.12	1.41	43
Reduced drought severity (option 5)	−0.044	0.164	97.2	1.05	2.77	53
Calf mortality 5% (option 2)	−0.061	0.183	99.9	0	0.06	38
Subadult mortality 5% (option 3)	−0.068	0.185	99.9	0	0.06	35
Adult mortality 10% (option 1)	0.001	0.134	13.7	66.37	49.27	>100
Combined interventions (option 6)	0.023	0.099	0.2	248.3	31.58	>100
Protected sanctuary with current population of 3 groups (option 8a)	0.043	0.095	0	582.13	62.76	>100
Protected sanctuary with 4 groups (option 8b)	0.043	0.096	0	586.38	64.12	>100
Protected sanctuary with 6 groups (option 8c)	0.042	0.095	0	586.27	65.38	>100
Protected sanctuary with 8 groups (option 8d)	0.041	0.095	0	588.45	56.91	>100
Protected sanctuary with 10 groups (option 8e)	0.041	0.094	0	590.99	61.08	>100

NB: r and SD (r) = population growth rate and its standard deviation; PE (%) = mean probability of extinction; N and SD (N) = mean population size and its standard deviation; TE = median time to extinction, in years.