Population Viability Analysis of the Endangered Roan Antelope in Ruma National Park, Kenya, and Implications for Management

Table 2

Demographic parameters of roans used by different PVA scenarios in comparison with the baseline model. All other parameters are the same as those listed in Table 1. The scenarios/management options are (1) reducing adult mortality; (2) reducing calf mortality; (3) reducing subadult mortality; (4) reducing effects of fire; (5) reducing effects of drought; (6) combined interventions; (7) restocking with current scenario; (8) protected sanctuary together with restocking. The values in bold are those different from the baseline model.

Demographic Parameter	Baseline model	Scenario 1	Scenario 2	Scenario 3	Scenario 4	Scenario 5	Scenario 6	Scenario 7	Scenario 8
Mortality
Calves	11%	11%	5%	11%	11%	11%	5%	11%	5%
Subadult	8%	8%	8%	5%	8%	8%	5%	8%	5%
Adult	21%	10%	21%	21%	21%	21%	10%	21%	10%
Number of breeding								4, 6,	3, 4, 6,
groups @ 12 roans	3	3	3	3	3	3	3	8 & 10	8 & 10
Carrying capacity (mean ± SE)	288 ± 20	288 ± 20	288 ± 20	288 ± 20	288 ± 20	288 ± 20	288 ± 20	288 ± 20	640
Multiplicative impacts of catastrophes
(i) Drought
(a) Frequency	20%	20%	20%	20%	20%	20%	20%	20%	20%
(b) Reproduction	10%	10%	10%	10%	10%	5%	5%	10%	5%
(c) Survival	15%	15%	15%	15%	15%	5%	5%	15%	5%
(ii) Fire
(a) Frequency	20%	20%	20%	20%	10%	20%	10%	20%	10%
(b) Reproduction	5%	5%	5%	5%	2%	5%	2%	5%	2%
(c) Survival	5%	5%	5%	5%	2%	5%	2%	5%	2%
(iii) Floods
(a) Frequency	10%	10%	10%	10%	10%	10%	5%	10%	5%
(b) Reproduction	0%	0%	0%	0%	0%	0%	0%	0%	0%
(c) Survival	15%	15%	15%	15%	15%	15%	10%	15%	10%