Table 2 Minimum viable population in carrying capacity (MVPk) and minimum area of critical habitat (MACH) estimates for the PRD humpback dolphins.
−5% mortality | Stationary | +5% mortality | |||||
|---|---|---|---|---|---|---|---|
(a) VORTEX | (b) IBSM | (c) VORTEX | (d) IBSM | (e) VORTEX | (f) IBSM | ||
MVPk | Estimate | 752 | 675 | 2039 | 1932 | 7490 | 8036 |
95% C.I. | 729–777 | 655–697 | 1973–2112 | 1872–1998 | 7191–7825 | 7736–8370 | |
MACH # (km2) | Estimate | 1089.9 | 978.3 | 2955.1 | 2800.0 | 10855.1 | 11646.4 |
Range | 1056.5–1126.1 | 949.3–1010.1 | 2859.4–3060.9 | 2713.0–2895.7 | 10421.7–11340.6 | 11211.6–12130.4 | |
- Scenarios: stationary population (c,d), −5% adult mortality (a,b) and +5% adult mortality (e,f). Models used: VORTEX model (a,c,e) and individual-based stage model (IBSM) (b,d,f).
- #MACH was calculated as
where D is the population density estimate from Chen et al.46 that averages 0.690 animals-km−2 across all survey areas in the Pearl River Delta region and in both ‘wet’ and ‘dry’ seasons.
where D is the population density estimate from Chen et al.