INFLOWS:
SPLIT ¼ IF PRIME_GRND_POP > 7 THEN INT(PRIME_GRND_POP/
3*SPLIT_PROB) ELSE 0 {Individuals per Year}
BIRTH_DEATH_MG ¼ INT(KM*MAR__GRND_POP) {Individuals per Year}
OUTFLOWS:
DUMP_MGP ¼ IF MAR__GRND_POP < 3 THEN INT(MAR__GRND_POP)
ELSE 0 {Individuals per Year}
PRIME_GRND_POP(t) ¼ PRIME_GRND_POP(t À dt) + (BIRTH_DEATH_PGP
À SPLIT À DUMP_PGP) * dt
INIT PRIME_GRND_POP ¼ 100 {Individuals}
INFLOWS:
BIRTH_DEATH_PGP ¼ IF PRIME_GRND_POP >¼ 7 THEN INT
(KP*PRIME_GRND_POP) ELSE 0 {Individuals per Year}
OUTFLOWS:
SPLIT ¼ IF PRIME_GRND_POP > 7 THEN INT(PRIME_GRND_POP/
3*SPLIT_PROB) ELSE 0 {Individuals per Year}
DUMP_PGP ¼ IF PRIME_GRND_POP < 3 THEN INT(PRIME_GRND_POP)
ELSE 0 {Individuals per Year}
KM ¼ GRAPH(YEAR)
(0.00, 0.05), (1.00, À0.05), (2.00, À0.05), (3.00, À0.15), (4.00, À0.15), (5.00,
À0.05), (6.00, À0.05), (7.00, 0.05), (8.00, 0.05), (9.00, 0.15), (10.0, 0.15),
(11.0, 0.05), (12.0, 0.05).
KP ¼ GRAPH(YEAR)
(0.00, 0.12), (1.00, 0.02), (2.00, 0.02), (3.00, À0.08), (4.00, À0.08), (5.00, 0.02),
(6.00, 0.02), (7.00, 0.12), (8.00, 0.12), (9.00, 0.22), (10.0, 0.22), (11.0, 0.12),
(12.0, 0.12).
SPLIT_PROB ¼ INT(2*RANDOM(0,1))
TOTAL_HERD_POP ¼ PRIME_GRND_POP+MAR__GRND_POP {Individuals}
YEAR ¼ INT((time MOD 12)) + 1
Reference
1. Starfield AM, Bleloch AL (1986) Building models for conservation and wildlife. MacMillan,
New York (Chapter 2)
Reference
195