Parameters and model design for previously created army ant models:
Movement matrix for Deneubourg et al., 1989: Movement Matrix, Solé et al., 2000:
Description

Parameter 
Value 
Notes


Deneubourg et al., 1989 
Sole* 

Quantity
of pher. laid per step 
P 
Out: 1 Returning: 10 
47 

Pheromone
concentration at point (i,j) 
f
(i,j) 
varies 


Concentration
of pheromone with ˝ prob. of movement 
P _{˝} 
100 
100 

Pheromone
Evap. rate 
e  d 
1/30 
2.1 x 10 ^{3} 

Attractiveness
of empty nodes 
m 
5 
47 

Cutoff
for dropping pheromone – going out 
P_{satin} 
1000 
51 

Cutoff
for dropping pheromone – going in 
P_{satin} 
300 
390 
Pher. drop parameters were chosen from previous
work on other ant species (Den. et al. 1989, “Selforganizing
exploratory pattern of the Argentine Ant”). 
Probability
of movement 
p_{
L, O, R} 
see Equations
section 


Max
num of ants / patch 
A_{m} 
20 
30 

Length
of model run (timesteps) 

300, 600, 900 
1000 

Number
of ants leaving nest per timestep 

10 
10 
Ants
don’t leave if next point is full 
Grid
shape / # of nodes to move to 

diamond / 2 
square / 3 










*
Values for Sole et al are the optimized values for E. burchellilike
food distribution. 
Equations




_{} 

Parameter 
Value 
Description 
P_{m} 
_{} 
Probability
of movement 
p_{L} 
_{} 
Probability
of choosing node A (Northwest node) 
p_{R} 
_{} 
Probability
of choosing node C (Northeast node) 
p_{O} 
1
 p_{L}  p_{R} 
Probability
of choosing node B (North node) 
C 
_{} 






