4.1 Number of types and undirected variation of humans and plants (\(n_{H}\) x \(n_{P}\) x \(v_{H}\) x \(v_{P}\))
| parameter | value |
|---|---|
| initial_population_humans | 10 |
| initial_population_plants | 10 |
| number_types_humans | 5 - 45 (sample = 5 ) |
| number_types_plants | 5 - 45 (sample = 5 ) |
| undirected_variation_humans | 0.05 - 0.25 (sample = 5 ) |
| undirected_variation_plants | 0.05 - 0.25 (sample = 5 ) |
| intrinsic_growth_rate_humans | 0.04 |
| intrinsic_growth_rate_plants | 0.1 |
| utility_per_capita_type_n_plants_to_humans | 1.5 |
| utility_per_capita_type_n_humans_to_plants | 1 |
| utility_per_capita_type_1_plants_to_humans | 0.15 |
| utility_per_capita_type_1_humans_to_plants | 0 |
| utility_other_to_type_n_humans | 10 |
| utility_other_to_type_n_plants | 20 |
| utility_other_to_type_1_humans | 80 |
| utility_other_to_type_1_plants | 100 |
| max_area | 200 |
| max_iterations | 5000 |
| reltol_exponential | 6 |
| coevolution_threshold | 0.5 |
| humans | 85.1414283817248 - 303.920561546526 (sample = 625 ) |
| plants | 93.5982997036815 - 200 (sample = 372 ) |
| coevolution_coefficient_humans | -0.893138319410505 - 0.796970470817761 (sample = 625 ) |
| coevolution_coefficient_plants | -0.918044258212089 - 0.784003454561172 (sample = 625 ) |
| dependency_coefficient_humans | -0.632605349151667 - 0.897316999088837 (sample = 625 ) |
| dependency_coefficient_plants | -0.943727131580906 - 0.820755925015822 (sample = 625 ) |
| timing_humans | 0 - 1117 (sample = 131 ) |
| timing_plants | 0 - 1074 (sample = 84 ) |
| time_end | 427 - 3284 (sample = 240 ) |
| adaptativeCost.H | 0 |
| adaptativeCost.P | 0 |
Interpretation:
- Higher values of all four parameters facilitate coevolution. Undirected variation has a stronger effect than number of types.
- As a summary of possible end-states:
+ ‘Fast’ coevolution (red square in blue tile, small t): most cases when the numbers of types (\(n_{H}\), \(n_{P}\)) are greater than 15 and values of undirected variation (\(v_{H}\), \(v_{P}\)) higher than 0.15.
+ ‘Semi-domestication’ without cultivation (redish square in whitish tile): cases when \(v_{P}\geq 0.15\) and \(v_{H}\leq 0.15\).
+ ‘Semi-cultivation’ without domestication (whitish square in blue tile): cases when \(v_{H}\geq 0.15\) and \(v_{P}\leq 0.15\).