14.4 Competition with Immigrants.

A predator immigrant tile is treated exactly as a carnivore animal, using the DNA and dentition code shown on its tile.

1. Size. Immigrant predators are automatically the same size as their prey.

2. Immigrant Dentition. The dentition code of immigrant predators is only one-tooth.

Example: Three carnivores are competing to eat an herbivore in a habitat. The 1-tooth immigrant and 3-teeth carnivores have no P DNA, and the 5-tooth carnivore has one P DNA. The 5-tooth carnivore wins the physiology contest, so the others starve.

15.0 Greenhouse28

A red disk in the chart on the west map edge monitors the Earth's Greenhouse Level. The higher the level, the hotter the climate. The Greenhouse can end the game, see 18.0c.

15.1 Greenhouse Habitat Displacement.

During global warming, the greenhouse level disk goes up one step, and the habitats displace north to stay cool. During global cooling, the disk goes down and the habitats move south to stay warm.

1. Habitat Displacement. If the greenhouse rises, move every habitat (including its biome, and all its animals and immigrants) north to the slot directly above. (Its best to start with the most northerly biomes.) If the greenhouse falls, move every habitat south to the slot directly below. If it cannot move because it is at the map’s edge, it remains where it is.

Exceptions: Orogeny biomes (2.4e) and super-ferns (6.1f) do not displace during greenhouse events. The habitat directly north or south will displace into its slot, and then the lower-climax biome goes extinct.

Note: Farms (9.2e) displace with their homeland.

2. Biome Competition. If after the habitats are displaced, two biomes are stacked together, the lower climax biome goes to the tarpit. The animals on the extinct biome also are lost, unless they can live in the winning biome.

3. Melting of the Ice-Caps.²⁹ If the Greenhouse moves into the 3200-ppm spot, each biome marked with a blue star is flipped after it is displaced, now representing a barren sea biome. If the greenhouse drops from 3200 ppm, flip each back to its face-up side.

4. Ice-Cap Formation. If the Greenhouse moves into the 200 ppm spot, each biome marked with a white star is flipped after it is displaced, now representing an ice habitat (11.1d). If the greenhouse rises from 200 ppm, flip each back to its face-up side.

5. Inverted Biomes. A biome inverted by a high or low Greenhouse is uninhabitable (and, in the case of low Greenhouse, impassible to flightless animals as well). It is considered to have a climax of 100 plus its original climax. For instance, climax 63 goes to 163.

Example: The Greenhouse falls. The orogeny biome doesn’t displace. Biome A also doesn’t displace, since it is at the edge of the map. Biome B moves south on top of Biome A. Since Biome A has the smaller climax, it goes extinct. Note if the Atlantic Ocean has formed, Biome B would be blocked from displacing, and nothing would change.