Summary #7 "How Ecosystems Change"

What happens when people abandon a city? Natures takes over; one example is the cities and the temples of Angkor in Camboidia (they were built between 820 and about 1150. Lest me explain you; the gradual replacement of one monnunityby another is called Ecological Succesion. The ecological succesion takes places in five steps:

1. Abandoned Farm---First Year: A comunity of crabgrass, insects, and mice invades the fields where corn or another crop once grew.
2. Second and Third Years: Tall weeds, such as asters, ragweed, and goldenrod, and tall grasses grow among the crabgrass. The crabgrass can´t easily survive in the shade cast by the taller weeds. It begins to die out. Rabbits and seed-eating birds move in.
3. Four to six Years: The comunity is growing it have stunks, birds and others mammals like the mouse.
4. Twenty five years later: Pines agrew up there are much kinds of mammals like the fox, racoons,birds etc.
5. One hundred years later: know the forest is an decidious forest with deers,more trees etc.