What is the struggle for food, space and other limited resources called?

Competition.

The struggle for food, space, and other limited resources is called competition. In the natural world, organisms must compete with one another for resources in order to survive and reproduce. This process is known as competition.

If you are searching for information about competition between organisms, I suggest looking up articles or books about ecological or evolutionary biology. These sources will provide a deeper understanding of the concept and the various strategies organisms employ to compete for limited resources.