The largest density an ecosystem can support for a particular population is called growth rate boom-bust cycle birth rate carrying capacity

Carrying capacity of an environment or habitat to support life or living organisms in the area in a maximum population of species without consuming all the environmental resources that are in the area.

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.