A drought causes grasses to decline, which reduces the number of grasshoppers. In turn, this reduces the number of shrews
In a freshwater stream, bass prey on snail darters. The darters hide in rocky shelters, where crayfish prey on them. As a result, the darter population declines.
Bald eagle populations decline as a result of bioaccumulation of DDT in their bodies. As a result, the rat population of the region increases.
Humans have decreased their reliance on natural resources.
Humans have developed physical characteristics that increase their competitive advantage.
Humans have increased the amount of resources available on Earth.
Humans have increased the carrying capacity of the biosphere for the population.
A limiting factor
Humans need clean water to drink
Humans need food to eat
Future generations should get to enjoy the biosphere
The ecosystem cycles nutrients that humans need
The ecosystem provides raw materials for human use
Brain worms and deer
Cave-dwelling bats and big brown bats
Corals and algae
Wolves and moose
Colony collapse disorder
Empty space on which to build homes
Habitat for thousands of species
Reduction of erosion in watersheds
Regulation of weather patterns
When an organism comes to a new habitat that has a lot of resources
When an animal is predated upon
When pressures on a population are removed