Final answer:
Reducing the amount of grassland to 70% of the space will decrease the carrying capacity for buffalo in this ecosystem.
Step-by-step explanation:
Reducing the amount of grassland to 70% of the space will decrease the carrying capacity for buffalo in this ecosystem. Carrying capacity refers to the maximum number of individuals of a species that an environment can support without causing damage or depletion of resources. With less space for growing grass, there will be a decrease in the availability of food for the buffalo, leading to a decrease in their population size that the ecosystem can sustain.