Predator: Increase in predator population will decrease prey population.
Prey: Increase in prey population will support more predators.
Competitor: Competition will intensify for resources.
Parasite: More parasites will weaken host populations.
Host: If hosts increase, parasites will have more resources.
Mutualistic partner: Both species will benefit and thrive.
Commensal: One species benefits while the other remains unaffected.