How can the introduction of a new pathogen affect the population of a species within a community?

The introduction of a new pathogen can lead to a decline in the population of the affected species as individuals may become ill or die from the disease. This can disrupt the balance of the community, potentially leading to increased competition for resources among remaining species and affecting predator-prey relationships.

This answer is strong because it clearly explains the direct impact of a pathogen on a species' population and the subsequent effects on the community. The question tests the student's understanding of biotic factors and their influence on community dynamics.