This unit introduces students to disturbances to the ecosystem. Some disturbances are natural; others are caused by human actions. Disturbances can harm an ecosystem; however there are times when an ecosystem benefits from a disturbance. Following a disturbance, there is usually a recovery. These recoveries can occur with or without human intervention.

Students specifically learn about disturbances in the Chesapeake Bay and their impact on the food web. Students see how human intervention in some problems can cause unintended consequences. They consider the multiple perspectives of stakeholders as they make a decision as to whether or not to intervene in a problem. Students argue the perspective of a particular stakeholder and consider the strengths of the arguments of others.

(Teacher notes are available here.)