Chapter 37 - Communities and ecosystems. This chapter presents the following content: A community includes all the organisms inhabiting a particular area, Interspecific interactions are fundamental to community structure,competition may occur when a shared resource is limited,. | Chapter 37 Communities and Ecosystems PowerPoint Lectures for Biology: Concepts & Connections, Sixth Edition Campbell, Reece, Taylor, Simon, and Dickey Lecture by Brian R. Shmaefsky Copyright © 2009 Pearson Education, Inc. Introduction: Hungry Hippos All communities and ecosystems have certain features in common Each type of ecosystem has its own unique structure and dynamics Human activities can disrupt the balance of ecosystems Copyright © 2009 Pearson Education, .