Your students will enjoy each of these videos that discuss something about ecosystems. Each video is followed by a short quiz to check the students' understanding of the information. You could use these videos as part of a class station or as the home portion of a flipped classroom.
Learn about new ways to teach about ecosystems with this document that includes original ideas for food web instruction and a new way to teach about systems in general. While it's focused on high school, the concepts are applicable to other grades.
Understanding how human development and other activities impact the balance in our ecosystems is important in order to improve our teaching of the systems. This article and the related resources will help you do just that.
In this informative article, the author explains why it is important to teach about ecosystems and how our understanding of them needs to change due to changes in our environments. He also examines different sources for standards on ecosystems.
As a teacher, I would start at this site. It provides a good definition of ecosystems along with some history of the term. You will also find definitions of related terms, an explanation of the importance of studying ecosystems, and other resources.