In this tutorial, students will study populations learning about how interactions can affect size. Tutorial explores competition, predation, and symbiosis.

Create the parameters of your own ecosystem by choosing which producers and consumers live there. Visualize how the food web operates and species populations change. This simulator mimics the food web within a typical ecosystem and gives...

This comprehensive study guide covers the main terms and concepts needed for a unit on community ecology.

Dive in and explore what makes this beautiful world so fragile. In this Web feature, from the PBS series "Evolution," discover how coevolution has shaped the ecological relationships among reef creatures.

College-level online course highlighting the fundamentals of ecology. Course topics include coevolution of the biosphere, geosphere, atmosphere, and hydrosphere; photosynthesis and respiration; and the carbon, nitrogen, and water cycles....

This activity helps students understand how predator-prey interactions affect population sizes and how competitive interactions affect population sizes. They will also explore the major factors that influence the predator-prey relationship.

[Free Registration/Login may be required to access all resource tools.] Covers interactions between organisms.

Explains what a symbiotic relationship is, the five main types of symbiosis, and provides examples of symbiotic relationships among living things in a deciduous forest.

Describes conditions in a desert that limit how large populations of species can grow.

Species interact every day. That interaction is a vital part of how organisms develop and change over time. When you study species, it is important to watch the way they interact with their surroundings. There are four basic types of...