In this lesson, students learn about different types of ecological relationships, including symbiosis, mutualism, commensalism, and parasitism. Includes handouts and a vocabulary list with definitions.

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...

Test your skills with this nine-question unit test.

In this comprehensive lesson unit, students examine how overfishing has affected Chesapeake Bay's ecosystem. They will study food webs from the past and present and graph related data.

Explains what a predator-prey relationship is and describes ten examples of this.

Explains what mutualism, commensalism, and parasitism are.

Learn about the anatomy and ecological relationships of the horseshoe crab.

Like a time machine, amber fossils take us back in the earth's history to discover the plants, animals and ecological relationships of prehistoric ecosystems. This resource has several interesting pictures of a variety of Dominican...

Question and answer site that contains a discussion of commensalism as it pertains to sea slugs. Nice photographs of aquatic commensalistic relationships.

Interspecific competition in an ecosystem is explained, along with the different ways it can manifest itself. Includes examples in different types of biomes.

Explains what parasitism is and provides a few examples of parasitic relationships.

Describes the characteristics of a tundra biome, how a tundra food chain compares to a tropical food chain, and what the different trophic levels look like.

Explains the roles of consumers, producers, and detrivores or decomposers and how energy flows through the different levels of the energy pyramid of a tropical rainforest.

Explains what a food web is, the complexity of one in a rainforest, and how energy flows through a food web.

Explains what intraspecific competition is and gives examples.

Explains what autotrophs and heterotrophs are, the several types of each, their roles in an ecosystem's food chains, and the differences between them.

Anje-Margriet Neutel describes some common positive and negative feedback loops, examining how an ecosystem's many loops come together to make its 'trademark sound.' [5:11]

This entry identifies the defining characteristics of the various diets of animals, including those that are herbivores, carnivores and omnivores.

Tillena Lou and her siblings spend a lazy day imagining what it might be like if they were other types of animals. What would they need to survive? Synopsis: Tillena Lou explores her home and discovers interesting things about the...