Ecosystems

Ecosystem for kids - This lesson explains and explores the dynamics in an ecosystem.

A lesson about the environment, biomes and ecosystems, and how all life depend on each other in different ways.

The lesson explains how ecosystems interact with biotic and abiotic factors. Learn about food chains and food webs with help of examples. The lesson presents real data from Yellowstone Park to show how populations interact. It also explains how human impacts can eventually lead to changes within an ecosystem.

Lesson on ecosystem that explains the importance of biodiversity. It explains how biodiversity can be species, genetic or ecosystem diversity. It explains the importance of keystone species in an environment with help of two examples - the jaguar and the sea otter.

Learn about biotic and abiotic factors, and differences between them. The lesson explains how both abiotic and biotic factors can affect organisms at the level of the cell, the population and even the ecosystem.

The lesson explains how populations interact in an ecosystem. It covers interactions such as mutualism, commensalism and parasitism; and symbiosis of multiple populations. The effects may be neutral, positive, or negative. Human impacts to ecosystems are also considered.

A presentation on ecosystem ecology, which looks at how energy, nutrients, and materials are getting shuffled around within an ecosystem. Learn about ecosystems, trophic structure, primary producers, primary, secondary and tertiary consumers, detrivores, bioaccumulation and more.

A lesson on terrestrial biomes - deserts, grasslands, and forests. It explains factors such as latitude, proximity to oceans, and elevation, that affect climate. It discusses climate's relationship to the type of vegetation found in major terrestrial biomes including tropical and temperate rainforests, deciduous forests, savannas, grasslands, chaparrals, taiga, tundra and deserts.

A lesson on freshwater aquatic biomes - lakes, rivers, and wetlands. Learn about the characteristics common to all aquatic environments. It examines the different zones of freshwater lakes, the seasonal cycling of oxygen and nutrients.

A lesson on wetlands - the ecologically rich biomes. It explains the ecological importance of wetlands as they are considered the most biologically diverse of all ecosystems, serving as home to a wide range of plant and animal life.

Learn about rainforests and discover what rainforests need to survive, and how these beautiful and vital natural resources are quickly disappearing. Uses stunning imagery, the video teaches us all about the wonders of the rainforest.

A presentation on deciduous forest biomes.

A video about the tropical grasslands.

The video illustrates the beauty and wonder of two of the world's biomes - taiga and tundra.

Lesson on ecosystem populations. It looks the distribution of populations over space and time, and the factors that influence such distributions.

Lesson on ecosystem populations. It looks at how population growth rates are calculated and introduces the concepts of biotic potential, exponential growth and environmental resistance before looking at boom-and-bust cycles and the carrying capacity of ecosystems.

Lesson on ecosystem populations. It examines predator-prey relationships and the various adaptations such as camouflage, warning coloration, mimicry and chemical warfare that have evolved. Symbiotic relationships such as parasitism, commensalism, and mutualism are also explored.

Explore the types of close and often long-term interaction between different biological species.

Learn about mutualism, commensalism, and parasitism - the different ways living things interact with one another.

Amazing examples of animals and other creatures interacting in beneficial relationships.

Learn about coral reef ecosystems. Coral reefs form some of the most diverse ecosystems on Earth. They occupy only 0.1% of Earth's surface but provide a home for 25% of all marine species!

Explore life in the polar regions, and the dynamics of the polar ecosystems.

Learn about salt desert shrub ecosystems that contribute to the diversity of Wyoming's rangelands.

The presentation describes how ponds function including the importance of aquatic plants and algae to fish and other pond life.

The video takes you on a 400 million year journey to illustrate the diversity and beauty of life in the forests. It features the birds and primates of the forest canopy, and insects of the forest floor. It helps you better understand and appreciate the treasures of this environment.

Learn about the environmental dangers facing the world's shallow waters. With high demands for rare species of fish, coral reefs are in danger of being fished out and deserted.

Learn about the largest living structure, the Great Barrier Reef. It spans more than 1,200 miles (2,000 km) of islands and submerged reefs.

Explore the Amazon forest and see how a cute otter family is saved. Watch a relaxed young family of South American otters saved from being hunted for their fur.

The video looks at how plants compete to get the most sunlight in thick tropical forest.

Explore with a deep sea geoscientist as he studies life at depths down to 3,000 meters under the sea. In these exotic surroundings, the scientist has discovered both new animal species and communities, and new geological truths.

Learn more about life around hydrothermal vents - one of the strangest ecosystems on Earth that lie deep under the ocean.

A presentation on temperate deciduous forest.