In this video Paul Andersen explains how ecosystems function. He begins with a description of how life on the planet is ordered from large to small in biomes, ecosystems, communities, population, and individuals. He describes the major...

Hank wraps up the Crash Course on ecology by taking a look at the growing fields of conservation biology and restoration ecology, which use all the kung fu moves we've learned about in the past eleven weeks and apply them to protecting...

This video is a lecture presentation on biotic factors. The presenter defines biotic factors and explains how they can affect communities and ecosystems. The focus is on living factors, such as availability of food, arrival of new...

What is the difference between a population, community and ecosystem and species? What defines different populations of the same species? What factors lead to separate populations? In this program explains that members of the same...

Dr. Forrester defines the term ecosystem and talks about the factors that have a negative effect on them. Dr. Forrester will also discuss measures that can be taken to help preserve our ecosystems.

This video is a lecture presentation on populations. The presenter defines the terms population, community, and ecosystem and explains how these terms are related. The factors affecting the size of a population, such as food supply,...

This video is a lecture presentation on conservation and the importance of using our environment and its resources sustainably. The speaker discusses sustainable resources such as forests and fish stocks, and the need to manage them...

Paul Andersen explains how populations interact in an ecosystem. The symbiosis of several populations is based on effects that may be neutral, positive, or negative. Interactions like mutualism, commensalism and parasitism are...

Paul Andersen explains how ecosystems interact with biotic and abiotic factors. He explains and gives examples of food chains and food webs. He shows how limiting factors eventually leads to logistic growth. Real data from Yellowstone...

In this video Paul Andersen explains the important relationships that exist in ecosystems. He starts by delineating between organisms and their environment. He explains how food webs can be used to show energy and matter flow in a...

Paul Andersen differentiates between biotic and abiotic factors. He explains how both abiotic and biotic factors can affect organisms at the level of the cell, the population and even the ecosystem. The complexities of biofilms,...

When most people think of fishing, we imagine relaxing in a boat and patiently reeling in the day's catch. But modern industrial fishing -- the kind that stocks our grocery shelves -- looks more like warfare. Ayana Elizabeth Johnson and...

Population ecology is the study of groups within a species that interact mostly with each other, and it examines how they live together in one geographic area to understand why these populations are different in one time and place than...

Today we’re going to talk about the link between population and food energy. As the world's population keeps growing, finding ways to provide enough food and water for everyone while supporting a sustainable environment can be tricky! ...

In this video Paul Andersen defines biodiversity and explains the impacts humans are having on the planet's biodiversity. Humans are impacting the variety of life on our planet through habitat destruction, invasive species, pollution,...

Predator-prey relationships are essential in the safari ecosystem, affecting survival and population health. Lions demonstrate teamwork in hunting, while prey like zebras adapt through vigilance and group movement. Various hunting...

The video discusses the concept of a community in an ecosystem and the levels of organization within it. It covers the role of photosynthetic organisms in producing biomass, the different types of consumers (primary, secondary, and...

This final segment of the Integrated Pest Management (IPM) series showcases how IPM effectively addresses not just pest control and pesticide reduction but also crucial challenges like the Deformed Wing Virus and nutritional deficits...

The video is a lecture presentation on communities and the relationships between organisms in an ecosystem. The narrator uses the example of a community of organisms in a wooded area and discusses the feeding relationships between them....

The video is a lecture presentation on communities and the relationships between organisms within them. It uses an example of a community that includes an owl, a snake, a shrew, a frog, a beetle, grasshopper, and grass living in a wooded...

In this video, we will learn about the pressing issue of water scarcity, exploring its root causes such as climate change, population growth, and mismanagement of water resources. We'll dive into the impacts that water shortages have on...

Parasites give most of us the heebie-jeebies. But new research shows they're pretty dang important for ecosystems, and climate change is putting them in danger. So here's some of the reasons you should care about those guys!

The video is about the different components of an ecosystem, specifically the biotic components, which include all living things in an area. The video provides examples of different populations and communities, such as monarch and tiger...

This is a lecture presentation on feeding relationships in ecosystems. The presenter discusses the interdependence of different organisms in a community and the consequences of a change in that community. Using a specific community as an...