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 biotic factors. The presenter defines and explains how biotic factors, which are living factors that affect a community, can impact the members and distribution of organisms in ecosystems. The...

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...

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,...

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! ...

Discover the vital role of sea turtles in marine ecosystems, where they act as keystone species influencing their environment profoundly. This video shows how their dietary habits benefit other marine life and ocean health,...

This video provides a basic understanding of the different levels of organization in nature, starting from individual organisms to populations, communities, and ecosystems.



This video is part of the 9-part series, Ecology...

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...

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...

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...

Science Kids Cloning Endangered Species - Pros and Cons

The video discusses the potential of cloning technology in preserving endangered species and restoring ecosystems. By introducing genetic diversity through cloning, scientists...

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...

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...

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...

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,...

This segment delves into how pathogens, particularly the Deformed Wing Virus transmitted by Varroa mites, detrimentally affect honey bee health and their critical role in ecosystems. It illustrates the compounded risks bees face from...

Paul Andersen explains how biology is ordered in the hierarchy of life. He first of all describes how emergent properties appear as you move to more inclusive systems. The then describes life at the following levels; atom, molecule,...

Paul Andersen explains how biology is ordered in the hierarchy of life. He first of all describes how emergent properties appear as you move to more inclusive systems. The then describes life at the following levels; atom, molecule,...

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...

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 measuring populations. The presenter explains how to investigate the distribution of daisies in a field and how it varies with distance from a line of trees. The hypothesis is formulated based on...