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Bullfrog Films

610-779-8226; 800-543-3764; P.O. Box 149 Oley, PA 19547
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Bullfrog Films

is a leading source of educational DVDs & videos, with a collection of over 700 titles in these main subject areas:

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The Variety of Life

Preserving the balance of dynamic ecosystems.

A printer-friendly version of this page 43 minutes
Directed by Dal Neitzel
Produced by The Greater Ecosystem Alliance
Written by Mitch Friedman

Biodiversity is a new term with profound ramifications: all things are connected in a web of life. Any action taken in an ecosystem affects all the components of that ecosystem.

Conventional wildlife management failed to protect species and habitats in wilderness areas. A new approach to conservation biology is based on the interconnectivity of ecosystems.

The video workshop BIODIVERSITY: THE VARIETY OF LIFE, through the use of maps, diagrams and examples, introduces several new terms and concepts, including fragmentation, linkage, and viable population, which offer important insight into preserving the balance of dynamic ecosystems. While focusing on the North Cascades ecosystem, it presents concepts which apply everywhere.

Grade Level: 10-12, College, Adult
US Release Date: 1992     Copyright Date: 1991
DVD ISBN: 1-59458-366-8     VHS ISBN: 1-56029-436-1

"Packed with information...a valuable teaching program for students of biology, ecology, and environmental science."
New York Biology Teachers Association

"Scenic and informative."

"Illuminating, synergistic approach to a multitude of environmental issues."
Video Librarian

"Finally, a clear and understandable explanation of these complex but crucial concepts."
Brock Adams, National Audubon Society

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"Illuminating, synergistic approach." Video Librarian

Links (The producer's web site)
Study guide

Conservation Biology
Forests and Rainforests

Related Titles

Natural Connections
Makes a compelling scientific and ethical case for maintaining biodiversity.

The Salmon Forest
Reveals the fragile connection between salmon, bears, trees, and people in the NW rainforest.


Replaces the human-centered concept of environment with ecosystems.

Home Place
Putting the role of human beings in the biosphere back into proper perspective.

The controversy surrounding the decline of the prairie dog.

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