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Some Animals Are More Equal Than Others: Keystone Species And Trophic Cascades

19 minutes 27 seconds

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Large fish with a spotted upper body and white underbelly swimming open-mouthed into a school of smaller fish. Caption: Each community is populated by different species.

What determines how many species live in a given place? Or how many individuals of the species can live somewhere? The research that provided answers to these questions was set in motion by the key experiments of ecologists Robert Paine and James Estes. Their research demonstrates just how fundamental keystone species and trophic cascades are in understanding ecology.

Media Details

Runtime: 19 minutes 27 seconds

Topic: Science
Subtopic: Biology, Ecology, Science Experiments, Science Methods
Grade/Interest Level: 9 - 12
Standards:

Release Year: 2016
Producer/Distributor: Howard Hughes Medical Institute
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Lab equipment in background with illustration of DNA strand, question marks, and an arrow pointing to the horn on a unicorn. Caption: We'd want to know what parts of the genome make the horn.

Lab equipment in background with illustration of connected neurons. Caption: glia activate and help fix the neurons

Still image from: 4 Awesome Discoveries You Probably Didn't Hear About This Week (Episode 36)

A caterpillar curled in a circle, mostly encased in a protective covering. Caption: Then the caterpillar goes to sleep.

Green foliage with a pink flower overlooks the shoreline. Spanish captions.

Closeup of a bright orange and blue tropical flower. Spanish captions.

A seal swimming underwater near the ocean floor. Caption: still remain to satisfy diurnal scavengers

A warthog with long tusks curving towards its body and leathery skin covered in mud. Caption: we can see that each has a beauty all its own.

Person driving a large piece of industrial farm equipment. Caption: towards managing agricultural systems

Large tent with open sides covering people seated and standing around tables holding gear and other items. Two people carefully placing bones in the outline of a body. Caption: for what early bipeds looked like.