1. Education
You can opt-out at any time. Please refer to our privacy policy for contact information.

Heterotroph

By

Atlantic puffin feeding on fish
Comstock/ Stockbyte/ Getty Images
Definition: A heterotroph is an organism that is unable to obtain its carbon from carbon dioxide. Instead, heterotrophs obtain carbon by feeding on the organic material present in other organisms, living or dead.

All animals are heterotrophs. Blue whales feed on crustaceans. Lions eat mammals such as wildebeest, zebras and antelope. Atlantic puffins eat fish such as sandeel and herring. Green sea turtles eat seagrasses and algae. Many species of corals are nourished by zooxanthellae, tiny algae that live within the corals' tissues. In all of these cases, the animal's carbon comes from ingesting other organisms.

In contrast, an autotroph is an organism that obtains its carbon from carbon dioxide. Autotrophs need not feed on other organisms, since they can synthesize the carbon compounds they need for energy using sunlight and carbon dioxide.

  1. About.com
  2. Education
  3. Animals / Wildlife
  4. More Animal Facts »
  5. Zoology Basics
  6. Zoology Glossary
  7. H
  8. Heterotroph - Definition

©2014 About.com. All rights reserved.