ISBN:

• 9781432938680
• 9781432938611

Description: 48 pages : color illustrations,color map ; 25 cm.

Notes: Includes bibliographical references and index.

LCCN: 2009049552

Control Number: 798600

Series:

• Protecting food chains
• Protecting food chains.

Subjects:

• Food chains (Ecology) -- Juvenile literature.
• Stream ecology -- Juvenile literature.