Download Aquatic Ecosystems School to Home LESSON 2 1.

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School to Home
Aquatic Ecosystems
Directions: Use your textbook to answer each question.
1. Salinity is the measure of the amount of salt in water. Organisms are
adapted to the level of salinity in the waters in which they live.
Would organisms that live in a lake be adapted to life in a coastal wetland? Explain
your answer.
2. Streams and rivers have different levels of nutrients and dissolved oxygen.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Why do fast-moving streams have less nutrients and more oxygen than slow-moving
3. An estuary forms where freshwater streams or rivers flow into a body of
salt water, such as an ocean.
How does the filling or polluting of estuaries affect fish and bird species?
4. The open ocean is a saltwater aquatic ecosystem with several zones.
What are the ocean’s three main zones, and what are the major characteristics of each one?
Biomes and Ecosystems