Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 52 - 52.3 - Concept Check - Page 1176: 2


The general adaptations to a saltwater environment differ greatly from adaptations to a freshwater environment. Animals living in estuaries must be able to osmoregulate quickly and effectively under multiple wildly different conditions.

Work Step by Step

Saltwater is hypertonic to blood and freshwater is hypotonic. Most aquatic animals are adapted to osmoregulate under only one of these circumstances and could not effectively do so if their environment were to flip from one to the other. Animals living in estuaries must have the ability to do this (and do this quickly!) to survive there.
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