UNIT 4 EVOLUTION AND CHANGEexpanded to change the
color displayed by each
cell. And each of those
cells is controlled
separately. The
cephalopod's complex
brain coordinates all
this.
Imagine how many
subtle differences in
color can be created in
this way. The octopus
or squid is capable of
producing millions of
patterns to match any background. And, amazingly, the
cephalopod does all this instantaneously.
Survival strategies
Cephalopods still must use a variety of other strategies to
adapt to their environments. For example, an octopus or
squid can change its texture using muscles in the skin. They
also use different body postures to sculpt themselves into
their surroundings. So they may curl into a ball and change
their skin texture and look like a rock - to predator or prey.
Cephalopods change their appearance in courtship, in acts of
aggression, and to warn of danger. Squid will display a high-
contrast zebra pattern when courting in order to discourage
other males from mating with a certain female.
These chameleons of the sea have survived over eons
because they adapted to their surroundings. Like every
animal, their survival depends on escaping predators,
finding food, and reproducing. Think of it: The cephalopod’s
complex ability to sometimes render itself nearly invisible
has meant the species has not disappeared from the ocean.
Questions:- How do cephalopods differ from other mollusks?
- What is “background resemblance”?
- Why is it important for cephalopods to blend in?
- What are chromatophores?