First slide

Populations

Question

In a field experiment, when Pisaster was removed from an enclosed intertidal area of the American Pacific Coast,

Easy

A

some species of vertebrates became extinct
B

the species diversity of invertebrates increased
C

some species of invertebrates became extinct
D

the species diversity of vertebrates decreased

Solution

In the rocky intertidal communities of the American Pacific Coast the starfish Pisaster is an important predator. In a field experiment, when all the starfish were removed from an enclosed intertidal area, more than 10 species of invertebrates became extinct within a year, because of interspecific competition.

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