Based on studies by Jane Lubchenco, what influence does the population density of the herbivorous intertidal snail, Littorina littorea, have on the number of algal species?
A) As snail density increases from low to medium, the number of algal species increases.
B) As snail density increases from medium to high, the number of algal species increases.
C) As snail density increases from low to medium, the number of algal species decreases.
D) As snail density increases from medium to high, the number of algal species decreases.
E) Both as snail density increases from low to medium, the number of algal species increases and as snail density increases from medium to high, the number of algal species decreases.

Question

Quizplus · Accepted Answer

Jane Lubchenco's studies on the intertidal snail, Littorina littorea, demonstrate a classic example of intermediate disturbance hypothesis. At low to medium densities, the snails increase algal species diversity by preferentially consuming fast-growing algae, which allows slower-growing species to flourish. However, at high densities, the snails overgraze, leading to a decrease in algal species diversity. This shows how varying levels of herbivory can first increase and then decrease biodiversity, supporting both parts of choice E.

Based on Studies by Jane Lubchenco, What Influence Does the Population