Which of the following scenarios best describes a density -dependent factor limiting population growth?
A)An April blizzard kills off many migrating barn swallows,which could not tolerate the cold and snow.
B)A particularly dry summer shrinks and dries up many ponds in central Canada,causing increased aggression and competition for limited nest sites among female common goldeneyes (ducks).
C)A tropical storm strikes one of the Hawaiian Islands and wipes out a population of nénés that had been recovering from near -extinction.
D)A particularly snowy winter makes it difficult for female deer to find food,thus affecting their ability to reproduce.
E)A homeowner sprays her lawn with broadleaf herbicide to kill the dandelions that have started growing there that spring.

Question

Quizplus · Accepted Answer

A dry summer causing limited availability of resources (ponds) leads to increased competition and aggression among the population of ducks, which is a density-dependent factor limiting population growth. The other options, which involve blizzards, storms, individual snow or herbicide, are not density-dependent factors.

Which of the Following Scenarios Best Describes a Density -Dependent