Which reflects positive density-dependent population regulation?
I. Small populations of flowers produce fewer seeds per individual than large populations of flowers.
II. Large groups of birds are better able to detect and avoid predators than small groups of birds.
III. The probability that a forest predator will kill a squirrel does not depend on the size of the squirrel population.

Question

Quizplus · Accepted Answer

Positive density-dependent population regulation occurs when the rate of population growth increases as the population density increases. Choice I reflects this as it suggests that individuals in larger populations are more successful at reproducing (producing more seeds). Choice II also reflects positive density-dependent regulation because it indicates that larger groups have an advantage (better predator detection), which could lead to higher survival rates and potentially higher population growth rates. Choice III does not reflect density-dependent regulation because the interaction (predator success) does not change with population density.

Which Reflects Positive Density-Dependent Population Regulation