AP BIOLOGY

Detailed explanation-1: -Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size. With a positive relationship, these limiting factors increase with the size of the population and limit growth as population size increases.

Detailed explanation-2: -Competition and predation are two important examples of density-dependent factors.

Detailed explanation-3: -Predation, diseases and competition in an ecosystem are among the factors that affect the population when the population density reaches a specific level. These factors are called density-dependent factors. For instance, when the population density is high, the spread of disease is likely also to be high.

Detailed explanation-4: -Competition is a density-dependent limiting factor. The more individuals living in an area, the sooner they use up the available resources. Fewer resources means greater competition for those resources. Competition can be within one’s own species.

Detailed explanation-5: -In density dependent disease transmission contact rates increase as density increases, therefore disease transmission also increases. Frequency dependent disease transmission occurs when there is no relationship between contact rates (or transmission events) and density of a population.