Why are biotic factors called density dependent factors in population regulation?

What is density-dependent regulation?

density-dependent: Processes that occur when population growth rates are regulated by the size of a population in a given amount of resources such as food or habitat area.

Are biotic factors density-dependent?

Other density-independent factors include hurricanes, pollutants, and seasonal climate extremes. Density-dependent limiting factors tend to be biotic—having to do with living organisms. Competition and predation are two important examples of density-dependent factors.

How are density-dependent and density independent factors different?

Density-dependent factors have varying impacts according to population size. … Density-independent factors are not influenced by a species population size. All species populations in the same ecosystem will be similarly affected, regardless of population size. Factors include: weather, climate and natural disasters.

Why is competition a density-dependent factor?

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. … Either way, competition can lower birthrates, increase death rates, or both.

Why is density dependence important in multicellular organisms?

Density-dependent processes are responsible for influencing parasite fecundity, survival, and establishment in macroparasite life cycles. These restriction processes restrict the population growth rates at high parasite populations and control the stability of these populations.

What is the difference between density dependent and density independent limiting factors quizlet?

Density-dependent are affected by number of individuals in a given area (ex. food, disease, predation, competition); Density-independent are factors in the environment that limit the growth of a population (ex. unusual weather, natural disasters, human activities).

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