Respuesta :
Answer: It is when the population growth rates are regulated by density of a population. This is important in a multicellular organism for several reasons. It would affect the birth and death rates of the organism.
Explanation:
Density dependence refers to the dependence of population growth on density. Natality and mortality rates depend on the number of individuals. The concept is closely related to competition between individuals for resources.
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The concept is related to the logistic growth model.
Populations that express a logistic growth model are mostly composed of multicellular organisms.
Population growth depends on density. Natality and mortality depend on the population size, meaning that there is no independence between population growth and population density.
When a population grows in a limited space, density rises gradually and eventually affects the multiplication rate.
The population per capita growth rate decreases as population size increases.
While growing, the population reaches a maximum point delimited by available resources, such as food or space. This point is known as the carrying capacity, K.
K is a constant that equals population size at the equilibrium point, in which the natality and the mortality rate get equal to each other.
Assuming that population size is N, when
- N<K, the population can still grow.
- N approximates to K, the population´s growth speed decreases.
- N=K the population reaches equilibrium,
- N>K, the population must decrease in size because there are not enough resources to maintain that size.
Usually a sigmoid curve represents the logistic growth model.
So what does it mean?
That the natality and moratality rate depends on the number of individuals in the population.
As the population grow, the number of individuals increases, and competition for resources increases.
When the population reaches the critical point of being equal to carrying capacity, means that the environment can not support more individuals.
There are not enough resources for all of them, and competition increases affecting the reproductive rate and population growth.
So after this point, the population size decreases.
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