Explain the difference between density-dependent and density independent factors that affect populations.?

Question

organic biology

population density (organic biology)

Answer 1

Density independent regulation assumes that factors other than density limit growth. For example: a short growing season or disasters.

Density dependent regulation is when limited resources lower survival or limit growth.

Evidence for density dependent regulation is a decline in per capita growth or reproduction with increasing density.

Answer 2

Density Independent Factors

Answer 3

Density dependent factors are population limiting factors that increase in intensity as the population increases in size. These include limited food supplies, increased risk for infectious disease, and an increase in toxic waste levels. They cause either declines in the birth rates or increases the death rate. An example of this would be the Bubonic Plaque that hit overcrowded European cities in the fourteenth century.
Density Independent factors influence population growth rates. Examples include severe droughts that increase the death rate in plant life, or increase temperatures that increase the birth rates of insects. An example of this could be the Tussock month. In La Porte, a small city in CA where my family camps the pines trees were being eaten by the caterpillar of the tussock month. They were literally falling from the trees last summer. They are poisonous and many of us got rashes from the caterpillars. Typically this is not a problem because the snow fall fills most of the eggs of the caterpillars; however the winter wasn’t cold enough to do this so there was an increase in the birth rates of the caterpillars and as a result the pine trees were being overeaten and killed.

Answer 4

uhh do you mean physical density or population density?