Populations chapter 5 in text

3 factors affecting population size Births Deaths Immigration and Emigration

Growth without limiting factors

Growth without limiting factors Under ideal conditions a population will show exponential growth What are ideal conditions?

Limiting factors can be density-dependent or density-independent Density-dependent factors are limiting factors that depend on population size Examples of density-dependent factors: Examples of density-independent factors:

Density-dependent or Density-independent?

Density-dependent or Density-independent?

Density-dependent or Density-independent?

Growth with limiting factors Under such circumstances a population show an s-shaped curve, indicating logistic growth

What is “K”?

What is “K”? “K” stands for a concept called carrying capacity, which is the largest number of individuals with in a species that the environment can support.

What is shape of global human growth?

What is shape of global human growth?

What is shape of global human growth?

r-selected vs. K-selected species

Characteristics of r- and K-selected organisms r-organisms K-organisms short-lived long-lived small large weak strong or well-protected waste a lot of enrgey energy efficient less intelligent more intelligent have large litters have small litters reproduce at an early age reproduce at a late age fast maturation slow maturation little care for offspring much care for offspring strong sex drive weak sex drive small size at birth large size at birth

What are your demographics? Demographics: the statistical data of a population, especially those showing average age, income, education, etc.

Age-structure diagrams predict future population size, looking at age, gender Match the countries: US, Germany, Kenya, Italy

Age-structure diagrams predict future population size Match the countries: US, Germany, Kenya, Italy