Population ecology
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Population ecology. Tabitha Walton and Heath Edwards. Population Ecology. Studies the dynamics of a species’ population and how these populations interact with their environment. Terms and vocabulary. Density : The number of individuals in a given area

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Population ecology

Population ecology

Tabitha Walton and Heath Edwards

Population ecology

Population Ecology

Studies the dynamics of a species’ population and how these populations interact with their environment

Terms and vocabulary
Terms and vocabulary

  • Density: The number of individuals in a given area

  • Sex Ratio: The number of males to females

  • Density Dependent: Survival of the population depends on the number of species

  • Density Independent: No relation to population; Ex: natural disasters and disease

  • Limiting Resources: What limits a population; Ex: amount of food/water/predators

  • Carrying Capacity: The number of organisms an area can support

  • Overshoot: When a population becomes larger than the carrying capacity

  • Die-off: Results after an overshoot, because there are not enough resources to support the population

Population ecology

K- Selected

R- Selected

High survival rates, but die out with older age, mature slowly, tend to be both predator and prey, mostly endangered, tend to be larger.

Ex: Humans, elephants, and sharks.

Have a lot of offspring, but very few make it to adulthood, mature rapidly, tend to be prey, not really endangered, tend to be smaller

Ex: Insects, bacteria, and rodents


Type I

Type II

Type III

Have great number of offspring and reproduce for most of their lifetime.

Ex: Sea turtles, fish, and oysters

Reproduction occurs pretty early in life, low mortality rate at birth, high rate of surviving to adulthood, death rates increase at old age.

Ex: Humans, elephants, and sheep

Death rate is pretty uniform throughout all variety of ages, typically reach adult stages quickly.

Ex: Rodents and songbirds


Type I

Type II

Type III


  • 1.) What environmental factors affects carrying capacity?

  • 2.) R-Selected species tend to have more offspring, how does this affect their survival rate?

  • 3.) That factors have extended the survival rate of humans?

  • 4.) What occurs to a J-shaped curved graph when it reaches an overshoot?

  • 5.) Explain the relationship between limiting resources and a carrying capacity.

Population ecology video and sites
Population ecology video and sites

  • http://www.youtube.com/watch?v=RBOsqmBQBQk

  • http://home.comcast.net/~sharov/PopEcol/lec1/whatis.html

  • http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookpopecol.html

  • http://www.eoearth.org/article/Population_ecology