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Population ecology

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

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  1. Population ecology Tabitha Walton and Heath Edwards

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

  3. 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

  4. 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

  5. survivorship 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

  6. survivorship Type I Type II Type III

  7. questions • 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.

  8. 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

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