population ecology tabitha walton and heath edwards
TRANSCRIPT
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POPULATION ECOLOGYTabitha Walton and Heath Edwards
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STUDIES THE DYNAMICS OF A SPECIES’ POPULATION AND HOW THESE POPULATIONS INTERACT WITH THEIR ENVIRONMENT
Population Ecology
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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
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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
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SURVIVORSHIPType I Type II Type III
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
Have great number of offspring and reproduce for most of their lifetime.
Ex: Sea turtles, fish, and oysters
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SURVIVORSHIP
Type I Type II Type III
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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.
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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