Ch. 20.1 Population Ecology pp.379-382 Population = group of the same species, in the same place, at the same time the place can be defined any way you decide Pop. size = count Pop. density = thickness = 𝑝𝑜𝑝. 𝑠𝑖𝑧𝑒 𝑎𝑟𝑒𝑎 Population #1: 30 people in the gym Population #2: 20 people in Mr. G’s room Which has a higher size? Which has a higher density?

Ch. 20.1 Population Ecology pp.379-382 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pop. Size #1 = 30 Pop. Density #1 𝑝𝑜𝑝. 𝑠𝑖𝑧𝑒 𝑎𝑟𝑒𝑎 = Pop. Size #2 = 20 Pop. Density #2= 𝑝𝑜𝑝. 𝑠𝑖𝑧𝑒 𝑎𝑟𝑒𝑎 = ←80 ft→ ←100 ft→ ←30 ft→ ………. ←20 ft→

Ch. 20.1 Population Ecology pp.379-382 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pop. Size #1 = 30 Pop. Density #1 = 𝑝𝑜𝑝. 𝑠𝑖𝑧𝑒 𝑎𝑟𝑒𝑎 = 30 𝑝𝑒𝑒𝑝𝑠 100 𝑓𝑡 𝑥 80 𝑓𝑡 = 30 𝑝𝑒𝑒𝑝𝑠 8000 𝑓𝑡2 = 0.003 Pop. Size #2 = 20 Pop. Density #2= 𝑝𝑜𝑝. 𝑠𝑖𝑧𝑒 𝑎𝑟𝑒𝑎 = 20 𝑝𝑒𝑒𝑝𝑠 30 𝑓𝑡 𝑥 20 𝑓𝑡 = 20 𝑝𝑒𝑒𝑝𝑠 600 𝑓𝑡2 = .03 ←80 ft→ ←100 ft→ ←30 ft→ ………. ←20 ft→

Ch. 20.1 Population Ecology pp.379-382 Dispersion = spatial distribution of the population How they are spread out Clumped Even Random Name a population that might be: Clumped: Even: Random: :: ::: . . . . . . . . . . : . : . . : .

Ch. 20.1 Population Ecology pp.379-382 Dispersion = spatial distribution of the population How they are spread out Clumped Even Random Name a population that might be: Clumped: ducks on a pond Humans in a city Even: Owls in a forest Random: Beetles in a forest :: ::: . . . . . . . . . . : . : . . : .

Ch. 20.1 Population Ecology pp.379-382 Population Dynamics = how populations change Dynamic = changing constantly Birth rate = births/time Death rate = deaths/time Life expectancy = how long the average individual is expected to live Why might the average woman live longer? Is it because they are healthier or the average man lives shorter?

Ch. 20.1 Population Ecology pp.379-382 Age structure = distribution by age of individuals in a population

Ch. 20.1 Population Ecology pp.379-382 Survivorship curve = shows when populations die (how they survivor) Type I: few die early in life, many die late in life (humans, elephants) Type II: die equally throughout life (prey species, mice, squirrels, rabbits…) Type III: many die early, few die late (insects, oysters, turtles)

Ch. 20.1 Population Ecology pp.379-382 OUT: Table 20-1 p. 380 Predict the Land Size of the countries from Largest to smallest. Calculate the population of the U.S. in the year 2000 using the information from the table, if the U.S. has an area of 9,620,000 km2