Post on 31-Dec-2015
description
Ch. 20.1 Population Ecologypp.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
=
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 Ecologypp.379-382
Pop. Size #1 = 30Pop. Density #1
Pop. Size #2 = 20Pop. Density #2=
. . . . . .. . . . .. . . . .. . . . .. . . . .. . . .
……….……….
←100 ft→
←30 ft→←
20 ft
→
←80
ft→
Ch. 20.1 Population Ecologypp.379-382
Pop. Size #1 = 30Pop. Density #1 =
= = 0.003
Pop. Size #2 = 20Pop. Density #2= = = .03
. . . . . .. . . . .. . . . .. . . . .. . . . .. . . .
……….……….
←100 ft→
←30 ft→←
20 ft
→
←80
ft→
Ch. 20.1 Population Ecologypp.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 Ecologypp.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 Ecologypp.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 Ecologypp.379-382
Age structure = distribution by age of individuals in a population
Ch. 20.1 Population Ecologypp.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 Ecologypp.379-382
OUT: Table 20-1 p. 380
1. Predict the Land Size of the countries from Largest to smallest.
2. 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