Warm-upWarm-up

What is one fact about your biome you What is one fact about your biome you remember from the research on your remember from the research on your biome?biome?

What if humans suddenly What if humans suddenly went extinct?went extinct?

https://www.youtube.com/watch?https://www.youtube.com/watch?v=7ZPKw9fKhD0v=7ZPKw9fKhD0

Succession intro activitySuccession intro activity

What would happen if the SAHS football What would happen if the SAHS football field was abandoned?field was abandoned?

Draw pictures (using color) to show what Draw pictures (using color) to show what the field might look like in the future…10 the field might look like in the future…10 years…25…50…100 years down the years…25…50…100 years down the road.road.

Ch. 3 Ch. 3 Communities Communities

& Biomes& Biomes

SuccessionSuccession Series of predictable changes Series of predictable changes

that occurs in a community over that occurs in a community over timetime

Primary SuccessionPrimary Succession The 1The 1stst stage stage On land where there are no On land where there are no

living organisms.living organisms. Pioneer SpeciesPioneer Species: 1: 1stst species to species to

populate the areapopulate the area

Secondary SuccessionSecondary Succession

When a disturbance changes When a disturbance changes the existing community, the existing community, things must grow againthings must grow again

Ex. Land is cleared for Ex. Land is cleared for farming, then abandoned, farming, then abandoned, trees begin to grow againtrees begin to grow again

BiomesBiomes

Complex of terrestrial Complex of terrestrial community that covers a community that covers a large arealarge area

Has a certain soil & climateHas a certain soil & climate Has particular plant & Has particular plant &

animalsanimals

Warm-Up

An uncut lawn becomes a meadow and eventually a forest. This process is an example of ___________.

A. Primary SuccessionB. Secondary SuccessionC. Limiting FactorD. Tundra

Biome Presentations

• Respect every group.

• I will deduct points from your entire group if you talk or interrupt other presentations.

• Write one fact from each presentation to turn in.

• Relax (not all of you) and have fun while you are PRESENTING but take notes while you watch.

Ch. 4:

Populations

Characteristics of Characteristics of PopulationsPopulations

Geographic Geographic DistributionDistribution

DensityDensity Growth rateGrowth rate

Factors that Affect Factors that Affect Population GrowthPopulation Growth

# of Births# of Births # of Deaths# of Deaths # of individuals that enter or leave the # of individuals that enter or leave the

population.population.

Exponential GrowthExponential Growth

Individuals Individuals reproduce at a reproduce at a constant rateconstant rate

Unlimited Unlimited growthgrowth

J shaped curveJ shaped curve

Logistic GrowthLogistic Growth As resources become less available, the growth As resources become less available, the growth

of a population slows or stopsof a population slows or stops

Carrying capacityCarrying capacity: The largest number of : The largest number of individuals that an environment can support.individuals that an environment can support.

S shaped curveS shaped curveN

um

ber

of

Yeast

Cell s

Time (hours)

Carrying capacity

represented bycharacterized by characterized by represented by

which cause a

PopulationGrowth

can be

Exponentialgrowth

Logisticgrowth

Fallinggrowth rate

S-shapedcurve

Limits ongrowth

No limits on growth

J-shapedcurve

Constantgrowth rate

Unlimitedresources

Section 5-1

Concept Map

Limiting FactorsLimiting Factors

A factor that A factor that causes population causes population growth to decrease.growth to decrease.

Nutrients, Nutrients, competition, competition, predation, predation, parasitism, water, parasitism, water, humanshumans

Density Dependent Density Dependent FactorsFactors Depend on population sizeDepend on population size Competition, predation, parasitism, Competition, predation, parasitism,

diseasedisease

How do increases and How do increases and decreases in the moose decreases in the moose population affect the wolf population affect the wolf population?population?

60

50

40

30

20

10

1955 1960 1965 1970 1975 1980 1985 1990 1995

2000

1600

1200

800

400

0

2400

Moose Wolves

Density Independent Density Independent FactorsFactors Affect all populations in similar ways Affect all populations in similar ways

(do not depend on size)(do not depend on size) Weather, Seasons, Natural Disasters, Weather, Seasons, Natural Disasters,

Human ActivitiesHuman Activities

Human Population Human Population GrowthGrowth

Until about 500 years ago, the world’s Until about 500 years ago, the world’s human population remained fairly stable. human population remained fairly stable. Then, as advances in medicine, Then, as advances in medicine, agriculture, and technology occurred, the agriculture, and technology occurred, the human population began growing very human population began growing very rapidly. Today, the world’s human rapidly. Today, the world’s human population is greater than 6 billion people, population is greater than 6 billion people, and it continues to grow, but at a slower and it continues to grow, but at a slower rate. rate.

Human Population Human Population GrowthGrowth

Agriculturebegins

Plowingand irrigation

Bubonicplague

IndustrialRevolutionbegins

Age DistributionAge Distribution

U.S. Population Rwandan PopulationMales MalesFemales Females

The human population is increasing by about The human population is increasing by about 1.4% each year. If the population is 6 billion 1.4% each year. If the population is 6 billion (6,000,000,000) this year. How large will the (6,000,000,000) this year. How large will the population be next year?population be next year?

6,000,000,000 X 0.014 = 84,000,000 people, 6,000,000,000 X 0.014 = 84,000,000 people, so the population would be 6,084,000,000 so the population would be 6,084,000,000 people.people.

If the human population continues to grow at a If the human population continues to grow at a rate of 1.4 percent per year, the population rate of 1.4 percent per year, the population would double in size (to 12 billion people) in would double in size (to 12 billion people) in only 51 years! only 51 years!

What effect might this increase in What effect might this increase in population have on the environment population have on the environment

and on other people?and on other people?

What will happen when humans reach their What will happen when humans reach their carrying capacity on Earth?carrying capacity on Earth?

What do you think the carrying capacity of What do you think the carrying capacity of humans on the Earth is?humans on the Earth is?