Happy Tuesday!! Feb. 7th

Think back…what’s a population? Draw one on your page.

QUIZ today—study quietly until the bell!

Chapter 19: Chapter 19: PopulationsPopulations

19-1: 19-1: Understanding Understanding

PopulationsPopulations

How big is the HUMAN pop?

6.3 BILLION in 2003

Tripled since 1900!!

World Population Clock

What’s a population?

Same species Live in same place @ same time

Examples?

Studying Populations

Pop size: # indiv in pop

Not always easy to measure! Mobile vs immobile Many vs few

Subsample, extrapolate

Population Density

How crowded # indiv/unit area or volume

Depends on Dispersion!

Spatial distribution

UNIFORM CLUMPED RANDOMDraw:

Why?

Ex?

Review http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/

60336.htm

How about these?

Demography Birth rate (natality)

US: ~4 million/yr Death rate (mortality)

US: ~2.6 million/yr Life expectancy

US: 74-80 yrs

Which country has a higher % of young people?

Of elderly people? Which may show rapid growth in

the near future?

Patterns of Mortality: Survivorship Curves

I:

II:

III:http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/60340.htm

p. 384

Happy Monday! 9/19

Give an example of an animal for each type of Survivorship Curve.

Chapter 19: Chapter 19: PopulationsPopulations

19-2: 19-2:

Measuring Measuring PopulationsPopulations

Pop Growth Rate

Amount the pop size changes over time

Depends on 4 processes:

Birth

Death

Immigration

Emigration

Increasing or decreasing?

Growth rate is positive

Growth rate is negative

Two Pop Growth Models Exponential Logistic

Draw

B, D?

Limiting factors?

Carrying capacity?

http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/60341.htm

http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/60343.htm

Models to Predict

As pop grows, what happens to density?

More competition, limited resources

Pop. Size: Limiting Factors Density-Independent Density-

DependentPop dens matter?

Ex?

Fluctuations are Natural

Small Pops Have Problems

Endangered species Siberian tiger, California condor,

cheetah, sea turtles, panda Natural disasters, disease;

inbreeding Bigger impact

Concept Map online

http://my.hrw.com/sh2/sh07_10/student/flash/concept_maps/00174.htm

p. 389

Chapter 19: Chapter 19: PopulationsPopulations

19-3: 19-3:

Human Human Population Population

GrowthGrowth

Fast? Slow? Leveled off?

Bubonic Plague, 1340s/50s Improved health conditions 1650s Further improved after WWII in poorer

countries Type of growth curve?

Sustainable?

p. 392

Happy Tuesday! 9/20/2011

Test Tomorrow…3-2-1! List:

THREE things you’re confident about TWO things you’re unsure about ONE thing that you want to know but

we didn’t discuss!

Chapter 19 Review, p. 394