Download - Happy Tuesday!! Feb. 7 th
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