Today’s Lab:

Last practicalLast practicalRevised syllabusRevised syllabusNo lab next weekNo lab next weekSpecies interaction lab: 9:30 am, Saturday July 18thSpecies interaction lab: 9:30 am, Saturday July 18th

Due July 18th: Wiki & pre-labDue July 18th: Wiki & pre-lab

Population Ecology worksheet - due by Monday

Species interaction lab

http://natl.ifas.ufl.edu/http://maps.google.com/maps?f=d&source=s_d&saddr=University+of+Fla&daddr=29.633289,-82.367206&hl=en&geocode=FahVxAEdfoMX-w%3B&mra=dme&mrcr=0&mrsp=1&sz=16&rtol=0&dirflg=w&sll=29.635341,-82.362742&sspn=0.008374,0.017016&ie=UTF8&ll=29.638716,-82.357635&spn=0.016748,0.034032&t=h&z=15

How to edit

• How to edit– http://en.wikipedia.org/wiki/How_to_edit– http://en.wikipedia.org/wiki/Wikipedia:Tutorial

• Create an ACCOUNT– http://en.wikipedia.org/w/index.php?title=Special:UserLogin&type=signup

• Play in the SANDBOX– http://en.wikipedia.org/wiki/Wikipedia_talk:Sandbox

• How to upload pictures– http://en.wikipedia.org/wiki/Wikipedia:Uploading_images– Need to make 10 edits and be active for 4 days to upload pictures– Picture upload wizard (once you are autoconfirmed)– http://en.wikipedia.org/wiki/Wikipedia:Images_for_upload/Wizard/Autoconfirmed

Human Population Clock

•

http://www.census.gov/ipc/www/popclockworld.html

Exponential Growth CurveExponential Growth Curve

Growth rate = dN/dt = rmaxNExponential Growth CurveExponential Growth Curve

Reproductive Capacity of the Reproductive Capacity of the Housefly (Housefly (Musca domesticaMusca domestica))

Generation Number

1 1202 7,200

3 432,000

4 25,920,000

5 1,555,200,000

6 93,312,000,000

7 5,598,720,000,000

Logistic Growth CurveLogistic Growth Curve

⎟⎠

⎞⎜⎝

⎛ −=

K

NKNrG max

G = growth ratermax= intrinsic rate

of increaseN = population sizeK = carrying capacity

Lag

Exponential

Equilibrium

Examples of Density-dependent FactorsExamples of Density-dependent Factors

Examples of Density-dependent FactorsExamples of Density-dependent Factors

• Intra-specific • competition

Within species competition for

limited resources

• Predators• Pathogens

Population cycles in snowshoe hare and lynxPopulation cycles in snowshoe hare and lynx

St. Matthew Island reindeerSt. Matthew Island reindeer

Source:

D.R. Klein (1968)

http://dieoff.org/page80.htm

Human population growth is an Human population growth is an

exponential growth phaseexponential growth phase

WHY?

Total births

Total elderly

Immigration

Emigration

Total population

N = (births + immigrants) - (deaths + emigrants)

http://www.worldmapper.org/textindex/text_index.html

Human appropriation of photosynthesis

http://www.earthday.net/footprint/index.html

The average American’s energy use is equal to the consumption of •2 Japanese

•6 Mexicans

•13 Chinese

32 Indians140 Bangladeshis284 Tanzanians372 Ethiopians

By 2015 nearly half of the world's population - more than three billion people - will be in countries lacking sufficient water

Pleistocene extinction

Gomphothere

Late Pleistocene Extinctions – 13,000 years ago, N & S America

Sixth extinction

E.O. Wilson estimated that the planet is losing 30,000 species per year -- 100 to 1000 times the background rate of species extinctions

Bali tiger - 1937

Golden Toad was last seen on May 15, 1989.

Human action has transformed between one-third and one-half of the entire land surface of the earth.

We have lost more than one-quarter of the planet's birds, and two-thirds of the

major marine fisheries are fully exploited, over-exploited or depleted.

What is the carrying capacity of Earth?

What do you think life on earth (including humans) on earth will look like

• in 50 years? • In 500 years?• In 5000 years?• In 50,000 years?

Demography - age-specific Demography - age-specific population parameterspopulation parameters

A.A. Population SizePopulation Size

B.B. FertilityFertility

C.C. MortalityMortality

D.D. Age structureAge structure

Age structures of three nationsAge structures of three nations

Easter Island

• Settled 700-800 AD• Overpopulation in 800-1600ad • 1722 – 1st Europeans• 1860’s slave raids, smallpox

introduced,• Tuberculosis, wars• 1774 Captn Cook – statues toppling

– All down by 1830’s

Human Population Clock – http://www.census.gov/ipc/www/popclockworld.html

–

How many people were added to the world population during THIS lecture?

Computer simulations - Computer simulations - Biology Labs OnlineBiology Labs Online

To study aspects of human population To study aspects of human population demography and population ecology of demography and population ecology of sparrows.sparrows.

There are two parts to the worksheet (pg 123-128)There are two parts to the worksheet (pg 123-128)Population DemographyPopulation Demography

Population EcologyPopulation Ecology

Due Saturday July 18thDue Saturday July 18th

Wiki project - turn in list of participants in the group, and any Wiki project - turn in list of participants in the group, and any additional information about how the page was edited that is not additional information about how the page was edited that is not evident from reviewing the article (before & after) and reading the evident from reviewing the article (before & after) and reading the discussion page. You will receive a grade as a group.discussion page. You will receive a grade as a group.

Species interaction pre-lab (pgs 153-155) Species interaction pre-lab (pgs 153-155)