test on ecology = friday purple water survey due tomorrow biomes worksheets from poster project due...

• Test on Ecology = Friday

• Purple Water Survey due TOMORROW

• Biomes worksheets from poster project due TODAY!!!

• Biomes “color” worksheet due TOMORROW!

• Graded papers need to be passed back.

• Still being graded:– Food Web mini lab

Population Size• Number of individuals in

a specific habitat of the same species

Ex. In Alaska, the population of dall sheep is estimated to be about 70,000.

Bell Ringer #6• Define the following terms from

section 4.1

Dispersion

Population Growth

Whether a population grow, shrinks or stays the same depends on:

1. Birth rates2. Death Rates3. Immigration – moving into a population

or community.4. Emmigration – moving out of a

population or community.Ex. Migrating caribou, migrating birds

Exponential Model

• If birth rate surpasses death rate a population will continue to increase exponentially.

• Occurs if a population goes unchecked

Logistic Model• Any factor, such as space,

that restrains the growth of a population is a limiting factor.

• All populations are ultimately limited by their environment.

• The logistic model builds an exponential model but takes into account limiting factors.

• The resources in any given habitat can support only a certain quantity of wildlife.

• As seasons change, food, water, or cover may be in short supply.

• Carrying capacity is the number of animals the habitat can support all year long.

Population Regulation

• Density-Independent factors are events that affect the growth of a population, irrelevant of the population size.

• Ex. Drought, freezes, hurricane, floods, forest fires

New Orleans after Hurricane Katrina

Turnagain Arm at Portage

• A density–dependent factor is a limiting factor triggered by increasing population density, for example a food shortage, predation, competition for light, disease, parasitism

• Can be within a species (intraspecific) or between species (interspecific)

Compare and Contrast …

Please accomplish this task with the person next to you… your partner Mrs. Thiede usually sets you up

with

Extra Time…

• You may work on your BIOME

coloring worksheet that is

due tomorrow