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 rates 2.Death Rates 3.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)

Density- Independent Density- Dependent 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