Population Ecology SWBAT Apply measuring a population to

Population Ecology

SWBAT: Apply measuring a population to real world situations. SW: discuss with their groups how estimating a population could be used in a real world situation.

Population Ecology Measuring a population Growth Curves Biotic Potential vs. Environmental Resistance Reproductive Strategies Limits

Measuring a population clumped First things first: • Population vs. Community • Ways a population can be measured – Size: helps monitor population declines uniformed – Density: helps identify if species are rare or abundant. – Distribution: helps regulate food supply and set up management guidelines. Randomed – Sex ratio: helps estimate the number of offspring in the next generation – Age structure: Help predict how quickly the population will grow

No look under your desk and draw the gum populations that you see on page in your spiral. Now label the populations clumped, scattered or uniformed.

Measuring a Population con’t Some tools: • Estimating a population p= (N 1 x N 2)/R – – • • • N 1= Size of sample 1 (all marked) N 2 second sample P = population R= recaptured or marked in second sample Population growth = (births + Immigration)(deaths + emigration) Population rate = growth/time Estimating a population p= (N 1 x N 2)/R N 1= Size of sample 1 (all marked) N 2 second sample P = population R= recaptured or marked in second sample Deaths and Emigration = decrease Births and immigration = growth Population growth = (births + Immigration)- (deaths + emigration) 0= equilibrium (no change) Population rate = growth/time

Make this chart on page 17 R (number marked) N 1 (number originally marked) N 2 (number of second sample) P (population estimate) 10 10 10 Average P =

SWBAT: Apply measuring a population to real world situations. SW: discuss with their groups how estimating a population could be used in a real world situation.

How could this be used in a real world setting? What are some ways that this could be made more exact?

SWBAT: Apply measuring a population to real world situations. SW: discuss with their groups how estimating a population could be used in a real world situation.

APES SWBAT: identify different ways of measuring populations. (growth curves, resistance, biotic potential, reproductive strategies and limits) SW: discuss ways to measure populations by working in pairs and participating in a rally coach.

Growth curves Exponential Logistic J-shaped S-shaped

Biotic Potential vs. Resistance • Potential = what things could be under ideal conditions • Resistance= combination of all biotic and abiotic factors that may limit a population’s increase. – Moisture, temperature, salinity (aka limiting factors) Ex: Loss of habitat may cause migration or death

Reproductive Strategies • R-strategists • K strategists

Limits • Density Independent • Density Dependent • Critical number: minimum population base (how low can we go? ) • Threatened vs. Endangered

• https: //www. youtube. com/watch? v=RBOsqm BQBQk

APES SWBAT: identify different ways of measuring populations. (growth curves, resistance, biotic potential, reproductive strategies and limits) SW: discuss ways to measure populations by working in pairs and participating in a rally coach.