Get to work…1. Get your notebook.2. Open to pages 60-61.3. Continue working on “What is the

definition of Population Distribution” worksheet. (Textbook page 107)

Reminders …1.Cell phones2.Backpacks, food/drink3.There are zeroes in the

gradebook. Office hours!4.Graphing worksheets5.Summative tomorrow!6.Lost and found: men’s bracelet,

small key7.Fire drill Friday

Today …1. We will take notes on population distribution.2. We will organize the information into an

informational chart.3. We will do hands-on practice of density and

distribution.4. Time permitting, we’ll start notes on age

distribution graphs.

Worksheet …What is the definition of Population Distribution:

This describes how organisms are arranged within their area.

Worksheet …The first type of population distribution is:Random Distribution  Definition: Individual organisms are arranged within a space in ____________________________. Why does this type of distribution happen? It can occur when the _________________ an organism needs are found throughout an area and ___________________ do not strongly influence where members of a population settle.

no particular pattern

resources

other organisms

Random Dispersion

a) In random dispersion, the location of one individual is independent of the location of the other individuals.

b) Random dispersal may result from seed dispersal:

by the wind or animals.c) A forest or a field of wildflowers

results from the random dispersal of seeds.

Worksheet …The second type of population distribution is:Uniform Distribution  Definition: This is when individual organisms are ________________ throughout an area. Why does this type of distribution happen? This can occur when individuals hold _____________ or otherwise ____________ for space.

evenly spaced

territories compete

Uniform Dispersion

a) In a uniform dispersion, individuals are:separated by a fairly even distance.

b) Uniform distributions are usually the result of _____________________, but the interaction results in the individuals trying to:get as far away from each other as possible.

b) Uniform distributions are usually the result of _____________________, but the interaction results in the individuals trying to:get as far away from each other as possible.

social interactions

These penguins exhibit uniformdispersion because of aggressive interactions that occur between neighbors.

Worksheet …The third type of population distribution is:Clumped Distribution  Definition: Individual organisms arrange themselves according to the availability of the ____________ they need to ______________. Why does this type of distribution happen? This is the ________________ pattern in nature. For example, __________________ may live in patches around isolated __________________.

resources survive

most commondesert animals

sources of water

Clumped Dispersion

a) In clumped dispersion the individuals are clustered together.

b) Clumped distributions often occur when:resources such as food, water, or living spaces are clumped together.

c) Clumped distributions may also occur because a species has:a certain social behavior, such as herding animals, flocks of birds, schools of fish or hives of bees.

Types ofPopulationDistribution

Individualsare arranged

around sources

of resources.

Random

Clumped

UniformIndividualsare arranged

in no particular pattern.

Individualsare evenly

spaced in an area.

Highlight

Highlight

Highlight

Notebook …Type Picture Example ReasonRandom

Uniform

X X XX XX X XXX XX X

Clumped

Penguins on their nests.

Gathered around available resources.

Notebook …Type Picture Example ReasonRandom

Uniform

X X XX XX X XXX XX X

Clumped

Penguins on their nests.

Gathered around available resources.

Flower seeds spread out in a field

Herd of elephants. Most common

Stay away from each other so there is no fighting.

There are plenty of resources everywhere.

X X X X X XX X X

XXXXXXX XXX

Models …1. Model a high population density.2. Model the population distribution that is most

commonly found in nature.3. Model the population distribution that

happens when resources are found everywhere.

4. Model the population distribution that happens when organisms keep their own territories because they might fight one another.

5. Model the population density that makes diseases easy to spread.

Models …6. Model the population distribution that

happens when water is found only in certain areas.

7. Model the population density that makes it easy to find a mate.

8. Model the population distribution that happens when a plant’s seeds spread over a field.

9. Model the population distribution that happens when organisms don’t influence each other in any way.

10.Model the population density that results in a lot of competition for resources.

Let’s highlight the vocabulary on their pages …

Vocabulary ListVocabulary Word ISN Page

53

Abiotic 59Biotic 59Community 59Ecosystem 59Habitat 54Individual 59Population 59Species 55Resources 54Population distribution 61Population density 61Sex ratioBiotic PotentialCarrying CapacityLimiting FactorsEmigrationImmigrationExponential GrowthFluctuatingLogistic GrowthMigrationPopulation GrowthRise-and-CrashSurvivorship CurveBiotechnologyEndangered SpeciesEthicsInvasiveNative SpeciesNonnative Species

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Aha Connections

57

Aha Connections

56

How do changes in population size relate to

environmental conditions?

Aha 1: I can differentiate between the levels of ecological organization (pages 58 and 59).

Aha 2: I can describe the resources, biotic and abiotic factors, that organisms require to survive in a habitat (page 54).

Aha 3: I can explain how changes in population size can indicate the health of a population (page 61).

Aha 4: I can differentiate between the different population distributions and give examples of each (page 61).

Aha 5: I can describe how population density is influenced by the availability of local resources (page 61).