5.1 Population Density & Dispursement

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Learning Target:

Learning Target What is a population ? What are three characteristics of types of a population ? Take notes using the worksheet

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Population How populations grow

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group of organisms of the same species that live in the same location. Yosemite Brown Bears Galapagos Blue Footed Booby Artic Narwhals Populations

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3 Characteristics of Populations Population density II. Population dispersion III. Growth Rate

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Recall that a population is a group of the ______ species living in the________ area. Same Same

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Q#1: Population Density For example, if there are 50 horses living in an area of 10 km², the population density would be 5 horses per km². Population density is a measure of the number of individuals living in a defined area. The formula for calculating population density is: # of individuals / area (units²) = population density

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Population Density Which is more dense? Rubber Duck Rubber Duck

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Population Density Which is more dense? Aspen Trees Saguaro Cactus

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What is the population density of Bears in this photo?

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What is the population density of horses in this photo? 5

Population Dispersion :

Population Dispersion Population dispersion is how individuals of a population are spread out in a specific area. There are 3 types of population dispersion patterns: Most common Clumped dispersion: animals living in groups or packs, to help with hunting and feeding, as well as protection from predators. Uniform dispersion: Animals are territorial and compete for resources by living at specific distances from one another. Random dispersion shows no distinct pattern within a specific area. Which is most common?

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clumped Clumped, Uniform, or Random?

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random Clumped, Uniform, or Random?

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clumped Clumped, Uniform, or Random?

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uniform Clumped, Uniform, or Random?

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random Clumped, Uniform, or Random?

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uniform Clumped, Uniform, or Random?

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Populations grow in predictable patterns.

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Exponential growth is a rapid population increase due to an abundance (lots of) of resources.

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Occures when there is unchecked growth due to unlimited resources As a population gets larger it grows faster Birth Rate is greater than Death Rate Exponential growth Aka: the“J-Curve”

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Logistic growth is due to a population facing limited resources.

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Carrying Capacity Number of organisms the environment can support Carrying capacity limited by resources Birth Rate is equal to Death Rate at carrying capacity Logistic growth Aka: the“S-Curve”

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Think about it… Is the human population growing exponentially or logistically ? Take 2 minutes and discuss with your neighbors. Be ready to defend your answer!

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is the maximum number of individuals in a population that the environment can support. This is due to limited resources (food, shelter, space) Carrying capacity

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Limiting factors can depend on the density of individuals in the population or not. A limiting factor is something that keeps the size of a population down.

Two Types of Limiting Factors:

Two Types of Limiting Factors Density-dependent factors Disease Competition Predators Parasites Food Density-independent factors Volcanoes Temperature Storms Floods Drought Habitat disruption

Limiting Factors:

Limiting Factors Which limiting factors are represented by the images above? What are examples of additional limiting factors?

Other population factors:

Other population factors Predation Competition

On a separate sheet of paper, answer the following::

On a separate sheet of paper, answer the following: What is a population ? What are two types of limiting factors to a population? compare and contrast logistic and exponential growth. Which depends on carrying c apacity?

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A population crash is a dramatic decline in the size of a population over a short period of time.

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