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


Population How populations grow


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


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


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


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


Population Density Which is more dense? Rubber Duck Rubber Duck


Population Density Which is more dense? Aspen Trees Saguaro Cactus


What is the population density of Bears in this photo?


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?


clumped Clumped, Uniform, or Random?


random Clumped, Uniform, or Random?


clumped Clumped, Uniform, or Random?


uniform Clumped, Uniform, or Random?


random Clumped, Uniform, or Random?


uniform Clumped, Uniform, or Random?


Populations grow in predictable patterns.


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


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”


Logistic growth is due to a population facing limited resources.


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”


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!


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


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?


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

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