Week 3 (Tier 1/2)

Population Growth and Carrying capacity

Week 3

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Share your observations about this photo:

Carrying Capacity

A population usually grows when it has plenty of food and other resources. When a population runs out of resources, members will die. Carrying Capacity is the maximum humber of indivuduals that can survive and produce healthy offspring in an ecosystem.

Density- independent

Limiting Factors

A limiting factor is something living or nonliving that controls the population growth of an organism. Biologist have identified two major types:

Density-dependent

Humans can impact the carying capacity of local deer population by...... (decreasing land/resources.....managing hunting tags.....)

Q.13 As our human population continues to grow, identify AND explain at least one possible way that humans could impact the carrying capacity of a local deer population. Your example may be positive or negative.

Assignment 3.2 Rabbit Population by Season Gizmo

carrying capacity graph

An "overshoot" in popultion growth is when the population size exceeds the carrying capacity.

Rabbit Population

Not all limiting factors are related to a population’s density. Density-independent limiting factors affect a population regardless of its size and density.

Density-Independent limiting factors- rabbit population

Density-dependent limiting factors: rabbit population

Not all limiting factors are related to a population’s density. Density-independent limiting factors affect a population regardless of its size and density.

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Factors that promote competition that limit population growth

Density Dependent Factors

• predation
• disease
• competition
• light
• water/nutrients
• space

How many penguins can live in this ecosystem?

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Under Ideal conditions, populations of most species can grow at exponential rates. The red curve in the figure below represents exponential growth. The population starts out growing slowly. As population size increases, the growth rate also increases. The larger the population becomes, the fast it grows.

Exponential Growth

Q.2 Answer

• Weather
• Human activities
• Pesticides and Herbicide
• Habitat Destruction

Density independent factors

Density independent factors also limit populations but rarely regulate populations because they act irregularly regardless of the populations density.

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According to the video, carrying capacity can be defined as the maximum number of individuals that can survive in a given area.

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Most populations do not live under ideal conditions. Therefore, most do not grow exponentially. Certainly, no population can keep growing exponentially for very long. Many factors may limit growth. Often, the factors are density dependent (known as density-dependent factors). These are factors that are influential when the population becomes too large and crowded.

Logistic Growth

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• Consectetur adipiscing elit.
• Sed do eiusmod tempor incididunt ut.
• Labore et dolore magna aliqua.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.