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Questions and Answers
What formula do we use to calculate population density?
What formula do we use to calculate population density?
Total number of individuals/unit area
Some characteristics that all populations have include?
Some characteristics that all populations have include?
Population density, growth rate, dispersion
How do populations tend to be dispersed?
How do populations tend to be dispersed?
Randomly, uniformly, and in clumps
Populations also tend to stabilize near the?
Populations also tend to stabilize near the?
Factors that limit populations are either?
Factors that limit populations are either?
Earthquake-related tsunami is considered density independent?
Earthquake-related tsunami is considered density independent?
Intense competition for a food source is density dependent?
Intense competition for a food source is density dependent?
Influenza epidemic is a density independent factor?
Influenza epidemic is a density independent factor?
Flooding due to a hurricane is a density independent factor?
Flooding due to a hurricane is a density independent factor?
What do population-limiting factors do?
What do population-limiting factors do?
Density-independent factors include parasites and disease?
Density-independent factors include parasites and disease?
On Isle Royale, the population of moose decreased as the population of wolves decreased?
On Isle Royale, the population of moose decreased as the population of wolves decreased?
Competition can occur within a species or between two different species?
Competition can occur within a species or between two different species?
What type of growth is demonstrated by exponential growth?
What type of growth is demonstrated by exponential growth?
What type of growth does logistic growth refer to?
What type of growth does logistic growth refer to?
A mouse is an example of an?
A mouse is an example of an?
A spider is an example of an?
A spider is an example of an?
A human is an example of an?
A human is an example of an?
An elephant is an example of an?
An elephant is an example of an?
Population sampling proportion example?
Population sampling proportion example?
Why are the units in a population density calculation squared and not cubed?
Why are the units in a population density calculation squared and not cubed?
Area of a rectangular object?
Area of a rectangular object?
Main idea of this section is?
Main idea of this section is?
What are the characteristics of populations and how they are distributed?
What are the characteristics of populations and how they are distributed?
What are the differences between density-independent and density-dependent limiting factors?
What are the differences between density-independent and density-dependent limiting factors?
How does carrying capacity affect reproductive rates?
How does carrying capacity affect reproductive rates?
Population density?
Population density?
Dispersion?
Dispersion?
What is a species' range?
What is a species' range?
Why might a species not be able to expand its population range?
Why might a species not be able to expand its population range?
Limiting factors?
Limiting factors?
Limiting factors are either?
Limiting factors are either?
Density-independent factor?
Density-independent factor?
Density-independent factors are?
Density-independent factors are?
Examples of density independent factors include?
Examples of density independent factors include?
Density-dependent factor?
Density-dependent factor?
Density-dependent factors are?
Density-dependent factors are?
Examples of density dependent factors include?
Examples of density dependent factors include?
Population growth rate (PGR)?
Population growth rate (PGR)?
Natality?
Natality?
Emigration?
Emigration?
Immigration?
Immigration?
Exponential growth model?
Exponential growth model?
Logistic growth model?
Logistic growth model?
Carrying capacity?
Carrying capacity?
Species vary in the number of births per?
Species vary in the number of births per?
Plants and animals are placed into groups based on their?
Plants and animals are placed into groups based on their?
R-strategy?
R-strategy?
K-strategy?
K-strategy?
Study Notes
Population Density and Dynamics
- Population density is defined as the total number of individuals per unit area.
- Populations possess characteristics such as density, growth rate, and dispersion patterns.
- Dispersion can occur in three main forms: randomly, uniformly, and in clumps.
Carrying Capacity and Growth Factors
- Populations stabilize near the carrying capacity of their environment, which is the maximum number of individuals that can be supported.
- Limiting factors that restrict population growth are categorized as density-dependent or density-independent.
- Density-dependent factors, such as intense food competition, epidemics, and changes in predator numbers, rely on the population size.
- Density-independent factors, like natural disasters and environmental changes (e.g., tsunamis, hurricanes), are not influenced by population density.
Types of Population Growth
- Exponential growth occurs when growth rate is proportional to population size before encountering limiting factors.
- Logistic growth follows exponential growth and occurs when population growth slows or stops due to factors like a higher death rate than birth rate or emigration exceeding immigration.
Population Strategies
- Species exhibit different reproductive strategies: r-strategists (e.g., mice, spiders) produce many offspring with little investment in their care, while K-strategists (e.g., humans, elephants) have fewer offspring and invest more energy in nurturing them.
Population Characteristics and Dynamics
- Population growth rate (PGR) quantifies how fast a population grows and is influenced by natality (birthrate), immigration, and emigration.
- The area of a population can be calculated using length x width, relevant in determining density measures.
- Species' range refers to their distribution in an environment, which can be limited by abiotic conditions impacting survival.
Limiting Factors and Their Role
- Limiting factors can be biotic (living factors), like disease and competition, or abiotic (non-living factors), such as weather, pollution, and habitat alterations.
- Factors influencing population dynamics play a crucial role in maintaining ecological balance and preventing indefinite population increases.
Key Definitions
- Natality: Birthrate of a population within a specific timeframe.
- Emigration: The act of individuals moving away from a population.
- Immigration: The act of individuals moving into a population.
- Carrying capacity: The threshold population size an environment can sustain.
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Description
This quiz covers key concepts from Chapter 4, Section 1 on population dynamics. It includes definitions and formulas related to population density, characteristics of populations, and dispersion patterns. Test your understanding of how populations interact with their environments.
