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Questions and Answers
What are examples of density-dependent factors?
What are examples of density-dependent factors?
- Disease, competition, and predation (correct)
- Food availability, water access, and shelter
- Migration, genetic mutation, and birth rate
- Climate, soil type, and sunlight
How can density-dependent factors affect population growth?
How can density-dependent factors affect population growth?
- They have no impact on population size
- They always have a negative correlation to population size
- They always have a positive correlation to population size
- They can either have a positive or negative correlation to population size (correct)
What happens to limiting factors with a positive relationship to population size?
What happens to limiting factors with a positive relationship to population size?
- They remain constant regardless of population size
- They have no effect on the population size
- They increase with the size of the population and limit growth (correct)
- They decrease with the size of the population and promote growth
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Study Notes
Density-Dependent Factors
- Density-dependent factors are factors that affect population growth in a way that is dependent on the population's density or size.
- Examples of density-dependent factors include:
- Predation: an increase in population size can lead to an increase in predation rates
- Competition: increased competition for resources such as food and shelter can lead to reduced population growth
- Disease: an increase in population size can lead to an increased spread of disease
- Parasitism: an increase in population size can lead to an increase in parasitism rates
Effect of Density-Dependent Factors on Population Growth
- Density-dependent factors can slow down or even stop population growth as the population size increases.
- This is because density-dependent factors have a greater impact on the population as it grows, leading to increased mortality rates and decreased birth rates.
Limiting Factors with a Positive Relationship to Population Size
- Limiting factors with a positive relationship to population size are those that increase in intensity as the population size increases.
- These factors can ultimately limit the population's growth, as they become strong enough to counteract the reproductive efforts of the population.
- Examples of limiting factors with a positive relationship to population size include predators, parasites, and pathogens.
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