How Populations Change in Size

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What is emigration?

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Emigration is the process of organisms leaving a population and moving away to another location.

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What is immigration?

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Immigration is the process of organisms moving into a population from another location.

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What is birth rate?

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Birth rate is the number of live births per 1,000 individuals in a population per year.

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What is death rate?

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Death rate is the number of deaths per 1,000 individuals in a population per year.

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What are density-independent factors?

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Density-independent factors are environmental factors that affect population size regardless of the population's density, such as natural disasters.

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What are density-dependent factors?

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Density-dependent factors are factors that affect population size in relation to the population's density, such as competition for resources.

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What is carrying capacity?

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Carrying capacity is the maximum number of individuals of a species that an environment can sustainably support.

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What is exponential growth?

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Exponential growth is a rapid increase in population size when resources are unlimited, often represented by a J-shaped curve.

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What is logistic growth?

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Logistic growth is a population growth model that shows how a population grows rapidly at first and then levels off as it reaches carrying capacity, often represented by an S-shaped curve.

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What is a limiting factor?

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A limiting factor is a resource or condition that limits the growth, abundance, or distribution of a population.