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30 Cards in this Set
- Front
- Back
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Researchers study _________, ___________, _______, _______________
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populations' geographic range, density and distribution, growth rate, and age structure
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this refers to the number of individuals per unit area.
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population density
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the number of males and females of each age a population contains
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age structure
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the area inhabited by a population
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geographic range
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this determines whether the size of the population increases, decreases, or stays the same
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growth rate
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What factors affect population size?
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birthrate, death rate, and the rate at which individuals enter or leave the population
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the process of individuals moving into an area from elsewhere
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immigration
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the process of individual leaving a certain area
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emigration
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what happens in exponential growth?
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the larger a population gets, the faster it grows
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Under ideal conditions with unlimited resoures, a poulation will ________
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grow exponentially
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What are the three phases of growth?
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Exponential growth, Growth slows down, Growth stops
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_____ occurs when a population's growth slows and then stops, following a period of ___________.
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Logistic growth, exponential growth
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the maximum number of individuals of a particular species that a particular environment can support.
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Carrying capacity
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a factor that controls the growth of a population
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limiting factor
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Acting separately or together, limiting factors determine the _________ of an environment for a species
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carrying capacity
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Population Size can be limited by...
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competition, predation, parasitism and disease, unusual weather, and natural disaster
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the number of organisms per unit area
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population density
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______ operate strongly only when population desity reaches a certain level
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density-dependent limiting factors
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what are the desity-dependent limiting factors?
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competition, predation, herbivory, parasitism, disease, and stress from overcrowding
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_______ affect all populations in similar ways, regardless of population size and density
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desnity-independent limiting factors
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Unusual weather sucha as hurricanes, droughts, or floods, and natural disasters such as wildfires, can act as _______
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density-independent limiting factors
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the ______ population, like populations of other organisms, tends to increase.
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human
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the combinations of _______ and ________ led to exponential growth
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lower death rates and higher birth rates
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Malthus suggested that only ___, _____, and _____ limit human population growth
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war, famine, and disease
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the scientific study of human populations
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demography
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what three things help predict why some countries have high growth rates while other countries grow more slowly?
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birthrates, death rates, and the age structure of a population
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a dramatic change from high birthrates and death rates to low birthrates and death rates
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demographic transition
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what diagrams help to understand population growth in different countries?
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age-structure diagrams
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To predict how the world's human population will grow we look at ________.
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the age structure of each country and the effects of diseases on death rates
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Current data suggests that global human population will grow more ___ over the next 50 years
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slowly
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