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22 Cards in this Set
- Front
- Back
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Define demography. |
The study of populations. |
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What are the differences between growth rate and intrinsic growth rate? |
________ is the number of new individuals minus the number of individuals that die whereas ________ is the highest possible per capita growth rate for a population. |
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What is the formula for the exponential growth model? |
Nrt with < meaning the little number below and > meaning to the power off. |
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What does the J-shaped curve mean?
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The shape of the exponential growth when curved. |
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What is the geodetic growth model? |
A model of population growth that compares population sizes at regular time intervals. |
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What is the formula for geometric growth? |
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What is a self-thinning curve? |
A graphical relationship that shows how decreases in population density over time lead to increases in the size of each individual in the population, often has a slope of -2/3 |
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What is the logistic growth model?
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A growth model that describes slowing growth of population at high densities. |
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What is the formula of the logistic growth model? |
dB/dt =rN(1-N/K) |
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What does the s-shaped curve mean? |
The shape of the curve when a population is graphed over time using the logistic growth model. |
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What is an inflection point? |
The point on a sigmodial growth curve at which the population has its highest growth rate. |
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What does a life table contain? |
Class specific and fecundity data. |
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What is a cohort life table? |
A life table that follows a group of individuals born at the same time from birth to death of the last individual. |
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What is a static life table? |
A life table that quantifies the survival and fecundity of all individuals in a population during a single time interval. |
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What are damped oscillations? |
A pattern of population growth in which the population initially oscillates but the magnitude of the oscillation declines over time. |
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What is a stable limit cycle? |
A pattern of population growth in which the population continues to exhibit large oscillations over time. |
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What is the deterministic model?
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A model that is designed to predict a result without accounting for random variation in population growth rate. |
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What is the stochastic model? |
A model that incorporates random variation in population growth rate and assumes that variation in birth and death rates are due to random chance. |
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What is demographic stochasticity? |
Variation in birth rates and death rates due to random differences among individuals. |
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What is environmental stochasticity? |
Variation in birth rates and death rates due to random changes in the environmental conditions. |
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What is the formula that represents the proportion of occupied patches when colonization and extinction have reached an equilibrium? |
p=1-e/c |
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What is the rescue effect? |
When dispersers supplement a declining sub-population and thereby prevent it from going extinct. |
