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Eco Evo Exam 3(c.12)
Definitions
| Term | Definition |
|---|---|
| Demography | The study of populations. |
| Growth rate | In a population, the number of new individuals that are produced in a given amount of time minus the number of individuals that die. |
| Intrinsic growth rate (r) | The highest possible per capita growth rate for a population. |
| Exponential growth model | A model of population growth in which the population increases continuously at an exponential rate. |
| J-shaped curve | The shape of exponential growth when graphed. |
| Geometric growth model | A model of population growth that compares population sizes at regular time intervals. |
| Doubling time | The time required for a population to double in size. |
| Density independent | Factors that limit population size regardless of the population's density. |
| Density dependent | Factors that affect population size in relation to the population's density. |
| Negative density dependence | When the rate of population growth decreases as population density increases. |
| Positive density dependence | When the rate of population growth increases as population density increases. Also known as inverse density dependence or the Allee effect. |
| 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. |
| Carrying capacity (K) | The maximum population size that can be supported by the environment. |
| Logistic growth model | A growth model that describes slowing growth of populations at high densities. |
| S-shaped curve (sigmoidal curve) | The shape of the curve when a population is graphed over time using the logistic growth model. |
| Inflection point | The point on a sigmoidal growth curve at which the population achieves its highest growth rate. |
| Age structure | In a population, the proportion of individuals that occurs in different age classes. |
| Life tables | Tables that contain class-specific survival and fecundity data. |
| Stable age distribution | When the age structure of a population does not change over time. |
| Generation time (T) | The average time between the birth of an individual and the birth of its offspring. |
| Cohort life table | A life table that follows a group of individuals born at the same time from birth to the death of the last individual. |
| 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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