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Definition
| A group of individuals of a single species living in the same general area. |
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| The number of individuals per unit area or volume. |
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| The pattern of spacing among individuals within the boundaries of the population. |
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| The influx of new individuals from other areas. |
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| The movement of individuals out of a population. |
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| The defense of a bounded physical space against encroachment by other individuals. |
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| The study of the vital statistics of populations and how they change over time. |
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| Age-specific summaries of the survival pattern of a population. |
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| Group of individuals of the same age; used when constructing a life table by following their fates from birth until all are dead. |
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| A plot of the proportion or numbers in a cohort still alive at each age. |
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| An age-specific summary of the reproductive rates in a population; aka fertility schedule. |
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| The traits that affect an organism's schedule or reproduction and survival (from birth through reproduction to death). |
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Definition
| A life history in which adults have but a single reproductive opportunity to produce large numbers of offspring, such as the life history of the Pacific salmon; also known as semelparity. |
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Definition
| A life history in which adults produce large numbers of offspring over many years; also known as repeated reproduction. |
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| Zero Population Growth (ZPG) |
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Definition
| Occurs when the per capita birth and death rates are equal (r=0). |
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| Exponential Population Growth |
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Definition
| Population growth under ideal conditions (access to abundant food; free to reproduce at their physiological capacity). |
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Definition
| The maximum population size that a particular environment can support. |
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| Logistic Population Growth |
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Definition
| A model describing population growth that levels off as population size approaches carrying capacity. |
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Definition
| The concept that in certain (K-selected) populations, life history is centered around producing relatively few offspring that have a good chance of survival. |
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| The concept that in certain (r-selected) populations, a high reproductive rate is the chief determinant of life history. |
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Definition
| Referring to any characteristic that is not affected by population density. |
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Definition
| Referring to any characteristic that is affected by population density. Includes competition for resources; territoriality; health; predation; toxic wastes; and intrinsic (psychological) factors. |
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Definition
| The study of how complex interactions between biotic and abiotic factors influence variations in population size. |
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Definition
| A subdivided population of a single species (factors in immigration and emigration along with birth and death). |
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Definition
| A shift from zero population growth in which birth rates and death rates are high to zero population growth characterized instead by low birth and death rates. |
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Definition
| The relative number of individuals of each age. |
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Definition
| The number of infant deaths per 1000 live births. |
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Definition
| The predicted average length of life at birth. |
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Definition
| A method of using multiple constraints to estimate the human carrying capacity of Earth by calculating the aggregate land and water area in various ecosystem categories appropriated by a nation to produce all the resources it consumes and to absorb all the waste in generates. |
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