Term
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Definition
| individuals of a single species that simultaneously occupy the same general area: they rely on the same resources, are influences by similar environmental factors, and have a high likelihood of interacting with one another |
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Definition
| number of individuals per unit of area or volume |
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Definition
| pattern of spacing among individuals with the geographical boundaries of the population |
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Definition
| animals are captured, marked, and released. After a while animals are recaptured to detemine population size based on % |
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Definition
| most common pattern of dispersion with individuals in aggregated patches |
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Definition
| evenly spaced individuals within a population |
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Definition
| unpredictable, patternless dispersion occurs in the absence of strong attractions or repulsions amoung individuals |
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Term
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Definition
| study of the factors that influence the distribution of species over its range |
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Definition
| study of vital statistics that affect population size |
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Definition
| relative number of individuals of each age |
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Definition
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Definition
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Definition
| average span between birth of an individual and birth of their offspring |
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Definition
| proportion of individuals of each sex |
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Definition
| group of individuals of the same age |
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Definition
| plot of the numbers in a cohort still alive at each age |
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Term
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Definition
| traits that affect an organism's schedule of reproduction and death |
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Term
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Definition
| organisms, such as insects, that expend their energy in a single large reproductive moment, and then die |
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Definition
| organisms that produce fewer offspring at a time over a span of many seasons |
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Term
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Definition
| per capita birthrates and deathrates are equal and r=0 |
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Term
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Definition
| maximum population growth |
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Term
| exponential population growth |
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Definition
| J shaped curve; unchecked population growth |
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Term
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Definition
| maximum population size that a particular environment can support with no net increase or decrease over a relatively long period of time |
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Term
| logistic population growth |
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Definition
| growth that incorporates the effect of population density on r, K selected species |
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Term
| K selected organisms (equilibrial populations) |
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Definition
| living at or near the carrying capacity, long maturation time and life span, few offspring with extensive parental care |
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Term
| r-selected populations (opportunistic) |
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Definition
| populations that often live in variable climates; short maturation and life spans, many offspring with no parental care |
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Term
| intraspecific competition |
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Definition
| individuals of the same species fighting for limited resources |
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Term
| density-dependent factors |
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Definition
| amount of food, shelter, water, nesting areas are limited brought on by high numbers of organisms |
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Term
| density independent factors |
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Definition
| factors that influence population size, but are unrelated to number of organisms Ex: fires, freezing |
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