Term
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Definition
| number of individuals that actually or potentially contribute to a gene pool |
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Term
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Definition
| the number of individuals in each of several age categories |
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Term
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Definition
| the pre-reproductive and reproductive individuals |
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Term
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Definition
| number of individuals in some specified area or volume habitat |
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Term
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Definition
| the pattern in which individuals are dispersed in a specific area |
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Term
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Definition
| sampling areas of the same size and shape |
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Term
| capture-recapture methods |
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Definition
| a way of sampling mobile animals by capturing animals and marking them |
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Term
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Definition
| arrival of new residents from pther populations of he same species |
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Term
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Definition
| departure of individuals thst take up permanent residense in some other place |
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Term
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Definition
| recurring round trip between two distinct regions |
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Term
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Definition
| an interval where the birth rate and death rate are balanced |
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Term
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Definition
| rates per individual/head count |
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Term
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Definition
| a quantity that is growing at a rate proportional to size. the larger a population's reproductive base, the greater will be the rate of growth in a specified interval |
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Term
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Definition
| maximum rate of increase per individual for any population that is growin gunder ideal conditions |
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Term
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Definition
| any essential resource that is in short supply |
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Term
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Definition
| maximum number of individuals that a given environment can sustain indefinately |
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Term
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Definition
| a small population strts to grow slowly then rapidly and then it levels off when the carrying capacity is reached |
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Term
| density dependant controls |
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Definition
| abiotic and biotic factors that reduce the odds of an indivual surviving |
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Term
| density independent factors |
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Definition
| deaths or fewer births happen regardless of population size |
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Term
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Definition
| set of adaptations that influence survival fertility and age |
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Term
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Definition
| a group of individuals recorded from the time they are born to the time they die |
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Term
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Definition
| a graph line that emerges when ecologists plot a cohort's survival in the habitat |
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Term
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Definition
| high survivorship until fairly late in life |
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Term
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Definition
| fairly constant death rate at all ages |
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Term
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Definition
| death rate highest at early stage in life |
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Term
| how have humans temporarily side-stepped environmental resistance to population growth? |
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Definition
| through inventions that combat disease, create transportation, and help with agriculture |
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Term
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Definition
| the average number of children born to the women of a population during their reproductive years |
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Term
| demographic transition model |
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Definition
| when changes in growth rates correlate with the four stages of economic developement |
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Term
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Definition
| before technology medical advances spread. birth and death rates low |
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Term
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Definition
| industrialization begins; death rates slow |
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Term
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Definition
| industrializaton;growth slows, people move to cities thus families want less children |
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Term
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Definition
| population growth rates negative;popualtion slowly decreases |
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