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10 Cards in this Set
- Front
- Back
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Population characteristics |
Size, density, distribution, age, structure, birth rates, death rates Lives in habitats |
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3 types of distribution |
1. clumped (clustered in groups 2. uniform (more or less equally dispersed) 3. Random (randomly dispersed) |
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In most cases... |
it is impossible to count all individuals in a population |
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Mark and Recapture Technique |
animals are captured, marked and then recaptured to obtain data |
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Pop ecologists can estimate density from some..... of population size |
index might involve: counting nests, burrows, tracks, fecal droppings |
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demography |
study of factors that affect the growth and decline of population |
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immigration vs. emigration |
immigration: birth and immigration increase population emigration: death and emigration decrease population |
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Life table |
age specific summary of the survival pattern of a population tells the probability that a person of that age will die before his or her next birthday |
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Cohort life table |
refers to mortality rate of an entire populations lifetime difficult to collect on wild animals because it is hard to follow wild animals throughout their entire life |
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types of survivorships |
Type 1. humans and large mammals Type 2. small rodents, some birds and lizards Type 3. oysters, mollusks |
