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28 Cards in this Set
- Front
- Back
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population
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group of individuals of a single species in same area
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mark capture tecnique
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marking boxes + proportion of population size
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3 patterns of dispersion and most common
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clumped
random uniform |
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territoriality
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protection of own land
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demography
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statistics of population change...life/death rates
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2 methods of demography
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life tables
survivorship curves |
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life tables
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age specific summaries of life rate
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survivorship curve
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plot of population # as age increases...starts with 1000
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Type I, Type II, Type II survivorship curve
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see notes
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2 key changes in population
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reproductive rate and survivorability
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life history
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traits that effect reporduction and survival of a species
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big bang/ semelparity
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1 chance to reproduce
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repeated/ iteroparity
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many times to reproduce
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exponential model
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N/T = B-D
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per capita birth rate
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B = bN
% of being born |
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per capita death rate
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D = mN
% dying or can die |
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per capita rate of increase
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r = b-m
if > o, increase in pop. # |
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why kind of curve is exponential and what conditions?
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J shaped + unlimited resources, perfect environment
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logistic model
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S curve
N= pop size K = carrying capacity |
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Alle Effect
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if pop is too small, survial decreases...plants in wind example
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K selection
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density dependent
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R selection
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density independent
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if populations immigration + emigration rate is =, what does it depend on tehn to chang?
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birth + death rate
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density dependent regulation
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- feedback
competition for resources territoriality predation toxic wastes instrinsic factors |
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metapopulation
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grous of populations linked together by emigration, immigration
patchiness forms |
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3 reasons why populations fluctuate
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food shortage in winter
predator-prey food/resource limitation |
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ecological footprint
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summarizes the land + water appropriate for each nation to produce enough for its citizens
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ecological capacity
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actual resource base
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