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19 Cards in this Set
- Front
- Back
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Density:
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Number of individuals per unit area
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Ways of determining density:
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Counts, sample size estimate, indirect indicators, mark-recaptured
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Dispersion:
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pattern of spacing
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random Dispersion
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unpredictable, patternless spacing
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clumped Dispersion
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patchy aggregation
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uniform Dispersion
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even spacing
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Demography:
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factors that affect growth and decline of populations
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Birthrate:
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number of offspring produced
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Death-rate:
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mortality
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Age structure
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relative number of individuals of each age
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Survivorship curve
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plot of numbers still alive at each age.
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Population growth models: Exponential model
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*idealized pop. in an unlimited environment *J-curve *r-selected species (r= per capita growth rate)
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dN/dT=1.0N
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Exponential Model
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Population growth models: Logistic model
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*carry capacity (K): maximum pop. size that a particular environment can support *s-curve *k-selected species
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dN/dT=1.0N(K-N/K)
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logistic model
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Population life history "strategies": r-selected (opportunistic)
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*Short maturation and lifespan *Many (small) offspring, usually early reproduction; no parental care *high death rate
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Population life history "strategies": k-selected (equilibrial)
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*long maturation and lifespan * few (large) offspring; usually several (late) reproductions;extensive parental care *low death rate
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Population limiting factors: Density dependent factors
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*competition *predation; stress/crowding, and waste accumulation
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Population limiting factors: Density independent factors
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*Weather/Climate
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