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- a. Density dependent birth & death
- b. DD for birth, DI for death
- c. DI for birth, DD for death
- DD: # of individuals influences growth rate
- Y: birth or death rate per capita
- X: population density
- equilibrium density in middle
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- a. Plantain. (Y)log scale of seeds per individual (X) log of plants per m2
- b. song sparrow (Y) ave clutch size (X) females per unit area
- Density dependent
- population regulation-competition for resources
- negative feedback
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- Density dependent population regulation
- negative feedback
- Cheetah use chemical communication to mark territorial
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- Density Dependent Population Regulation
- negative feedback
- Territoriality
- Colonial nesting
- strongest in middle
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- Population Dynamics
- Isle Royale Moose
- larger animals more stable?
- fluctuations from weather and predation
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- population dynamics
- Dungenese crab population
- (Y) order of magnitude factors of 10-kg log scale
- (X) year
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- Metapopulations & Immigration
- nearer island=more immigration
- ecological vacuum- it will get filled by mainland birds
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- Boom-and-Bust cycles
- (X) year (Y) left side hare pop, right side lynx pop (thousands)
- predator prey oscillations
- phased shift
- study by Hudson Fur
- lynx & hare
- lynx supplemental fed on other prey
- hares less food, weaker, easier prey
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- exponential growth of humans
- J curve
- (X) year (Y) human population (billions)
- The Population Bomb
- Paul Ehrlich
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- rate of increase
- human population
- (Y) annual percent of increase
- (X) year 1950-2050
- approaching K
- increasing @ decreasing rate
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- ZPG-2 ways Demographic transition
- (Y) birth or death rate
- (X) year 1750-2050
- Sweden: normal
- Mexico: fluctuating
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- Population Pyramids
- (Y) age
- (X) top: male/female bottom: % of pop
- a. afgan b. US c. Italy
- predicts growth
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- a. Infant mortality
- (Y) deaths per 1,000 births
- (X) developed v developing countries
- b. (Y) Life expectancy years
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- Ecological footprint per country
- (Y) ecological footprint per person
- (X) available ecological capacity per person
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