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Transcript

Developing

an

Equation

Population Factors

-Birth (Natality)

-Death (natural / due to predation) (Mortality)

-Resources for animals (food, water,

space for shelter & reproduction)

-Resources for plants (space, sunlight, water, mineral nutrients)

-Migration (Immigration / Emigration)

Bacteria

Density Dependent Factors

P=P0 x r

Sexually reproducing species

A factor that directly relates to the competition between individuals for food, water and shelter

Exponential growth

These factors amount to what is known as the carrying capacity of the habitat

Population reaching carrying capacity

P = P0 + (r x P0)

Population Dynamics

Oscillating over carrying capacity

The study of population sizes and ages as a dynamic (constantly changing) system, and the environmental and biological factors that drive them.

Graphing the Data

Density Independent Factors

Populations growth increasingly inhibited by resources becoming limiting

Extinction

Chaos

A factor that will have a similar

effect regardless of population size or habitat capacity

(K - P0) / K

Put it all together for a real sexually reproducing species

Population Variables

P = P0 + ((r x P0) x ((K - P0) / K))

-P = subsequent (new/following) year’s population

-P0 = previous year’s population

-r = population growth rate, encompassing

-R+ = births & immigration

-R- = deaths and emigration

-K = carrying capacity of habitat

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