2.2 Study Guide Flashcards

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1
Q

How does birth, death, immigration, and emigration each affect pop growth.

A

Birth: more births means more population
Death: decreases population so lowers is, counteracts birth
Emigration: things exiting the ecosystem, leaving, decreases the growth rate
Immigration: things entering the ecosystem, counteracts emigration

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2
Q

What does a Logistic graph look like?

A

Have a (K) maximum cap point
Curve that can go up or down, but normally shouldn’t go past the cap

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3
Q

What does an Exponential graph look like?

A

line increasing, shouldn’t have a cap or significant steady curve like logistic does.

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4
Q

What do variables N, N0, r, t, K, dN/dt stand for?

A

N= total pop.
No= initial pop size
r; max per capita growth rate
t= time
K= carrying capacity
dN/dt= pop growth rate

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5
Q

What do Density-dependent factors mean and examples?

A

Factors that affect population based on the density

Ex. disease, social behavior

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6
Q

What do Density-independent factors mean and examples?

A

Factors that affect the population are not based on the density.

Ex. Abiotic, sunlight, drought

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7
Q

What happens in a logistic graph when K is increased?

A

N can go up

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8
Q

What happens in a logistic graph when r is increased?

A

The population decreases

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9
Q

What happens when you increase N?

A

R goes down, pop. gets bigger, nears K

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