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Flashcards in Population Growth Deck (14)
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1
Q

per-capita rate of increase (r)

A

brith rate - death rate

2
Q

intrinsic rate of increase (r max)

A

rate @ which population will grow under optimal conditions

  • fixed number for each speci
  • max growth rate

ΔN/Δt = r max N

(ie) high birth rates
(ie) low death rates

3
Q

exponential population growth

A

increase in population size when r = constant

  • density independent
  • cannot continue indefinitely
4
Q

density independent

A

(population ecology) any characteristic that does not vary w/ population density
- abiotic

5
Q

density dependent

A

(population ecology) any characteristic that varies depending on population
- biotic

6
Q

carrying capacity (K)

A

max. population size of a certain species that a given habitat can support
- density dependent
- changes yearly, depends on conditions

7
Q

logistic population growth

A

density-dependent decrease in growth rate as population size approaches carrying capacity

  • density dependent
  • forces curve to level off

ΔN/Δt = r max N[(K-N)/K]

8
Q

N

A

number of individuals in population

9
Q

r variations

A

(1) birth > death = +r
(2) birth < death = -r
(3) birth = death -> static

10
Q

+r

A

growing population

11
Q

-r

A

declining population

12
Q

r max variations

A

(1) diff btwn species
(2) same w/in species
(3) diff. btwn similar population in diff. time or space

13
Q

why exponential growth happens?

A

(1) few individuals find a new population & habitat

(2) small population survived natural disaster & are recovering

13
Q

K is dependent on

A

(1) food
(2) space
(3) water
(4) soil quality
(5) resting & nesting sites
(6) weather/climate