Unit 5 - Factors that Affect Pop Growth

Question 1

two common growth factors

Answer 1

exponential and logistic

Question 2

Exponential Growth

Answer 2

this occurs when there r unlimited resources and no competition so the pop skyrockets

Question 3

Logistic Growth

Answer 3

this starts with exponential growth, but then growth slows as pop increases, resources bc limited and finally the carrying capacity of an ecosystem is reached

Question 4

carrying capacity (K)

Answer 4

is the maximum pop size that can be sustained in an environment for a long time

Question 5

Limiting Factor

Answer 5

is a property of a pop environment - living or nonliving controls the process of pop growth

Question 6

two major limiting factors

Answer 6

1) density-dependent factor
2) density-independent factors

Question 7

Density Dependent factor

Answer 7

a factor that is influenced by pop density having a greater impact as the pop density increase

Question 8

Biotic Factors

Answer 8

slow a pop growth as pop nears its carrying capacity. These biotic factors often lead to
- sinusoidal growth patterns where the pop size fluctuates around K

Question 9

examples of density-dependent factors (4)

Answer 9

1) competition
2) predation
3) disease
4) space limitations

magnitude of these factors is directly proportional to the size of the pop

Question 10

competition

Answer 10

an interaction in which both competing pop lose access to some resources

Question 11

two types of competition

Answer 11

1) intraspecific competition
2) interspecific competition

Question 12

Intraspecific Competition

Answer 12

• within a species
  when the pop size is large membranes of the same species compete w each other for:
  food
  breeding sites
  shelter
  water
  sunlight
  soil
  nutrients

Question 13

Interspecific Competition

Answer 13

• between different species
  when two diff species share a similar habitat, they can compete for resources. This indicates that the species have similar niches

Question 14

competitive exclusion principle

Answer 14

leads to the competitive exclusion principle which states that species with the same niche cannot co-exist; one will always exclude the other through evolution. this often leads to a change in the species

Question 15

Predation

Answer 15

the interaction between predator and prey

Question 16

lack of prediation

Answer 16

cause problems for the prey pop

Question 17

without predation

Answer 17

the prey pop can increase rapidly which can lead to a depletion of resources and can increase the risk of disease

Question 18

Disease in pop

Answer 18

also increases with the density of the pop
- high pop density increases spread of disease
- can have catastrophic effects on a pop, as well as on interacting pop within an ecosystem

Question 19

density-dependent; crowding (4)

Answer 19

• only occurs in hight-density pop with limited space
• affects growth, size, and survival of individuals in a pop
• grow slowly + small, weak and less likely to live
• increase disease spread

Question 20

not crowded enough ; allee effect

Answer 20

a density-dependent phenomenon that occurs when a pop cannot survive or fails to reproduce enough to offset mortality once the pop density is too low

Question 21

minimum viable pop size

Answer 21

is the least number of individuals that ensures the continued existence or a pop for a determined period of time, regardless of environmental change or disaster

Question 22

drops below minimum

Answer 22

viable pop size, the chance of extinction increases dramatically (size is only a prediction)

Question 23

density-independent factor

Answer 23

a factor that influences pop regulation, regardless of pop density

Question 24

density-independent or Abiotic factors…

Answer 24

cause a pop to stop growing or crash long bf the carrying capacity is reached. These factors usually produce sudden dramatic declines in a pop

Question 25

examples of density-independent or abiotic factors

Answer 25

heat waves, fires, earthquakes, floods, droughts, tornados, ice storms, mudslides

ie.environemtal factores