Fire And Population

Question 1

Population

Answer 1

Members of a species in one place at a time

Question 2

Population formula

Answer 2

R = (b+I) - (d+e)
B - birth rate 
I - immigration rate 
D - deaths
E - emigration

Question 3

Population density

Answer 3

• number of individuals in an area

- amount of biomass

Question 4

Carrying capacity

Answer 4

• population that an environment can support

- if a population overshoots the carrying capacity limiting factors come into effect

Question 5

Density dependent

Answer 5

• disease competition predators

- disease can spread quicker in a population with members living close

Question 6

Density independent

Answer 6

• affects all populations regardless of density

- temp storms drought

Question 7

Measuring distribution

Answer 7

Random - irregularly spread, presences of other members doesn’t influence distribution eg plants
Clumped - individuals group together, presence of one individual increases likelihood of finding another eg herd
Uniform - even spacing, presence of individuals determines presence of others

Question 8

Fire low intensity

Answer 8

Positive 
- increase growth and density 
- stimulates germination 
- stimulates flowering 
Negative 
- loss of habitats
- reducing biodiversity
- change canopy structure

Question 9

Adaptations to fire

Answer 9

Bark thickness - insulates and protects cambium
Vegetation insulation - leaves and grass protecting it from the heat
Re sprouting - from buds underneath bark, soil is good insulator, buds underground are well protected therefore re sprout