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Population Growth - Coggle Diagram
Population Growth
Definitions + Terms
Population
- group of organisms
- of same species
- living in particular area
Biotic Potential
- reproductive potential (rate)
- of population
- under optimum environmental conditions
- with unlimited resources
-
Environmental Resistance
- restriction by environment
- on population
- reaching its max growth + biotic potential
-
due to
many factors
ABIOTIC - chemical/physical environment
- water
- nutrient supply
- light
- oxygen availability
BIOTIC - effects of other organisms
- food supply
- predation
- competition
- disease
- accumulation of waste
Carrying Capacity
- max no. of population
- that ecosystem can support
-
more resources (eg nutrients)
-
-
Population Growth Graph
stage 1
LAG PHASE
-
nutrient assimilation takes place
- bacteria activating genes
- producing appropriate enzymes to metabolise particular food substance
-
-
-
stage 4
DECLINE PHASE
other limiting factors:
- lack of light
- predation
- increased competition
- increase disease/parasitic infection
-
-
why?
- accumulation of waste
- nutrient supply run out
S-shaped Growth Curve
-
applies to populations of many species in particular circumstances
-
axis
- time on x axis
- change in no. organisms on y axis
- can be logarithmic scale
- means LAG PHASE shown as straight line
J-shaped Growth Curve
Density INDEPENDANT
population increases until some factor causes sudden reduction in size
- regardless of size of pop
-
factors
- factors affect same proportion of pop
- no matter what density
- usually abiotic
1.very rapid growth
- abundant nutrient availability in water
- temp + light levels increasing
-
3.sudden reduction in pop size
- environmental resistance suddenly effective