4. Reproductive Patterns
I. POPULATION GROWTH The way a population reproduces and
produces offspring over time.
Population growth is affected by four
factors:
Birth – adds individuals to the population.
Death – removes individuals from the IV. CARRYING CAPACITY
population. Carrying capacity is the number of
Immigration – individuals entering a organisms that can be supported by a given
population. environment.
Emigration – individuals leaving a
population. Factors Related to Carrying Capacity
The ecosystem's carrying capacity is
Population Change Formula affected by the availability of:
Population change = (birth + immigration) − - Food
(deaths + emigration) - Shelter
- Water
II. POPULATION DENSITY - Mates
As a population gets closer to its carrying
Population density is the number of capacity, its growth slows down.
individuals occupying a particular area.
Relationship Between Population Growth
Population Density Formula and Carrying Capacity
- When there are few individuals
compared with the amount of
resources, the population can grow
quickly.
- As the population increases and
III. OTHER POPULATION approaches carrying capacity, growth
CHARACTERISTICS slows down.
- Eventually, population growth levels off.
1. Spatial Distribution Patterns
The ability to spread and occupy a specific
area.
V. MODELS OF POPULATION
2. Geographic Range GROWTH
The area inhabited by a certain population. A. EXPONENTIAL GROWTH MODEL
Exponential growth happens when:
3. Age Structure - Resources are unlimited
The distribution of a population in terms of - Organisms have a uniform reproductive
age and sex. It determines which members pattern.
of the population have reached the The exponential growth model produces a
reproductive years. J-shaped curve graph because of steady
and continuous growth.
I. POPULATION GROWTH The way a population reproduces and
produces offspring over time.
Population growth is affected by four
factors:
Birth – adds individuals to the population.
Death – removes individuals from the IV. CARRYING CAPACITY
population. Carrying capacity is the number of
Immigration – individuals entering a organisms that can be supported by a given
population. environment.
Emigration – individuals leaving a
population. Factors Related to Carrying Capacity
The ecosystem's carrying capacity is
Population Change Formula affected by the availability of:
Population change = (birth + immigration) − - Food
(deaths + emigration) - Shelter
- Water
II. POPULATION DENSITY - Mates
As a population gets closer to its carrying
Population density is the number of capacity, its growth slows down.
individuals occupying a particular area.
Relationship Between Population Growth
Population Density Formula and Carrying Capacity
- When there are few individuals
compared with the amount of
resources, the population can grow
quickly.
- As the population increases and
III. OTHER POPULATION approaches carrying capacity, growth
CHARACTERISTICS slows down.
- Eventually, population growth levels off.
1. Spatial Distribution Patterns
The ability to spread and occupy a specific
area.
V. MODELS OF POPULATION
2. Geographic Range GROWTH
The area inhabited by a certain population. A. EXPONENTIAL GROWTH MODEL
Exponential growth happens when:
3. Age Structure - Resources are unlimited
The distribution of a population in terms of - Organisms have a uniform reproductive
age and sex. It determines which members pattern.
of the population have reached the The exponential growth model produces a
reproductive years. J-shaped curve graph because of steady
and continuous growth.
