Population growth

Nota:

• ~A growth that has unlimited resources

1. Population growth size increases
   1. Reaches its Carrying Capacity

      Nota:

      • ~ The maximum number of organism that an ecosystem can support.
      • ~ The population has reached its carrying capacity if the resources are near its limit
      1. Limiting Factors

         Nota:

         • ~A feature in the ecosystem that restricts the population growth size.
         • ~ Limiting factors decides the Carrying Capacity
         1. Food
         2. Water
         3. Predation
         4. Habitat
         5. Disease
      2. Can Carrying Capacity change?

         Nota:

         • ~ Yes it can, when the Carrying Capacity decreases, the population growth size also decreases.
         1. Factors that can decrease a Carrying capacity:
            1. Seasonal Change

               Nota:

               • ~ Summer ~ Winter ~ Autumn ~ Spring
            2. Human activity

               Nota:

               • ~ Deforestation ~ Water Pollution ~ Air Pollution ~ Exploitation of marine life ~ Extinction of species ~ Global warming ~ Habitat destruction
            3. Natural disasters

               Nota:

               • ~ Volcanic Eruptions ~  Typhoons/Hurricanes ~ Tornados ~ Earthquakes/Tsunamis
2. First Population growth

Nota:

• ~ A growth that is limited to its resources
• ~A growth that takes account of Carrying Capacity

1. No overall increase in population growth
2. The Real Population growth

Nota:

• ~ A group of organism of the same species that lives together in a particular area.

1. Ecosystem

   Nota:

   • ~ A group of organisms that live together in a particular area, along with the nonliving things in which they interact.
2. Population size

   Nota:

   • ~ The total number of individual in a population
   1. Formula for Finding the Population Size
      1. x(t)= x0 * (1+r)^t

         Nota:

         • Legend: ~ x ; population size ~ t ; number of years ~ x0 ; initial population ~ r ; rate of growth % ~ * ; multiplication
3. Population density

   Nota:

   • ~ The number of individual in a population, per unit area