Population is a group of organism of the same species, living in an environment or location at the same time interbreeding together.
Is a branch of ecology that deal with the structure and dynamic species population and how this population interacts with the environment. Population size: is the number of Individual or organism living in a particular area.
Population density: is number of individual or organism per unit area or volum.
Natality: is the number of individual added to the population through productivity in a givien time.
Mortality: is the number of death in a population in a particular time.
Population growth rate: this is the birth rate – death rate is expressed in percentage
Survivorship curves: this is another way of measuring mortality. This curve show the proportion of individual likely to survive and individual that survive within a given cycle.
Four type of survivorship curves
i. Type I: life expectancy will decrease
ii. Type II: life expectancy will be Constance
iii. Type III and IV: life expectancy will vary.
Sex ratio: this is the ratio of male to female in a population
Age distribution or structure: the particular age of a population greatly determine the rate of the population
Type of individual in an age distribution
ii. Productive adult
iii. Post productive adult
A population that have mainly pre productive Juvenile are expected to grow in future, and a population with mainly productive adult will be growing. But a population with a population with post productive adult whose productive success is low will face low population
Population growth curve: a typical growth curve consist of
i. Log phase
ii. Lag phase
iii. Stable / equilibrium
Carry capacity: this is the number of population that a particular environment can support over a long period of time. And is number of individual that can be maintain in a particular environment.