A population is a group of organisms of the same species, living in an environment or location at the same time interbreeding together.
Is a branch of ecology that deals with the structure and dynamic species population and how this population interacts with the environment.
the number of individuals or organisms living in a particular area.
the number of individuals or organisms per unit area or volume.
the number of individuals added to the population through productivity in a given time.
the number of death in a population at a particular time.
Population growth rate:
this is the birth rate – the death rate is expressed in percentage
this is another way of measuring mortality. This curve shows the proportion of individuals likely to survive and individuals that survive within a given cycle.
Four types of survivorship curves
- Type I: life expectancy will decrease
- Type II: life expectancy will be Constance
- Type III and IV: life expectancy will vary.
this is the ratio of males to females in a population
Age distribution or structure: the particular age of a population greatly determines the rate of the population
Type of individual in an age distribution
- Pre productive juvenile
- Productive adult
- Post-productive adult
A population that has mainly pre-productive Juvenile are expected to grow in the future, and a population with a mainly productive adult will be growing. But a population with post-productive adults whose productive success is low will face low population
Population growth curve:
a typical growth curve consists of
- Log phase
- Lag phase
- Stable / equilibrium
this is the number of populations that a particular environment can support over a long period of time. And is a number of individuals that can be maintained in a particular environment.