Population Ecology – Definition & Key Points

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TERMS	DEFINITIONS
Population	The number of individuals of specie living in the same area at the same time is called population.
Monospecific	Population of only one specie living in the same area then it is called Monospecifie.
Mixed or Polyspecific	Populations of different species living in the same area are called Polyspecific.
Population density	The number of individuals living in a unit area is called density.
Mortality	The rate at which the individuals are lost by death in a unit time is called mortality.
Dispersion	It is the random pattern of distribution of individual of a population over space
Population ---------------------------- ---------------------------- growth	The number of individuals of population or biomass increased in unit time is call population growth.
Seed bank	The storage of seed in the soil is called seed bank.
Demography	The study of the vital statistics that affect population size is called demography.
Age structure	The relative number of individuals of each age in population is called age structure.
Generation time	The average span between the birth of individuals and the birth of their offspring is Called generation time.
Sex ratio	The proportion of the individual of each sex in a population is called sex ratio.


Life tables	The tables showing mortality summaries of a population is called life table.
Cohort	Cohort is a group of individuals of same age from birth till their death.
Survivorship curve	A plot of the numbers of cohort alive at each age group is called survivorship curve.
Clutch	The number of offspring or seeds produced at each reproductive cycle by a plant is called clutch size.

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