Population Ecology – Definition & Key Points

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




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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