Discuss the factors which influence the size of the population in ecosystem

Factors which influence the size of the population in ecosystem

• Natality or birth rate; this is the rate at which new members are added to the population by reproduction. Birth of younger ones increases the population size.
• Mortality or death rate; the rate at which individual die, the higher the death rate, the higher the rate of decrease in the population.
• Immigration rate; organisms moving into the population increase its size
• Emigration rate; organisms moving out of the population decreases its size.
• Environmental factors; changes in environment factors affect population size. These can be biotic or abiotic.

Abiotic factors that affect population size includes

• Whether, this include daily duration of the sun and its intensity, rainfall, humidity and temperature. Most organisms adapt to live in specific whether conditions. Their population increase when favorable conditions prevail and decrease when unfavorable conditions prevail.
• Natural calamities such as feminine, flood, drought, fire, earthquake cause large scale down of the population
• Availability of food and space are limiting factors to the population. When food, water and space are available the population increase in size. Otherwise the population decreases in size

The biotic factors include

• Predator prey relationship: availability of the prey, the population of predators increase while increase in the population predator reduces the population of the prey.
• Disease reduce the population organism
• Parasites only exist where there is the hosts

Inter and intraspecific competition; increase in competition of organisms for resources reduce the population of the organism.

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