Chapter 8.3

Biology From 4 Presentation 2015

Chapter 8.3Population Ecology

What is Population Ecology?Population ecology is branch of ecology that studies the structure and dynamics of populations.

What is population???A population is defined as a group of organisms of the same species occupying area.

What is Popular density?Population density is defined as the number of organisms per unit area of the habitat.

Population density can be affected by various factors:Abotic-pH value,light intensity,temperature,...Biotic-producers,consumers,primary consumersBirth rateDeath rateimmigrationEmigrationAnd MORE

Estimate the size and density of a population by using two method:Direct counting(small)Sampling(big)

What is quadrat sampling technique?Quadrat samping technique is used in estimating the size of plant population or to study the populations of immobile animals.

The Quadrat sampling technique can determine three things:a)Frequecyb)Densityc)PercentageFrequencyFrequency is the number of times a particular species is found present when a quadrat is thrown a certain number of times. number of quadrats containing the species number of quadratsX 100%Frequency=