Sampling Methods

Three Types of Sampling Methods

1.) Random Point Survey– A random point survey uses randomly-selected

points in a study are to characterize a site– Population selected in a manner that ensures

that each member of the population has an equal chance of being selected

– More points = more accurate data

Three Types of Sampling Methods

2.) Quadrat Survey– A quadrat is a plot of a fixed size in which

density of objects can be measured– Plots usually circular or Squared– Main goal is that scientists want to know the

number of objects per unit area (density)

Three Types of Sampling Methods

3.) Core Sample– A core sample is obtained by inserting a hollow

tube-shaped device into the bottom sediments to retrieve a tube full of sediments with its accompanying organisms