4.3 Quadrat Samples

describe the use of quadrats as a technique for sampling the distribution of organisms in their habitat.
-use quadrat technique for sampling the distribution of organisms in their habitat.
-sample has to be random so there is no bias introduced and
-sample needs representative.
-sample needs to be large enough, so that the estimate of population is close enough to the true population as possible.

-set up grid system in area, it works like an x,y coordinates on a graph (grid must be equal sie)

-random numbers are needed to place quadrat in the squares.

-random numbers can be generated online or in tables.

-use of random numbers- generate number in x and y coordinate.

-random numbers generated -> 3 and 3. so grid will be at 3,3 (shown below)

-(assume that) each quadrat is one by one meter 

-count the number of daisies inside there.

-we need a representative sample- the bigger the better

                                                    - 10 quadrats or 10% of the area

-record data in a table (shown below)

-quadrat number & number of daisies for heading

-add up number of daisies divide number of quadrats.

-answer would give us the the number of daisies per meter square.

-this technique can be used to estimate the population of daisies in the field 

-we can also compare the number of daisies in many areas.