B16.3 Distribution and abundance

Question 1

What is the is the simplest way to count the number of organisms ?

Answer 1

Use a quadrat - square frame laid on the ground to outline sample area

Question 2

What do Quadrats mainly use?

Answer 2

Random measurements to determine overall picture of the population - ensures your result will reflect true distribution of the organisms

Question 3

What is quantitative sampling?

Answer 3

Taking mean samples of the random readings

Question 4

What is a transect?

Answer 4

A line allowing a study of a particular place

Question 5

What are transects used for?

Answer 5

A particular section of a habitat allowing for the impact of different abiotic factors to be taken into place

Question 6

How are transects placed?

Answer 6

Placed across areas of high/low density
Quadrats placed at regular intervals
Both at high and low areas
Calculate mean by area/ quadrants
Compare

Question 7

What are the differences between quadrats and transect?

Answer 7

Quadrats are often used along transects, combining techniques.
Quadrats were used for random measurements to determine an overall picture of the population or distribution of organism/ variety of organisms.
Transects used for the specific study of a particular section of habitat, measuring zonal changes