23.5

Question 1

Why should the measurement of distribution be systematic?

Answer 1

• different areas within an ecosystem are identified
• these areas vary in their abiotic conditions
• random sampling might miss some areas

Question 2

How is distribution measured?

Answer 2

• using a transect

Question 3

How is abundance measured?

Answer 3

• using quadrats

Question 4

When should a one or belt transect be used?

Answer 4

• line: involves taking samples at regular intervals along a linear tape. Gives distribution but not abundance
• belt: involved recording species within two parallel lines. Gives distribution and abundance

Question 5

What is the equation for population size?

Answer 5

Number of individuals in sample/area of sample

Question 6

What is the equation for population size? (Capture-recapture) (Lincoln’s index)

Answer 6

(First sampled x second sample) / recaptured individuals