sampling

Question 1

why sample?

Answer 1

• Used to estimate population size & distribution.
• Reduces time & effort compared to counting everything.

Question 2

sampling methods

Answer 2

• Random Sampling – avoids bias.
• Use a random number generator to place quadrats.
• Systematic Sampling
• along a gradient.
• Place quadrats at regular intervals (e.g., transect line).
• Mark-Release-Recapture
• for mobile organisms.
• Capture, mark, release, then recapture.
• Kick Sampling – for aquatic organisms.
• Kick riverbed, use net to collect disturbed organisms.

Question 3

estimating population size

Answer 3

(total area of habitat / area of sample unit) x mean number of individuals per sample unit

Question 4

what to consider

Answer 4

• Sample size must be large for accuracy.
• Standardization ensures fair comparisons.
• Avoid harm to organisms & habitats.