Mark-release-recapture

Question 1

Initial sample taken

Answer 1

Capture organisms of a species
Mark them so we know they in original sample
Count how many sampled = sample of population

Question 2

Marking on initial sample taken must….

Answer 2

Not affect survival of them eg is toxic or make them more visible to predators
Resistant to water etc

Question 3

Release of initial sample

Answer 3

Back into original population and leaves enough time to randomly disperse into rest of population

Question 4

Second sample taken

Answer 4

Count number that was marked from original sample that was recaptured in second sample

Question 5

How to find estimate for population

Answer 5

Number in first sample x number in second sample
____________divided by___________
Number marked in second sample

Question 6

Assumption

Answer 6

The population size is constant so no new births, deaths, nor migration
Animals redistribute evenly

Question 7

Ethics

Answer 7

Non toxic to animals - marking
Does not increase chance of predation if marked
Does no reduce chance of reproduction if marked
Captured in a way that causes no harm

Question 8

Why is the population size estimate inaccurate?

Answer 8

Due to assumptions