exp 1.5 to carry out a quantitative survey of animals Flashcards
1
Q
what is the most commonly used techniques
A
capture recapture method
2
Q
what is the capture-recapture method used for
A
estimate number of animals in a habitat
3
Q
explain the capture-recapture method
A
1st visit: search for snails and mark each one with a small inconspicuous mark
record total numbered found and marked
place snails back in the same position
2nd visit: return back to same place and search for snails again taking note of the total number found and how many had a mark
use formula to estimate the no of snails in habitat
4
Q
why is it important that the mark is inconspicuous
A
ensures snail is not more visible to predators
5
Q
formula
A
no marked on visit 1 x total number caught on second visit divided by number of marked snails in 2nd visit
