12 Jun UFV BIOLOGY 101 – Exercise2 Estimating population size
Question
Exercise2: Estimating population size: mark-recapture
Data Table 2: Mark-recapture
Marked
(M)
Total captured (n)
Recaptured marked (m)
N
estimate
Standard error
Confidence Interval (low, high)
Capture
1st
Recapture
2nd
Recapture
3rd
Recapture
4th
Recapture
True population size
Exercise2: Estimating population size: mark-recapture
A. What happened to the estimate asyou performed subsequent recaptures?
B. Whathappened to the standarderror for each recapture phase?
C. Whathappened to the 95% confidence interval foreach recapture phase?
D. How close was your final estimate tothe true number of individuals?
E. In an actualresearch study, how might the time between recapture events influence the accuracyof your estimate?
F. Why might non-invasive techniques, such as fecal sampling and hair traps, be preferable to capturing and marking individuals?
G. Besides population size, what are otherimportant things to know about a population in order toproject its growth?
H. You have captured and marked 51 individuals in a populationof dusky-footed woodrats(Neotomafuscipes). In a subsequent recapture phase, you captured 65 individuals of which 34 had been previouslymarked. Estimatethe population size, the standard error of your estimate,and the 95% confidence interval.
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