what are the advantages of mark recapture model
Answers
Answer:
They offer the advantage that accuracy does not depend on an assessment of the amount of habitat; their disadvantage is that accuracy does depend on capturing a large proportion of the population. Seber (1982,1986) reviews the statistical theory that underlies the mark-recapture approach.
Answer:
. SUMMARY OF ADVANTAGES AND DISADVANTAGES
The method is relatively costly as it is additional to one or more of the basic sampling techniques already described and it is restricted to the assessment of individual species.
This Symposium was conceived in the context of a need to debate the impact of environmental changes on fish stocks. We wish to be able to detect this impact simply, rapidly, and reliably, and we have considered many sampling methods. All require validation and the efficiency of the gear used needs to be measured.
Mark-recapture methods have been used explicitly to determine the efficiency of traps as instruments to measure the size of migrating salmonid populations. Lamarque (see p.173) mentioned the use of Petersen experiments to check the efficiency of electric fishing assessments. I suggest that the method can also be used to calibrate the capture instruments in still waters and then conditions can be defined for simple, rapid and cheap assessments of relative abundance thereafter. I have tried to show one way in which this may be done in my paper on Loch Leven trout (Thorpe, see p. 641). In this instance, a seining method is identified which produces the required results with less than 10 percent of the previous effort, no reward costs and much reduced laboratory analysis.
However, because of its intricacies, and the variety of subsidiary checks that must be made, it seems likely that its use will be restricted, as it is as present, to populations of particularly valuable species.