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Just a note

The data used for the graph are the pooled results of 22 days marking - over which time the population size was assumed to have remained unchanged. The recapture rate has been multiplied by 1000. Marked flies recaptured on the day of marking were excluded from this analysis because they had not sufficiently mixed with the population.

Note that there is some evidence of oscillation of the recapture rate above and below the fitted line. This is due to cyclic availability of these insects to recapture. This occurs because the flies to be marked came to traps because most of them were hungry. Upon release the majority of them fed, and became less available to recapture by trapping until they needed their next blood meal - a few days later. Simulation studies suggest that this cycling may not unduly bias the population estimate.