Abstract
In a capture-mark-release-recapture experiment that was designed to elucidate robber fly behavior and life table properties, the collection procedure captured 38% of the estimated population of Efferia bicaudata (Hine). Marked flies inhabited an area that was at least 2.6-fold larger than the area sampled (0.73 versus 0.28 ha, respectively). Average area occupied per fly was at least 243 m2, at least 62% of which was shared with other occupants. Average daily survival rate was 0.7184, and average longevity was only 3 days per fly. The inhabited area was depleted by an average of 22.2 flies per day, but was replenished by an average of 15.4–21.5 new flies per day. Consequently, collections in the sampled area remained relatively uniform over a 21-day period.
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