Abstract
Males of Habropoda pallida searched for recently emerged females at a location in central Arizona where many females had nested in the preceding year. Patrolling males exhibited a variety of mate locating tactics ranging from inspecting existing emergence holes to patrolling flights around flowering creosote bush. These tactics appear to be under the control of a conditional strategy, given that male behavior shifted during the day. Moreover, some marked males mounted dead females placed on the ground in the emergence area as well as mounting dead females pinned to flowers in the emergence area and at a creosote bush some distance away. At least some males exhibited site fidelity in that numerous males marked within the nest site emergence area were recaptured there; others marked at a creosote bush were also seen again at that plant. The mating system of the bee involves scramble competition with individual males attempting to locate receptive emerging and flower-visiting females before rival males. In keeping with the scramble competition hypothesis, males are considerably smaller on average than females and are only aggressive when trying to push their way past rival males already mounted on a potential mate.
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