Aedes triseriatus and Aedes hendersoni : 1 Vertical and Temporal Distribution as Measured by Oviposition 2

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Abstract
A field study of oviposition activity by Aedes ( Protomacleaya ) triseriatus (Say) and A. ( P .) hendersoni Cockerell in southern Wisconsin revealed differences in both the vertical and temporal distribution of eggs laid by these 2 closely related treehole breeding mosquitoes. Oviposition was measured by the number of eggs laid in can-traps at ground level and at 3, 6, and 9 m above ground level. A. triseriatus exhibited strong preference for oviposition at ground level, 69% of its eggs being laid in ground-level traps, while A. hendersoni was much more arboreal, depositing only 26% of its eggs in ground level traps. Oviposition activity of both species was considerably reduced during weeks when mean temperature was approximately 18°C or lower. The period of high oviposition activity by A. triseriatus extended for a period of 10 wk, from the week ending July 3 through the week ending Sept. 4. The period of maximum oviposition activity by A. hendersoni was much shorter, extending through only 4 wk, from the week ending July 3 through the week ending July 24.

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