Eggs of Flood Water Mosquitoes III (Diptera, Culicidae). Conditioning and Hatching of Aedes Vexans1

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Abstract
Eggs of floodwater mosquitoes are capable of withstanding adversities such as drought, cold and unfavorable submersion. Once the eggs of a species have been subjected to adversity, a sequence of events called “conditioning” is required to predispose them to respond to the final stimulus. This sequence of events necessary for conditioning varies according to the species. Accordingly some may hatch shortly after the onset of any period of inundation in spring and summer; others respond to a hatching stimulus only as the ice breaks up late in the winter or early in the spring. Eggs of both groups refrain from hatching whenever they are flooded before they have been conditioned or prepared for hatching. Once eggs are conditioned, the ultimate stimulus to hatching of any of the species is a decreasing gradient of oxygen dissolved in the water under which the eggs are submerged (Borg and Horsfall, 1953).

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