| Abstrakt: |
As with several other aedines, hatching of eggs of Aedes sierrensis (Ludlow) is induced by depletion of the dissolved oxygen of the flooding medium; but, in contrast to many of those others, appreciable hatching is obtained only when the dissolved oxygen is reduced to a very low level (0.25 ppm or less). Newly matured eggs undergo a brief increase in the threshold of stimulation necessary to induce hatching. The cause for this was not determined, but moisture conditions (which frequently cause this kind of effect) were ruled out; the altered responsiveness appears to arise spontaneously within the unhatched larva. Embryogeny requires 8–15 days at 25°–27°C; the larval and pupal stages, about 16 days. These developmental rates are much slower than those of A. aegypti, which requires 3–4 days and about 9 days, respectively, for these processes. |
