Effects of continuous drought and immersion on hatchability of Ochlerotatus albifasciatus (Diptera: Culicidae) eggs stored at low temperature.

CAMPOS, R. E.; SY, V. E.; CASTRO, L.

REVISTA DE LA SOCIEDAD ENTOMOLóGICA ARGENTINA

Sociedad Entomológica Argentina

Lugar: Mendoza; Año: 2007 vol. 66 p. 131 - 136

0373-5680

The role of environmental factors on the hatching response of Ochlerotatus albifasciatus (Macquart) eggs is studied by simulating winter conditions in the laboratory. The hypothesis tested was that hatching response is affected by: (1) time that eggs remain at low temperature, (2) storage conditions, and (3) acclimatization time. Eggs were stored at 5ºC in drought and immersion conditions during 7, 21, 35, 90 and 146 days, immediately after, they were acclimatized at 22ºC during 24, 72, and 168 hours, and then eggs were flooded to induce hatching. Percent of hatched eggs was analyzed with a Generalized Lineal Model with a binomial distribution. Results show that: (1) a long storage period at cold temperature and long acclimatization periods improve the hatching response; (2) storage conditions have a moderate effect on hatching, being more evident in eggs stored dry; (3) a long time of acclimatization favors the hatching response in submerged eggs more than in eggs stored dry; (4) long time at cold favors the hatching response in eggs stored dry more than in submerged eggs; (5) the hatching response of eggs that remain for a long time at low temperature is higher when the time of acclimatization is long.