Volume 9, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



and were subjected to a comparative study on the role of temperature in growth, longevity, respiration, fat accumulation and utilization, and egg production. In both subspecies, the lower the temperature the longer was the developmental time, the heavier was the body weight, the greater was the amount of fat, and the longer was the wing length. However, the proportion of fat in the mosquitoes reared at all temperatures remained constant. In both subspecies sugar-fed mosquitoes stored a large amount of fat, although this was not as great as that observed in females caught in nature during winter. The lower the temperature the lower was the rate of oxygen consumption. The sugar-fed mosquitoes consumed oxygen at a higher rate than did young and unfed mosquitoes. Young and unfed mosquitoes of both subspecies had the same rate of oxygen consumption; but following sugar feeding, this rate was significantly higher in than in . The rearing temperature had no effect on the rate of oxygen consumption of the adult mosquitoes. The dry body weight of previously sugar-fed and decreased during simulated hibernation; however, the rate of fat decrease in was greater than in . At the time when females were dying, their fat content was almost twice that of ; at this time the surviving females outnumbered females by 3 to 1. As temperature decreased, the time required for blood digestion and for oviposition increased, and fewer females oviposited. At 5°C females digested their blood meals in about 60 days but no oviposition took place. On the other hand, did not survive long enough to digest their blood meals.

From the above experimental results it was concluded that (1) the larval rearing temperature has no effect on the ability of the emerging mosquitoes to go into hibernation directly. (2) Prior to overwintering, adult female mosquitoes require carbohydrates, or a combination of carbohydrates and a blood meal to carry them through the winter. (3) Females of southern , like those of northern , are capable of accumulating fat reserves if given a perhibernation carbohydrate diet. (4) Hibernating females outlive females because they are able to utilize their fat reserves, whereas can not do so. (5) The inability of females to survive long hibernation periods at low temperatures may be an important reason for the absence of this subspecies from colder regions.


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