The Mediterranean aphids, by contrast, are viviparous in all generations. The latest annual cycle autumn females do not lay eggs. To overcome the winter, after going through the four stages and the five nymphal molts its exoskeleton and maturity, just hide and go into hibernation.
The curious life of the Mediterranean Aphis nerii begins in spring when adult aphids recent previous cycle wake of winter dormancy, after spending the harsh cold months in hibernation under leaves and crevices of the bark of the oleanders. Then the autumn survivors aphids rise to new outbreaks of oleander spring and feed on the juicy and nutritious sap of parasitized plant and a few days, and good fat, they give birth to small female aphids genetically identical to their mother , ie clones with the same genome, which, after passing through four nymphal stages and five changes, reach maturity.
The aphids of second generation, all wingless, ie without wings surround their mother forming a colony and are getting fat and shedding its cuticle as they grow. At maturity, like their mother, they give birth to living daughters parthenogenetically, most wingless and winged a few, depending on the saturation of the colony of aphids. Individuals winged parthenogenetic females and apterous specimens, looking fly without parasitize shoots of the same plant or nearby plants and form new colonies, which, when they reach maximum saturation capacity of individuals, generate a more or lower number of winged females that leave the colony in search of new territories. So are happening generations of aphids during the warmer months of spring, summer and early fall Mediterranean.
When it starts to cool, about mid autumn, oleander aphids know they can not survive the cold still active or awake and art becomes hibernating. Thus, entering winter dormancy, paralyze their metabolism, sleep and wait. When at last the first rays of spring temperature increase, the body's lymph overwintering aphids warms, their metabolism is reactivated and awaken again to the adventure of a lifetime. Survival of the species depends on the few adult aphids that have survived the long and treacherous Mediterranean winter and the many predators, especially insectivorous birds, who have eagerly sought under the leaves to feed on them.
And now comes a question: should the Mediterranean subspecies of a Japanese female who for many years managed to leave the Japanese archipelago, perhaps in a bonsai as a gift sent by the Emperor of Japan to Emperor of ancient Persia and, finding no male, had to resort to the strategy of parthenogenesis to reproduce asexually even in the autumn generation, filling clonic daughters of the beautiful oleanders Hanging Gardens of Babylon?. Hence reaching the Mediterranean coast could be just a matter of a couple of centuries. This would explain why the same species, in the autumn generation in Japan reproduces sexually with males and females, while in the Mediterranean only parthenogenetic females throughout the annual cycle.