Biologists from the Moscow state University have studied how the reduction of insects in the course of evolution affects the size of their internal and external organs. It turned out that this retains the proportions of the latter, although the nervous system increases. About it reported in a press release received by "the Ribbon.ru" on Wednesday, may 17.
The scientists focused their attention on the process of miniaturization — the reduction of the body of arthropods to the lowest possible size. This is one of the main directions of the evolution of insects, in which they become comparable with microscopic organisms. However, previously it was not clear what adjustment while undergoing their internal organs.
Biologists have constructed a 30 complete and 26 partial three-dimensional computer reconstructions of the body 22 species of insects from 11 families belonging to five orders (Seinajoki, senedy, thrips, Coleoptera and Hymenoptera). The volumes of the bodies of the small and large arthropods differed by more than 150 thousand times.
Experts have shown that the majority of organ systems in insects are able to scale and maintain the aspect ratio with repeated changes of body size. "Organ systems maintain organization, and some even the same relative amount, despite repeated size reduction", — said Alexey Polilov, one of the authors of the study.
It was found that the sexual and the nervous system in the reduction of body size increase in several times. According to scientists, they limit the minimum size.