The solitude of Leonardo da Vinci : First Part And if you are alone you will completely belong to yourself (Leonardo da Vinci) Everybody knows Leonardo da Vinci. “La Gioconda” is, maybe, the most famous and admired picture of all time. Even the innumerable machines of the Italian genius are well-known. It isn’t so easy to suppose how many publications and studies about Leonardo da Vinci may be found. And yet, in my opinion, I think Leonardo hasn’t really been known in the deepness of his thought.
Overpopulation: mechanism at negative retroaction 4/4 Even more interesting is the epidemic of FELV, the feline leukaemia which affected 17% of street cats in Rome.
Overpopulation: mechanism at negative retroaction 3/4 The latter example explains what happens when a population comes into contact with a new virus and the system or predator-prey, parasite – host sets haven’t yet developed homeostasis. Before getting to balance, mortality may be very high, so that, if a population that had already been in contact with the virus, is present in the ecosystem, the species that comes into contact with it, for the fitst time, may completely disappear.
Overpopulation: mechanism at negative retroaction 2/4 Now let’s try to understand better the functioning of the mechanism at negative retroaction. For this we’ll make use of two examples: a natural one and another in which human intervention is basic. In the first case the number of many rodents, Lemmings among them, increases up to a certain point beyond which an epidemic of some kind that kills almost the whole population, occurs. The increase starts again and is followed by another epidemic and so on[1], [2].
Overpopulation: mechanism at negative retroaction 1/4 Animals and ecosystem: Validity of the laws of nature. “Every action made by nature cannot be done in a shorter way with the same means” (Leonardo Da Vinci[1] Let’s imagine a huge and perfect machine the gears of which are all in connection among them, the movement of the smallest of them influences all the others. It happens similarly in nature where all living beings, but also elements (air, water, land, rains, gas….) are linked one another through relations of interaction the study of which was defined with the word ecology.
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