From the fear of caterpillars eat less and grow faster


13/07/2012

To keep out predators on the eyes, hawk tobacco caterpillars have to eat less, but they are restructuring their metabolism so that they begin to make better use of even one small ration, which they manage to get one.

In the presence of a predator of its potential prey becomes skittish and cautious. Because of the fear of being eaten, it starts to hide, less engaged in search of food. That is, following the logic, we can conclude that fear causes the caterpillars to eat less, and therefore slower to develop and grow. However, experiments with caterpillars tobacco hawk suggest that in this case common sense is mistaken.

Experts from Cornell University put several tracks of different ages in a cage, fed them, and then sits down bugs. Bedbugs kill caterpillars sharp proboscis, so for the safety of the participants of the experiment deadly proboscis bugs previously removed. As a result of "dialogue" with bugs caterpillars have cut their rations by 40%. But at the same time intimidate caterpillar, oddly enough, the weight gained as well as those who have lived without any threats and fears, and developed at all quickly. It was found that due to such stress metabolism caterpillars rearranged so that they begin to effectively use with food derived nitrogenous compound. In addition, they cease to accumulate carbohydrates and lipids give preference.

Scientists note that this optimization does not pass metabolism in vain: after nine days intimidate caterpillars started to eat more than others, and the efficiency of assimilation derived from food nutrients they decreased by 35% below normal. Obviously, increasing the efficiency of digestion mechanism with time off as a result of an insect to maintain normal growth and development have to eat more.

It should be noted that scientists have long been familiar with the phenomenon of accelerated development of organisms during stress. In the same way they behave tadpoles, a water body increases the level of threat from predators. Tadpoles tend to quickly turn into a frog to leave a dangerous place. However, for the rapid development they have to pay for its size: the accelerated development of frogs obtained smaller than those that developed in calm conditions with no force majeure.

According to the materials Sciencemagis.ru


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