In the experiment, a group of dragonfly larvae and carnivorous fish were placed in the same aquarium. Even if the fish cannot eat dragonflies, some dragonflies are scared to death.
According to foreign media reports, insects may not have a developed brain, but this does not mean that they will not feel fear. Canadian biologists have studied dragonflies and found that they are very sensitive to the surrounding environment, and predators can scare them to death even if they appear in front of them, even if they are not in danger of being eaten. The research results were published in the latest issue of Ecology.
In the experiment, researchers at the University of Toronto in Canada put a group of dragonfly larvae (young dragonflies are aquatic animals) and carnivorous fish in the same aquarium, but the two groups are separated by a shield. Dragonflies can See the fish and smell the fish, but the fish cannot eat the dragonfly. Dragonfly larvae that saw fish were 2.5 to 4.3 times less likely to survive than those that did not. The leader of the study, Professor Locke Rowe, a biologist at the University of Toronto in Canada, said: "Our findings are surprising. Many dragonflies are scared to death when they see predators coming to them.
In the second experiment, the mortality rate of the dragonfly larvae exposed to fish transformed into its adult larvae reached 11%, while the mortality rate in the free environment was only 2%. Mr. Luo said: "Dragonfly larvae are transformed into adults, but we found that most of the dragonfly larvae exposed to fish cannot successfully complete the transformation, and often die during the transformation process." An important ecological topic. Through research, we have learned how these reactions affect the interaction between predators and prey. The response of animals under stress conditions is either due to the presence of predators or from natural or human activities , We gradually discovered that stress carries a greater risk of death. "
The researchers believe that the results of their research can be applied to any stress faced by all living organisms. The experiment can establish a model that will serve as a theoretical basis for future research on the "fatal effect of stress".
The reason why the researchers chose dragonflies as the research object is that dragonflies are larger than other insects. Some wingspans reach 16 cm, and even the smallest species have a wingspan of 2 cm. They are extremely agile flying animals and one of the fastest insects, and some can reach 40 miles (64 kilometers) per hour. The dragonfly is such an agile flying animal, but it is killed under pressure. It can be seen how harmful the pressure is. From a psychological point of view, stress is a cognitive and behavioral experience process composed of psychological stress sources and psychological stress responses. For humans, it is the response of the body's "preparation for war", which is the response when a certain situation, a person, or something is potentially threatening and tense. When this happens, the brain secretes hormones including epinephrine, which flows through the blood vessels to various parts of the body. When these hormones flow to the heart, lungs, and muscles, a special physiological reaction occurs: the heartbeat begins to speed up, breathing begins, the muscles are tense and ready to move, the vision becomes sharp, the stomach drums, and sweating begins , Disturbed, and nausea and vomiting in severe cases. Anxiety and anxiety remain in the body and continue to accumulate and rise with every encounter that causes tension, eventually leading to undesirable results.
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