Japanese giant hornet ( Vespa mandarinia japonica ) is a subspecies of the world's largest hornet, Asian giant hornet ( V. Mandarinia ). It is a large insect, with an adult that often grows up to more than 4.5 cm (1.8 inches), with a wingspan of more than 6 cm (2.4 inches). It has a large yellow head with large eyes, and a dark brown chest with a brown and yellow abdomen. The Japanese giant hornet has three small and simple eyes on the top of the head between two large compound eyes. As the name suggests, this is endemic to the Japanese island, where it prefers rural areas where it can find trees to nest. In Japanese it is known as ? Suzumebachi ( ??????? (???????) , literally "giant sparrow bee") .
The Japanese giant hornet is sometimes confused with yellow legged hornets (Vespa velutina), also known as Asian hornet, an invasive species that is of major concern throughout Europe, including the UK.
Video Japanese giant hornet
Description
Workers are looking for food to feed their relatives. Their diet consists of a variety of insects, including plant pests, and for this reason bees are considered beneficial. The workers cut their prey bodies to restore only the nutrient-rich body parts, such as flying muscles, to the nest. There, the workers chew the prey into pasta before feeding the larvae that produces the fluid consumed by the workers. This liquid is known as a mixture of amino acid vespa (VAAM). Synthetic VAAM is produced artificially as a dietary supplement, with the claim that it can improve athletic performance. In many mountain villages of Japan, the bees are considered delicious when fried.
Bee predation
In Japan, beekeepers often prefer European honey bees because they are more productive than Japanese honey bee that is endemic. However, it can be difficult to maintain a European honeycomb honey, because the giant bees destroy the honeycomb. After the Japanese giant bee has found a European honeycomb honey, it leaves a pheromone marker around it that quickly attracts friends to nest to gather in the nest. An individual bee can kill forty European honey bees one minute while a group of 30 bees can destroy an entire hive containing 30,000 bees in less than four hours. Bee bees kill and tear the bees, return to their nest with the thorax of the bees, which they feed into their larvae, leaving their heads and legs behind. Honey and bee bees are also taken to feed the bee larvae.
Unlike their European families, Japanese honey bees have a defense against bees. When the bees approach the nest to release pheromones, the bee workers will retreat back to the nest, leaving a gap to allow the trumpet scouts to enter. The bees then emerged from their hideout in an angry cloud formation containing about 500 individuals. They form a tight ball around the attacking hornet that acts like a convection oven with the bees vibrating their wings to generate heat through exertion and then directing the warm air around them into the center of the ball. This causes the interior temperature of the ball to rise to 47 Â ° C (117 Â ° F). In addition, the activity of the bees also increases the concentration of carbon dioxide in the sphere. The ability of the hornet to retain heat decreases with the increased concentration of carbon dioxide, which in turn causes the increase in temperature to be lethal.
Venom
The Japanese giant horn is large and can be very aggressive if provoked. The poison, which is injected by a 6.25 mm stinger, attacks the nervous system and damages its victim tissue. Tests involving rats found that the toxins were less than the most lethal of the wasp's poisons, having LD 50 of 4.0Ã, mg/kg. By comparison, the deadliest wasp poison (at least for laboratory mice) by weight belongs to Vespa luctuosa at 1.6Ã, mg/kg. The potential for shock is due, more precisely, to the amount of toxins injected in relatively large quantities. Stung is very painful and requires hospitalization. Asian giant fierce stings can cause anaphylactic shock in people who are allergic but can still be deadly for people who are not allergic, as long as the dose is enough. In China, where bees can also be found, conventional wisdom is that people sting more than 10 times need medical help, and emergency treatment if stung more than 30 times. Stings can also cause kidney failure. Thirty to forty people die in Japan every year after being stung by bees and wasps (including Japanese bees).
Maps Japanese giant hornet
References
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Source of the article : Wikipedia
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