Showing posts with label mosquito. Show all posts
Showing posts with label mosquito. Show all posts

Asian Tiger Mosquitoes Moving To the Australian Mainland

With climate change insects move geographically. New regions open up to be populated. Warming of the Australian mainland has taken place. The Asian tiger mosquito has been found on Thursday and Horn islands in the Torres strait close to Australia itself.

Dengue and chicungunya are the greatest dangers. These diseases can be fatal. There is no way the mosquitoes can be stopped. They will move into Australia proper. Spraying insecticides will only slow them down. They won't fly to Australia. They will be brought here on small boats moving all over the Torres Strait.

The threat is serious. Once established in Australia Asian tiger mosquitoes will be spread by humans as far south as Tasmania. They prefer a cooler climate than the main dengue host, Aedes aegypti. Tigers will carry dengue, however.

The outside-life of Australians is under threat. Having a barbecue will be a dangerous pastime. Recently it has been established that mosquitoes are not native to Papua New Guinea. They came from Indonesia, so migration is normal for the insect.
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     Australian Blog                         
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Mosquitoes Fly on After Being Hit by Raindrops

Mosquitoes are extremely robust. They can survive being hit by raindrops 50 times their size. The insect is knocked down a little by the raindrop travelling at 300 times normal gravity, but it recovers and flies on.

This attribute was discovered by videoing insects actually being hit by raindrops from artificial rain. There was no improvement in stopping the spread of malaria. Better ways of designing tiny flying robots was enhanced, however, because rain tends to knock mechanical drones off course. Even aeroplanes are detrimentally affected by rain.

The raindrops on mosquitoes tests were exciting to watch. As the rain hit them they dropped, then recovered and sheltered on the wall of the test area. They fell an average of 13 body lengths. Nearly all hits were glancing blows which made mosquitoes roll, pitch and yaw. A direct hit led to a fall of 20 body lengths.

The theory is that mosquitoes are so small the speed of raindrops falling to earth is not affected, This means little energy is transferred to mosquitoes by collisions.
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