Trillions of Insects Constitute Largest Migration in the World, Bugs Dwarf Bird Migrations
Where do insects go in winter?
Although flying insects constitute one of the largest populations on the planet, no comprehensive quantitative study has been undertaken until now examining the phenomenon of insect migration. Researchers assumed that many insect populations migrate, but did not know which insects do so, when, what the scope of migration is, and so forth.
The findings clearly showed a southward movement of these insect populations in fall and a northward movement in spring. The researchers were surprised by the scale of this phenomenon: some 3.5 trillion insects, creating a biomass of 3,200 tons, migrated in each season.
Also surprisingly, the data also showed that insects use the wind in order to reach their destination, choosing to “hitch a ride” on specific wind flows. The insects exploited the southerly winds in spring and the northerly winds in the fall. “They actually chose the direction they wanted to go in. We were surprised to find that insects make conscious use of navigation capabilities in order to reach their destinations using these winds,” said Dr. Sapir. The larger insects even combined their natural flight speed with the wind in order to reach a speed of up to 58 kilometers per hour during the migration seasons.
The important ramifications of insect migration highlight a further finding by the researchers: The total biomass of insects varies from one year to another, with the difference sometimes being as great as 200 tons. They explain that more insects are born in warmer summers, and accordingly the quantity of migration is greater. Conversely, in cooler summers fewer insects are born, and accordingly the biomass is smaller. Global climactic changes mean that the climate around the world is getting warmer, and accordingly it can be assumed with a large degree of certainty that the number of insects will increase significantly.
Source: http://www.ineffableisland.com/2017/01/trillions-of-insects-constitute-largest.html
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