The researchers measured the oxygen levels in and around the net air bubbles that cover the head of animals that live in water. They found that the bubble function like gills, filtering water and removing oxygen from carbon dioxide.
Spiders that live in Europe and northern Asia is a web with fine hair from his belly. To find out how many times the spider takes in air, an invertebrate expert, Prof Roger Seymour and Dr Stefan Hetz, collected samples of spiders from the River Eider, Germany. They built artificial habitats of spiders in the laboratory.
It turned out that by measuring differences in levels of oxygen in the bubbles and the water environment, researchers have gills gas exchange as well as in animals that breathe in water.
"When the spider breathe oxygen in the bubble, oxygen levels decrease and oxygen from water into the bubble," said Seymour, as quoted by the BBC.
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