Insect Submariners Defy Depths Without Imploding
Researchers have discovered that lake fly larvae in Lake Malawi use specialized air sacs to survive high-pressure environments at depths of over 200 meters. This finding challenges the long-standing biological theory that insects are absent from the deep ocean due to respiratory system collapse.
Why it matters
This discovery provides new insights into insect physiology and could inspire the development of pH-powered smart materials or artificial muscles.
Deep-diving insect larvae are challenging a long-held idea about why there are no insects in the ocean, thanks to sturdy air sacs.
In Lake Malawi in East Africa, billions of lake fly larvae (Chaoborus edulis), make an unusual commute: By day, they sink more than 200 metres into the lake's oxygen-starved "dead zone" to hide from predators. By night, they rise to safely feed - but not before passing through a horde of waiting fish.
UBC researchers Drs. Philip Matthews and Evan McKenzie deployed a sonar system at the bottom of the lake to map these daily dives.
Dissecting the larvae, the team found they had turned part of their respiratory system into two pairs of tiny air sacs that function like ballast tanks to control their buoyancy.
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