Health
These microbes are known for the first time to be able to eat only viruses
New year, new viral diet — literally.
live in a small pond Harteria Ciliates are virus eaterscan survive on a virus-only diet, researchers report Dec. 27 Proceedings of the National Academy of SciencesUnicellular organisms are the first organisms known to thrive when viruses are the only ones on the menu.
Scientists already knew that microscopic organisms feed on aquatic viruses such as chloroviruses that infect and kill algae. But it’s unclear whether viruses alone can provide enough nutrients for organisms to grow and reproduce, says John DeLonge, an ecologist at the University of Nebraska-Lincoln.
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In laboratory experiments, Harteria DeLong and colleagues found that organisms that lived in water droplets and were fed only chlorovirus for survival thrived. As the number of viruses in the water decreased, Harteria The numbers have gone up. Ciliates that had no access to viral particles or other food did not grow.But Parameciumwhich is a larger microbe, did not thrive on a virus-only diet.
Viruses could be an excellent source of phosphorus, which is essential for making copies of genetic material, says DeLong. But it probably takes a lot of virus to give a complete dietary description.
In the laboratory, each Harteria The team estimates that the microbes ate about 10,000 to 1 million viruses each day. Harteria A small pond with an abundance of viral snacks could be eating about 1,000 trillion viruses per day.
These delicacies may shunt previously unrecognized energy into the food web, adding new layers in its path. viruses move carbon Through ecosystems—if it happened in nature, says DeLong (SN: 6/9/16). His team plans to begin investigating once the Nebraska pond thaws.
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