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Earth: Home to 1 Trillion Microbial Species

A new analysis of microbial data estimates that the world is home to 1 trillion species—of which only 0.001 percent have been discovered.

May 4, 2016
Catherine Offord

WIKIMEDIA, NASAResearchers at Indiana University have combined scaling laws with a model of biodiversity to produce a new estimate of the number of microbial species on Earth: somewhere between 1011 and 1012, or between 100 billion and 1 trillion. Given the current number of catalogued species stands at around 107, the researchers predict that around 99.999 percent of microbial species are left to discover. The findings were published on Monday (May 2) in PNAS.

“Estimating the number of species on Earth is among the great challenges in biology,” study coauthor Jay Lennon of Indiana said in a statement. “Our study combines the largest available datasets with ecological models and new ecological rules for how biodiversity relates to abundance. This gave us a new and rigorous estimate for the number of microbial species on Earth.”

The study compiled data from 20,376 surveys of bacteria, archaea, and microscopic fungi—plus 14,862 sampling efforts on tree, bird, and mammals communities—from 35,000 locations worldwide. After demonstrating that the abundance of the most dominant ocean bacterial species scales with the total number of individuals across 30 orders of magnitude, the researchers used these data to predict the existence of around one trillion microbial species worldwide.

Simon Malcomber, director of the National Science Foundation’s Dimensions of Biodiversity program, which helped fund the research, said that the study “offers a view of the extensive diversity of microbes on Earth” and “highlights how much of that diversity still remains to be discovered.”

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