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Photo: Sarita Santoshini
Photo: Sarita Santoshini

Earth may be home to 1 trillion species, say scientists

As many as 99.999% of species in the world remain undiscovered, according to study analysing microbial data

Washington: Nearly 1 trillion species could be living on Earth, yet 99.999% remain undiscovered, according to the largest-ever analysis of microbial data.

Researchers combined microbial, plant and animal community data sets from government, academic and citizen science sources, resulting in the largest compilation of its kind. The data represent over 5.6 million microscopic and non-microscopic species from 35,000 locations across the world’s oceans and continents, except Antarctica.

“Estimating the number of species on Earth is among the great challenges in biology," said Kenneth J. Locey, a postdoctoral fellow at Indiana University in the US. “Our study combines the largest available data sets 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."

“Until recently, we’ve lacked the tools to truly estimate the number of microbial species in the natural environment," he said.

“Many earlier attempts to estimate the number of species on Earth simply ignored microorganisms or were informed by older data sets that were based on biased techniques or questionable extrapolations," said Jay T. Lennon, associate professor at the IU Bloomington College of Arts and Sciences’ Department of Biology.

“Until now, we haven’t known whether aspects of biodiversity scale with something as simple as the abundance of organisms," Locey added. “As it turns out, the relationships are not only simple but powerful, resulting in the estimate of upwards of one trillion species."

The results also suggest that identifying every microbial species on Earth is an almost unimaginably huge challenge. The Earth Microbiome Project—a global multidisciplinary project to identify microscope organisms—has so far catalogued less than 10 million species.

“Of those catalogued species, only about 10,000 have ever been grown in a lab, and fewer than 100,000 have classified sequences," Lennon said. “Our results show that this leaves 100,000 times more microorganisms awaiting discovery—and 100 million to be fully explored. Microbial biodiversity, it appears, is greater than ever imagined."

The research was published in the journal Proceedings of the National Academy of Sciences, or PNAS.

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