Home LATEST NEWS World is home to at least 20 trillion ants, study finds

World is home to at least 20 trillion ants, study finds

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Determining how many ants inhabit the globe is important in order to be able to measure the consequences that changes to their habitat – including climate change – can have.

A significant role

Ants play a significant role wherever they are present, serving both as a means of dispersal for plant seeds, as hosts for certain organisms and as predators or prey for other animals.

Some studies had already attempted a count based on an estimate of the overall insect population and had resulted in a much lower number of ants.

Solenopsis richteri on a leaf.

Solenopsis richteri on a leaf.

Photo: Australian National Insect Collection/Ken Childs

For this new attempt, published Monday in the scientific journal Proceedings of the National Academy of Sciences (PNAS)the researchers analyzed the results of 465 studies that had measured the number of ants locally, in the field.

These hundreds of studies have used two standardized techniques: the setting of traps capturing individuals passing by for a certain period of time, or the analysis of the number of ants present on a given plot of foliage on the ground.

The total biomass of ants on Earth (measured in dry matter) is thus estimated at 12 million tonnes. This is more than the biomass of wild birds and mammals combined, and it is 20% of that of humans.

While surveys have been carried out on all continents, some major regions presented very little or no data, particularly in Central Africa or Central Asia.

That is why the true abundance of ants is probably considerably higherwarns the study. It is of the utmost importance that these gaps are filled, in order to provide a complete picture.

Nylanderia fulva ants eat a spider.

Nylanderia fulva ants eat a spider.

Photo: Mark Sanders.

There are more than 15,700 species or subspecies of ants, and probably as many not yet described, according to the study. Amazingly, they are present everywhere on the planet.

But nearly two-thirds of ants are found in just two types of ecosystems: forests and tropical savannahs, the work concludes.

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In the future, the researchers plan to study the environmental factors influencing the density of ant populations.

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