A new study estimates there are 20 quadrillion individual ants across the globe, which together weigh more than all wild birds and mammals combined
To provide an answer, they compiled data from 489 studies that measured ant densities in different parts of the world using standardised methods. They extrapolated this data to estimate there are approximately 20,000,000,000,000,000, or 20 quadrillion, ants across the globe.The total biomass of this global ant population – the collective weight of carbon in all the individuals – is about 12 million tonnes.
Previous estimates of the number of ants on Earth were “essentially educated guesses” that extrapolated from ant densities measured in one or two locations, says Schultheiss. The latest analysis aimed to be more accurate by looking at studies from all continents and written in different languages.There are still gaps in our knowledge, however, because most ant counts have been conducted on the ground, rather than in trees or underground, says Schultheiss.
There are 15,700 known species and subspecies of ants. The insects are vital to most ecosystems because of their roles in dispersing seeds, increasing nutrient availability via soil turnover and providing food for ant-eating animals.“With this study, we provide a baseline for the global distribution of the number of ants and the biomass, and in the future we could do repeat studies in the same places using the same methods to see what has changed,” she says.
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