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WORLDWIDE: Ants! It turns out there are 20 quadrillion of them on Earth — or 2.5 million per human

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#AceNewsDesk – The world’s human population is forecast to surpass 8 billion in the coming months. But we’ve got nothing on ants.

One of the ants up close
The researchers based their analysis on 489 studies of ant populations spanning every continent where ants live.(ABC News: Brendan Esposito)none

Researchers have made the most thorough assessment to date of the global population of ants — insects that have colonised almost everywhere on the planet — and the estimated total is a mind-blowing 20 quadrillion of them, or approximately 2.5 million for every human.

It should come as little surprise considering how ubiquitous these busy and social insects are.

They have thrived since the age of dinosaurs, with the oldest-known ant fossil dating back about 100 million years to the Cretaceous Period.

“Ants certainly play a very central role in almost every terrestrial ecosystem,” said entomologist Patrick Schultheiss of Germany’s University of Würzburg and the University of Hong Kong, co-lead author of the study published in the journal Proceedings of the National Academy of Sciences.

“They are very important for nutrient cycling, decomposition processes, plant seed dispersal and the perturbation of soil.

“Ants are also an extremely diverse group of insects, with the different species fulfilling a wide range of functions.

“But most of all, it is their high abundance that makes them key ecological players.”

There are more than 12,000 known species of ants, which generally are black, brown or red in colour and possess bodies segmented into three parts.

Ranging in size from about 1 millimetre to 3 centimetres long, ants typically inhabit soil, leaf litter or decaying plants — and occasionally our kitchens.Ants generally live in colonies, sometimes consisting of millions of them divided into groups.(Supplied: David Hu)none

Ants, whose closest relatives are bees and wasps, are native to nearly everywhere on Earth, as any picnicker knows, except Antarctica, Greenland, Iceland and some island nations.

“I was amazed that the ants’ biomass was higher than that of wild mammals and birds combined, and that it reaches 20 per cent of the human biomass,” said insect ecologist and study co-lead author Sabine Nooten, also of the University of Würzburg and University of Hong Kong.

“That gives you an understanding of the scale of their impact.

“I find the enormous diversity of ants fascinating.

“They can be tiny or huge and show the most bizarre adaptations,” she added, citing a widespread ant genus called Strumigenys, known for long mouth parts with spikes used to hunt small invertebrates.

The researchers based their analysis on 489 studies of ant populations spanning every continent where ants live.

“Our dataset represents a massive collecting effort of thousands of scientists,” Dr Schultheiss said.

“We were then able to extrapolate the number of ants for different regions of the world and estimate their total global number and biomass.”Australia has a crazy ant problem

‘Most ants are actually highly beneficial’

Tropical regions were found to harbour many more ants than other regions, with forests and drylands boasting more ants than urban areas.

“There are certain parts of the world where we have little data and we cannot reach reliable estimates for all continents. Africa is one such example. We have long known that it is a very ant-rich continent, but also very under-studied,” Dr Schultheiss said.

Ants generally live in colonies, sometimes consisting of millions of them divided into groups with different roles such as workers, soldiers, and queens.

The workers, all females, care for the bigger queen and her offspring, maintain the nest, and forage for food.

Males mate with queens, then die.

“Some ants can certainly be very annoying, but that’s a very human-centered perspective,” Dr Schultheiss said.

“Most ants are actually highly beneficial, even to us humans.

“Think about the amount of organic matter that 20 quadrillion ants transport, remove, recycle and eat.

“In fact, ants are so essential for the smooth working of biological processes that they can be seen as ecosystem engineers.

“The late ant scientist EO Wilson once called them ‘the little things that run the world.'”

Dr Chris Burwell, a senior curator of insects from Queensland Museum, said the study emphasised the integral role ants play in our ecosystems.

“Having that estimate of the numbers; I know ants are important, but they are really important given the sheer number of them,” said Dr Burwell, who was not involved with the study.

“It’s not each ant as the individual, but the colony we regard as the individual. Colonies are the equivalent of an animal or a mammal in the ecosystem.

“There have been studies done where they estimate the ants walking around on the surface, and it’s a fraction of the ants living in the colony — so you’re seeing a small amount of the ants that are out there.

“That estimation compared to humans, it tells you there’s a lot of ants, but also shows you there are a lot of humans.”Think about the amount of organic matter that 20 quadrillion ants process.(Adobe Stock)none


#AceNewsDesk report ………..Published: Sept.22: 2022:

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