Ants – with their wise farming practices and efficient navigation techniques – could inspire solutions for some human problems

November 20, 2022 / activist360

King Solomon may have gained some of his famed wisdom from an unlikely source – ants.

According to a Jewish legend, Solomon conversed with a clever ant queen that confronted his pride, making quite an impression on the Israelite king. In the biblical book of Proverbs (6:6-8), Solomon shares this advice with his son: “Look to the ant, thou sluggard, consider her ways and be wise. Which having no guide, overseer, or ruler, provideth her meat in the summer, and gathereth her food in the harvest.”

While I can’t claim any familial connection to King Solomon, despite sharing his name, I’ve long admired the wisdom of ants and have spent over 20 years studying their ecology, evolution and behaviors. While the notion that ants may offer lessons for humans has certainly been around for a while, there may be new wisdom to gain from what scientists have learned about their biology.

Ants have evolved highly complex social organizations.

Lessons from ant agriculture

As a researcher, I’m especially intrigued by fungus-growing ants, a group of 248 species that cultivate fungi as their main source of food. They include 79 species of leafcutter ants, which grow their fungal gardens with freshly cut leaves they carry into their enormous underground nests. I’ve excavated hundreds of leafcutter ant nests from Texas to Argentina as part of the scientific effort to understand how these ants coevolved with their fungal crops.

Much like human farmers, each species of fungus-growing ant is very particular about the type of crops they cultivate. Most varieties descend from a type of fungus that the ancestors of fungus-growing ants began growing some 55 million to 65 million years ago. Some of these fungi became domesticated and are now unable to survive on their own without their insect farmers, much like some human crops such as maize.

Ants started farming tens of millions of years before humans.

Ant farmers face many of the same challenges human farmers do, including the threat of pests. A parasite called Escovopsis can devastate ant gardens, causing the ants to starve. Likewise in human agriculture, pest outbreaks have contributed to disasters like the Irish Potato Famine, the 1970 corn blight and the current threat to bananas.

Since the 1950s, human agriculture has become industrialized and relies on monoculture, or growing large amounts of the same variety of crop in a single place. Yet monoculture makes crops more vulnerable to pests because it is easier to destroy an entire field of genetically identical plants than a more diverse one.

Industrial agriculture has looked to chemical pesticides as a partial solution, turning agricultural pest management into a billion-dollar industry. The trouble with this approach is that pests can evolve new ways to get around pesticides faster than researchers can develop more effective chemicals. It’s an arms race – and the pests have the upper hand.

Ants also grow their crops in monoculture and at a similar scale – after all, a leafcutter ant nest can be home to 5 million ants, all of which feed on the fungi in their underground gardens. They, too, use a pesticide to control Escovopsis and other pests.

Yet, their approach to pesticide use differs from humans’ in one important way. Ant pesticides are produced by bacteria they allow to grow in their nests, and in some cases even on their bodies. Keeping bacteria as a living culture allows the microbes to adapt in real time to evolutionary changes in the pests. In the arms race between pests and farmers, farming ants have discovered that live bacteria can serve as pharmaceutical factories that can keep up with ever-changing pests.

Whereas recent developments in agricultural pest management have focused on genetically engineering crop plants to produce their own pesticides, the lesson from 55 million years of ant agriculture is to leverage living microorganisms to make useful products. Researchers are currently experimenting with applying live bacteria to crop plants to determine if they are effective at producing pesticides that can evolve in real time along with pests.

Improving transportation

Ants can also offer practical lessons in the realm of transportation.

Ants are notoriously good at quickly locating food, whether it’s a dead insect on a forest floor or some crumbs in your kitchen. They do this by leaving a trail of pheromones – chemicals with a distinctive smell ants use to guide their nest mates to food. The shortest route to a destination will accumulate the most pheromone because more ants will have traveled back and forth along it in a given amount of time.

In the 1990s, computer scientists developed a class of algorithms modeled after ant behavior that are very effective at finding the shortest path between two or more locations. Like with real ants, the shortest route to a destination will accumulate the most virtual pheromone because more virtual ants will have traveled along it in a given amount of time. Engineers have used this simple but effective approach to design telecommunication networks and map delivery routes.

Not only are ants good at finding the shortest route from their nests to a source of food, thousands of ants are capable of traveling along these routes without causing traffic jams. I recently began collaborating with physicist Oscar Andrey Herrera-Sancho to study how leafcutter ants maintain such a steady flow along their foraging paths without the slowdowns typical of crowded human sidewalks and highways.

We are using cameras to track how each individual ant responds to artificial obstacles placed on their foraging trails. Our hope is that by getting a better understanding of the rules ants use to respond to both obstacles and the movement of other ants, we can develop algorithms that can eventually help program self-driving cars that never get stuck in traffic.

Look to the ant

To be fair, there are plenty of ways ants are far from perfect role models. After all, some ant species are known for indiscriminate killing, and others for enslaving babies.

But the fact is that ants remind us of ourselves – or the way we might like to imagine ourselves – in many ways. They live in complex societies with division of labor. They cooperate to raise their young. And they accomplish remarkable engineering feats – like building structures with air funnels that can house millions – all without blueprints or a leader. Did I mention their societies are run entirely by females?

There is still a lot to learn about ants. For example, researchers still don’t fully understand how an ant larva develops into either a queen – a female with wings that can live for 20 years and lay millions of eggs – or a worker – a wingless, often sterile female that lives for less than a year and performs all the other jobs in the colony. What’s more, scientists are constantly discovering new species – 167 new ant species were described in 2021 alone, bringing the total to more than 15,980.

By considering ants and their many fascinating ways, there’s plenty of wisdom to be gained.

These Scientists Are Making Antibacterial Bandages Out Of Fruit Waste

September 26, 2021 / activist360 / Leave a comment

By Travis Teo and Lee Ying Shan, World Economic Forum (Public License).

*The organo-hydrogel bandages are also able to keep wound areas cooler and moist, which can help accelerate healing. Image: Reuters/Lee Ying Shan*

Scientists at Nanyang Technological University in Singapore are transforming discarded durian husks into antibacterial gel bandages.
The process extracts cellulose powder from the fruit’s husks after they are sliced and freeze-dried.
The husks, which make up more than half of the composition of durians, are usually discarded and incinerated, contributing to environmental waste.

Scientists at Nanyang Technological University (NTU) in Singapore are tackling food waste by turning discarded durian husks into antibacterial gel bandages.

The process extracts cellulose powder from the fruit’s husks after they are sliced and freeze-dried, then mixes it with glycerol. This mixture becomes soft hydrogel, which is then cut into bandage strips.

“In Singapore, we consume about 12 million durians a year, so besides the flesh, we can’t do much about the husk and the seeds and this cause environmental pollution,” said Professor William Chen, director of the food science and technology programme at NTU. The fruit’s husks, which make up more than half of the composition of durians, are usually discarded and incinerated, contributing to environmental waste.

*Other food waste, such as soy beans and spent grains can also be turned into hydrogel. Image: Reuters/Lee Ying Shan*

Chen added that the technology can also turn other food waste, such as soy beans and spent grains, into hydrogel, helping limit the country’s food waste.

Compared to conventional bandages, the organo-hydrogel bandages are also able to keep wound areas cooler and moist, which can help accelerate healing.

The researchers say using waste materials and yeast for the antimicrobial bandages is more cost effective than the production of conventional bandages, whose antimicrobial properties come from more expensive metallic compounds like silver or copper ions.

A durian wholeseller, Tan Eng Chuan, said he goes through at least 30 crates of durians a day during durian season – as much as 1,800 kg. Being able to use the parts of the fruit that are ordinarily discarded, he said, was an innovation that would make enjoying it “more sustainable”.

When People Turn to Nature to Solve Human Problems, Sometimes Nature Benefits, Too

August 18, 2020 / activist360 / Leave a comment

Bioinspired solutions can be good not only for people, but also for the organisms offering the inspiration.

By Rachel Crowell, ensia (CC BY-ND 3.0)

Elephant photo by elCarito on Unsplash — *Photo by elCarito on Unsplash*

August 18, 2020 — African bush elephants can break through fences and destroy crops or large trees — including iconic and endangered ones. These missteps could be deadly to the elephants as people who see them as a dangerous nuisance demand they be killed.

However, a natural and non-lethal elephant deterrent exists: African honeybees. Elephants are scared by the sight, sound and even smell of the bees and their hives. Farmers and conservation organizations such as Save the Elephants have installed hives along key fence lines. But the bees’ food and water requirements can make the hives costly to maintain.

What if, wondered Mark Wright, an insect ecologist and integrated pest management expert at the University of Hawai’i at Mānoa, you could design something that would mimic the pheromones emitted by alarmed honeybees, thereby also deterring elephants? Wright is developing a blend of substances found in honeybee alarm pheromones that could produce that effect.

Wright says he’s still perfecting the mixture — which uses synthetic versions of the compounds rather than extracting them from bees — so it can evoke a “consistent and gentle” deterrence response. “You don’t want 50 elephants storming around and crashing into things,” he says. However, if the blend isn’t bothersome enough, the elephants won’t leave.

Innovators have been using nature as a role model for decades. Sometimes the invention just benefits people. But, as in the case of Wright’s bee-inspired elephant repellent, sometimes nature can benefit, too.

Possible Payback

So-called “bioinspired design” often starts with identifying plants or animals that excel in certain functions, says Marc Weissburg, co-director of the Georgia Institute of Technology’s Center for Biologically Inspired Design. For instance, pitcher plant rims are wildly slippery, earthworms’ bendy bodies make them top-notch burrowers, and tammar wallabies’ leg tendons are optimized to power their repeated hopping.

Next, researchers and designers investigate problems the observed capability might solve. This approach does not always include an aim to benefit nature, too. “People are just getting their minds wrapped around how to approach this from the standpoint of intentionally designing something, using biology, for a specific [human-benefiting] purpose,” Wright says.

In such instances, innovations can still end up indirectly helping the organisms that inspired them, however. Take Werewool. The startup is working on using proteins found in jellyfish, coral and other organisms to create fibers with certain properties (such as color, fluorescence or stretch) built into them, according to co-founder and CEO Chui-Lian Lee. Werewool researchers have created a prototype of a coral-inspired, dye-free fiber that’s naturally colorful and fluorescent.

Since the fibers aren’t yet available commercially, it’s too soon to measure their impact. However, Lee and her colleagues say they are designing their products with the goal of reducing fashion-related pollution, including the release of microplastics, harmful dyes and finishing products into waterways. That could ultimately lead full circle to reducing harm to coral and jellyfish.

Baked In

In the case of ECOncrete, the links between nature-inspired innovations and benefits for nature are baked in from the start. The company manufactures artificial tidepools, seawalls and other products inspired by structures found in the natural world. These products, which are used to provide structure in coastal, marine and urban environments, are designed to be hospitable to specific ocean organisms, says Shimrit Perkol-Finkel, a marine ecologist and co-founder and CEO of the company. The structures provide storm buffering and help limit coastal erosion, helping communities avoid or reduce flooding and other storm damage.

Perkol-Finkel says that ECOncrete’s proprietary concrete mixture makes structures stronger and more durable than those made from traditional concrete, which benefits humans. She says that the structures have complex surfaces with textures and other design elements that are made to mimic natural features that are hospitable to certain species for which natural habitat is shrinking. This complexity is also less hospitable to invasive species, enabling these structures to increase biodiversity while discouraging the presence of nuisance organisms.

“We design for the marine life,” Perkol-Finkel says. “That was the goal.”

Clear and Direct Benefits

At least one organization has found the perceived limited direct benefit to organisms to be a deterrent to focusing on nature-inspired design. San Diego Zoo Global (SDZG), a nonprofit that operates the San Diego Zoo and related facilities, once had its own center for bioinspiration. The center closed after SDZG pivoted its focus from being inspired by nature to benefiting nature directly.

Nevertheless, interest remains strong in using nature’s inspiration to create the innovations of tomorrow. And for at least some, those creations will also benefit nature in return.

Editor’s note: Rachel Crowell wrote this story as a participant in the Ensia Mentor Program. The mentor for the project was Hillary Rosner. In line with Ensia’s ethics statement, we disclose that Ensia editor in chief Mary Hoff in another capacity recently wrote a piece for AskNature about coral proteins. Rachel Crowell included both in this story with no input from Ensia staff, and the circumstance is purely coincidental.