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CLIMATEWIRE | Hordes of giant viruses are living on the world’s second-largest body of ice — and may be slowing the impacts of climate change.

Scientists announced the discovery in a recent paper on the Greenland ice sheet. Some of the viruses, they say, have infected algae, potentially limiting the growth of colored snow blooms that can speed up ice melt and raise global sea levels.

“They infect the microalgae,” said Laura Perini, one of the paper’s lead authors and a researcher at Denmark’s Aarhus University. “If they kill the algae, … then they kind of reduce the speed with which the ice is melting.”

The Greenland ice sheet is the largest single contributor to global sea level rise. Algae can darken the surface of the snow, causing it to absorb more sunlight and melt at faster rates.

Researchers suspect that the newly discovered viruses help control that algal growth.

That theory isn’t yet confirmed — and scientists aren’t sure exactly how much algae contributes to melting on the Greenland ice sheet. But algal blooms are growing larger as the planet warms, Perini said, making it important to investigate the factors that affect their growth.

Since being classified in the 1980s, scientists have found giant viruses — or nucleocytoplasmic large DNA viruses — all over the world in soil, rivers, and oceans. Perini and her team wanted to find out if they also inhabited icy Greenland.

Researchers conducted genetic analyses on samples taken from the ice sheet. They found viral genes hiding in algal cells, indicating that the viruses have been infecting the algae populations for a while — likely hundreds of years.

Those pathogens are likely killing algae cells and obstructing the growth of blooms, though that was not investigated in the paper, said Frederik Schulz, a microbiologist at Lawrence Berkeley National Laboratory and one of the world’s top giant virus researchers.

“We have some examples that are reasonably well studied” of marine algal blooms, Schulz said in an interview. “Giant viruses play a role there in terminating the algae.”

If the viruses are keeping the algae population in check on the Greenland ice sheet, he said, that would mean they are allaying climate-driven global sea-level rise.

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While people don’t eat houseplants and rarely munch on shrubs or ground cover, your pets probably do. That’s why you need to be really, really sure your pet won’t try to snack on your plants before installing a plant that might be toxic—and it turns out that a lot of plants are.

While people don’t eat houseplants and rarely munch on shrubs or ground cover, your pets probably do. That’s why you need to be really, really sure your pet won’t try to snack on your plants before installing a plant that might be toxic—and it turns out that a lot of plants are.

Toxic vs. poisonous

Not all plants are toxic to pets; some are merely poisonous—and yes, there’s a difference. Toxic plants can do harm in all kinds of ways—through surface contact or inhalation. Just being around them can be bad for your pet, even if they’re not likely to chew. Poisonous plants, on the other hand, have to be ingested to be dangerous, so they are mildly less problematic. That said, some plants are poisonous enough that they only need to be consumed once to have dire consequences, so you’d need to really trust that your pet is isolated from the plant or would never look at, for example, a hydrangea branch as a chew toy. Dan Teich, DVM, who runs District Veterinary Hospitals in Washington, DC, notes, “The good news is most plants will not cause permanent damage to your pet. Many are irritants, can cause excessive salivation, and upset stomach, but usually these signs will pass. This is common with philodendrons, poinsettias, pothos, and many common houseplants.”

Avoid these common plants

Teich notes that the most common plant-related incidents they see involve a commonly gifted flower. “True lilies are the most dangerous of all plants for cats; even the pollen can be deadly. Lilies can lead to irreversible kidney failure in a cat within days. Calla lilies and peace lilies are not true lilies and may cause intestinal upset in your pet.” He warns that if you suspect lily ingestion, you should seek immediate care for your cat.

Other plants present similar risks, according to Teich. Consuming large amounts of azalea leaves can lead to cardiac collapse, and even death. Ingesting sago palms—a popular outdoor and indoor plant—can be fatal, and any consumption by a pet should be treated as an emergency.

Foxglove, an easily spread outdoor flower, is also dangerous. Like lily of the valley and oleander, it can have a grave effect on your pet’s heart.

If you are uncertain if a plant is dangerous to your pet, you may contact the ASPCA 24/7 Poison Control Hotline at 888-426-4435 or the Pet Poison Helpline at 855-764-7661.

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If you want to discover a hidden world of new life-forms, you don’t have to scour dark caves or slog through remote rainforests. Just look under your feet. When then-graduate student Anna Rosling went to northern Sweden to map the distribution of a particular root-loving fungus, she found something much more intriguing: Many of her root samples contained traces of DNA from unknown species. Weirder still, she never encountered a complete organism. When the field season ended, she had only isolated bits of raw genetic material. The fragments clearly belonged to the fungal kingdom, but they revealed little else. “I got obsessed,” recalls Rosling, now a professor of evolutionary biology at Uppsala University in Sweden.

Since then, mycologists have realized that such phantoms are everywhere. Point to a patch of dirt, a body of water, even the air you’re breathing, and odds are that it is teeming with mushrooms, molds and yeasts (or their spores) that no one has ever seen. In ocean trenches, Tibetan glaciers and all habitats between, researchers are routinely detecting DNA from obscure fungi. By sequencing the snippets, they can tell they’re dealing with new species, thousands of them, that are genetically distinct from any known to science. They just can’t match that DNA to tangible organisms growing out in the world.

These slippery beings are so widespread that scientists are calling them “dark fungi.” It’s a comparison to the equally elusive dark matter and dark energy that make up 95 percent of our universe and exert tremendous influence on, well, everything. Like those invisible entities, dark fungi are hidden movers and shakers. Scientists are convinced they perform the same vital functions as known fungi, directing the flow of energy through ecosystems as they break down organic matter and recycle nutrients. Dark fungi are prime examples of what biologist E. O. Wilson called “the little things that run the world.” But their cryptic lifestyle has made it a maddening challenge for scientists trying to show how exactly they run it.

Taxonomists have described just 150,000 of the millions of fungi predicted by global biodiversity estimates, and recent discoveries suggest a huge portion of what’s left may be off-limits to routine biological investigation. “We have not even started to scratch the surface,” says Henrik Nilsson, a mycologist at the University of Gothenburg in Sweden. “I’d be willing to bet that the clear majority will be dark.” Given the central place of fungi in the web of life that sustains us, experts argue we should get a better grasp on them.

Everything we know about dark fungi comes from environmental DNA, or eDNA. That term refers to strings of base pairs—the building blocks of DNA that are constantly sloughing off all living things. Researchers can analyze these free-floating bits of double helix to determine which species have been hanging around an area without seeing them. To identify fungi specifically, scientists look to a handy genetic marker called the internal transcribed spacer (ITS), which consists of several hundred base pairs that evolve quickly and thus help distinguish between species. Although the ITS is only a tiny fraction of the genome, researchers can single it out and amplify it with the same polymerase chain reaction technology used in COVID lab tests. If an ITS sequence is different enough from all others in genetic databases, it is thought to represent a new species, whether scientists lay eyes on its physical form or not.

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In a new preprint paper—which, for context, is not peer reviewed, and is more of an editorial or set of observations than a theory or study—mathematician Kevin Buzzard is grappling with a simple idea from coding that becomes a “thornier concept” when translated into math: what does the equal sign actually mean? And what does it not mean?

Buzzard has been in the news for his efforts to turn classic math proofs into code that can be verified by a computer, including Fermat’s Last Theorem. For him, as a classically trained mathematician, the world of computer code includes some surprises.

“Six years ago, I thought I understood mathematical equality,” Buzzard wrote in his paper. “I thought that it was one well-defined term, and that there was nothing which could be said about it which was of any interest to me as a working mathematician with a knowledge of, but no real interest in, the foundations of my subject. Then I started to try and do masters level mathematics in a computer theorem prover, and I discovered that equality was a rather thornier concept than I had appreciated.”

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