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Category: Biology

A critically endangered bird is losing its song

A critically endangered bird is losing its song

Brisbane Times reports: When Michael Alfa was setting up to photograph wildlife at Woolgoolga’s sewage works near the northern NSW town of Coffs Harbour last year, the avid birdwatcher could hardly believe his senses. There, among the warbling wattlebirds hanging off a coastal banksia tree, was a lone, critically endangered regent honeyeater, distinctive in its yellow and black plumage. But not its birdsong. “It was making the exact same song [as the wattlebirds]. If you hadn’t seen it, you wouldn’t…

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Nature knows how to avoid network collapse

Nature knows how to avoid network collapse

Ruth DeFries writes: Sometime in the first billion years of the planet’s 4.5-billion-year history, a cell emerged in a primordial stew of chemicals brewing in liquid water. At that moment, the predictable chemistry and physics of the early Earth gave way to seething, roiling complexity. Primitive life thrived in the deep sea, where underwater volcanoes vented heat and spilled a cocktail of chemicals into seawater. Once life was underway, the course of the planet and the life it supported became…

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The link between bioelectricity and consciousness

The link between bioelectricity and consciousness

Tam Hunt writes: Life seems to be tied to bioelectricity at every level. The late electrophysiologist and surgeon Robert Becker spent decades researching the role of the body’s electric fields in development, wound healing, and limb regrowth. His 1985 book, The Body Electric: Electromagnetism and the Foundation of Life, was a fascinating deep dive into how the body is electric through and through—despite our inability to see or sense these fields with our unaided senses. But Becker’s work was far…

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What is life? Its vast diversity defies easy definition

What is life? Its vast diversity defies easy definition

Carl Zimmer writes: “It is commonly said,” the scientists Frances Westall and André Brack wrote in 2018, “that there are as many definitions of life as there are people trying to define it.” As an observer of science and of scientists, I find this behavior strange. It is as if astronomers kept coming up with new ways to define stars. I once asked Radu Popa, a microbiologist who started collecting definitions of life in the early 2000s, what he thought…

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Brood X cicadas are about to put on one of the wildest shows in nature. And D.C. is the main stage

Brood X cicadas are about to put on one of the wildest shows in nature. And D.C. is the main stage

The Washington Post reports: They’ve been buried — alive — for 17 years. And now, Brood X, one of the world’s largest swarms of giant fly-like bugs called cicadas, is ready to rise. When the ground warms to 64 degrees, they’ll stop gnawing on tree roots and start scratching toward the surface by the hundreds of billions. Georgia and other Southern states will probably be where they first emerge around the end of March, experts say. But residents of the…

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Martin Luther rewired your brain

Martin Luther rewired your brain

Joseph Henrich writes: Your brain has been altered, neurologically re-wired as you acquired a particular skill. This renovation has left you with a specialized area in your left ventral occipital temporal region, shifted facial recognition into your right hemisphere, reduced your inclination toward holistic visual processing, increased your verbal memory, and thickened your corpus callosum, which is the information highway that connects the left and right hemispheres of your brain. What accounts for these neurological and psychological changes? You are…

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Plant cells of different species can swap organelles

Plant cells of different species can swap organelles

Viviane Callier writes: More than a decade ago, plant geneticists noticed something peculiar when they looked at grafted plants. Where two plants grew together, the cells of each plant showed signs of having picked up substantial amounts of DNA from the other one. In itself, that wasn’t unprecedented, because horizontal transfers of genes are not uncommon in bacteria and even in animals, fungi and plants. But in this case, the transferred DNA seemed to be the entire intact genomes of…

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Insect populations suffering death by 1,000 cuts, say scientists

Insect populations suffering death by 1,000 cuts, say scientists

The Guardian reports: Insect populations are suffering “death by a thousand cuts”, with many falling at “frightening” rates that are “tearing apart the tapestry of life”, according to scientists behind a new volume of studies. The insects face multiple, overlapping threats including the destruction of wild habitats for farming, urbanisation, pesticides and light pollution. Population collapses have been recorded in places where human activities dominate, such as in Germany, but there is little data from outside Europe and North America…

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A newfound source of cellular order in the chemistry of life

A newfound source of cellular order in the chemistry of life

Viviane Callier writes: Imagine packing all the people in the world into the Great Salt Lake in Utah — all of us jammed shoulder to shoulder, yet also charging past one another at insanely high speeds. That gives you some idea of how densely crowded the 5 billion proteins in a typical cell are, said Anthony Hyman, a British cell biologist and a director of the Max Planck Institute of Molecular Cell Biology and Genetics in Dresden. Somehow in that…

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Whether slow or fast, here’s how your metabolism influences how many calories you burn each day

Whether slow or fast, here’s how your metabolism influences how many calories you burn each day

Why does it seem like some people can eat anything and not gain a pound while others are the opposite? Heide Benser/The Image Bank via Getty Images Terezie Tolar-Peterson, Mississippi State University It’s a common dieter’s lament: “Ugh, my metabolism is so slow, I’m never going to lose any weight.” When people talk about a fast or slow metabolism, what they’re really getting at is how many calories their body burns as they go about their day. The idea is…

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How the first life on Earth survived its biggest threat — water

How the first life on Earth survived its biggest threat — water

Michael Marshall writes: On 18 February next year, a NASA spacecraft will plummet through the Martian atmosphere, fire its retro-rockets to break its fall and then lower a six-wheeled rover named Perseverance to the surface. If all goes according to plan, the mission will land in Jezero Crater, a 45-kilometre-wide gash near the planet’s equator that might once have held a lake of liquid water. Among the throngs of earthlings cheering on Perseverance, John Sutherland will be paying particularly close…

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How ‘neutral theory’ altered ideas about biodiversity

How ‘neutral theory’ altered ideas about biodiversity

Christie Wilcox writes: If you had braved the jungles of China’s Fujian province in the early 20th century, various accounts say you could have witnessed a stunningly unexpected animal: a blue tiger. These tigers were described as “marvelously beautiful” with bodies “a deep shade of Maltese, changing into almost deep blue on the under parts.” As late as the 1950s, hunters reported spotting their blue hairs alongside the traditional orange fur of other South China tigers on trails. Then the…

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Is the Earth an evolving organism?

Is the Earth an evolving organism?

W Ford Doolittle writes: Many of us, scientists included, harbour contradictory intuitions about Mother Nature. We can see that ecosystems often have an inherent ability to self-stabilise, and we know we wouldn’t be here if the planet hadn’t maintained conditions suitable for life for almost 4 billion years. One reaction is to claim that some Earth-wide equilibrium, though fragile, does exist, and reflects the fact that species have evolved to cooperate with one another. Another is to say that the…

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Study reveals connection between gut bacteria and vitamin D levels

Study reveals connection between gut bacteria and vitamin D levels

UC San Diego Health: Our gut microbiomes — the many bacteria, viruses and other microbes living in our digestive tracts — play important roles in our health and risk for disease in ways that are only beginning to be recognized. University of California San Diego researchers and collaborators recently demonstrated in older men that the makeup of a person’s gut microbiome is linked to their levels of active vitamin D, a hormone important for bone health and immunity. The study,…

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Did viruses create the nucleus? The answer may be near

Did viruses create the nucleus? The answer may be near

Christie Wilcox writes: Different as the cells from animals, plants, fungi and protozoa can be, they all share one prominent feature: a nucleus. They have other organelles, too, like the energy-producing mitochondria, but the presence of a nucleus — a well-defined porous pouch full of genetic material — is what inspired the biologist Édouard Chatton in 1925 to coin the term eukaryotes, which referred to living things with a “true kernel.” All the rest he labeled prokaryotes, for life “before…

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Where is the dividing line between you and the world

Where is the dividing line between you and the world

Frédérique de Vignemont and Colin Klein write: Heini Hediger, a noted 20th-century Swiss biologist and zoo director, knew that animals ran away when they felt unsafe. But when he set about designing and building zoos himself, he realised he needed a more precise understanding of how animals behaved when put in proximity to one another. Hediger decided to investigate the flight response systematically, something that no one had done before. Hediger found that the space around an animal could be…

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