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Category: Biology

The strange influence the sun has on whales

The strange influence the sun has on whales

Ed Yong writes: The first clear evidence that some animals have a magnetic sense came from a simple-enough experiment—put an animal in a box, change the magnetic fields around it, and see where it heads. German scientists first tried this in the 1960s, with captive robins. When it came time to migrate, the birds would hop in a particular direction, as if they innately knew the way to fly. But when the team altered the magnetic fields around the robins’…

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How trees find their form

How trees find their form

By Rachel Ehrenberg, January 31, 2020 There’s a place in West Virginia where trees grow upside-down. Branches sprout from their trunks in the ordinary fashion, but then they do an about-face, curving toward the soil. On a chilly December day, the confused trees’ bare branches bob and weave in the breeze like slender snakes straining to touch the ground. “It’s really kind of mind-boggling,” says plant molecular biologist Chris Dardick, waving toward the bizarro plum trees. “They’re completely messed up.”…

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How do bats live with so many viruses?

How do bats live with so many viruses?

James Gorman writes: If previous outbreaks of coronavirus are any indication, the Wuhan strain that is now spreading may eventually be traced back to bats. Dr. Peter Daszak, president of EcoHealth Alliance, who has been working in China for 15 years studying diseases that jump from animals to people, said, “We don’t know the source yet, but there’s pretty strong evidence that this is a bat origin coronavirus.” He said, “It’s probably going to be the Chinese horseshoe bat,” a…

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A universal law may govern all living beings

A universal law may govern all living beings

Michel Loreau writes: The diversity of life is awe-inspiring. However, while biologists tend to focus on the multitude of species and how they live, what unites them may at times be more interesting than what sets them apart. In the era of “big data” and its deluge of information, this diversity can now begin to be perceived as a whole, discerning universal properties common to all creatures large and small. It was already known that there exist simple mathematical laws…

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Ageing: How our ‘epigenetic clocks’ slow down as we get older

Ageing: How our ‘epigenetic clocks’ slow down as we get older

Monkey Business Images By Leonard Schalkwyk, University of Essex and Jonathan Mill, University of Exeter From the tap dancing 90-year-old to the 40-year-old who struggles to run a mile, we all know people who seem surprisingly young or old for their age. Scientists believe that it may be possible to distinguish between two types of age: biological age, a measure of how well the body functions, and chronological age, your age in years. Epigenetics, the science of how environmental factors…

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In untold numbers, animals are suffering and dying, and we are either partly or wholly responsible

In untold numbers, animals are suffering and dying, and we are either partly or wholly responsible

Jeff Sebo writes: At the time of writing, Australia is on fire. The fires have killed at least 25 humans and more than a billion animals. Animals such as koalas are especially at risk, since their normal response to threats – climbing to the tops of trees – leaves them vulnerable in the case of fire. As a result, an estimated 25,000 koalas have died and many more will die in the coming weeks. In 2018, Hurricane Florence swept through…

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How viruses secretly control the planet

How viruses secretly control the planet

Nala Rogers writes: Viruses control their hosts like puppets — and in the process, they may play important roles in Earth’s climate. The hosts in this case aren’t people or animals: They are bacteria. A growing body of research is revealing how viruses manipulate what bacteria eat and how they guide the chemical reactions that sustain life. When those changes happen to a lot of bacteria, the cumulative effects could potentially shape the composition and behavior of Earth’s oceans, soil…

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New evidence suggests, the default condition in plants is immortality

New evidence suggests, the default condition in plants is immortality

Erin Malsbury writes: Long-lived humans having nothing on trees. Some, like the Ginkgo biloba, can live more than 3000 years. Now, in the most comprehensive plant aging study to date, researchers have revealed the molecular mechanisms that allow the ginkgo—and perhaps other trees—to survive so long. The new study provides the first real genetic evidence for something scientists have long suspected: “The default condition in plants is immortality,” says Howard Thomas, a plant biologist from Aberystwyth University who was not…

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Could invisible aliens really exist among us? An astrobiologist explains

Could invisible aliens really exist among us? An astrobiologist explains

They probably won’t look anything like this. Martina Badini/Shutterstock By Samantha Rolfe, University of Hertfordshire Life is pretty easy to recognise. It moves, it grows, it eats, it excretes, it reproduces. Simple. In biology, researchers often use the acronym “MRSGREN” to describe it. It stands for movement, respiration, sensitivity, growth, reproduction, excretion and nutrition. But Helen Sharman, Britain’s first astronaut and a chemist at Imperial College London, recently said that alien lifeforms that are impossible to spot may be living…

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The knowledge of trees

The knowledge of trees

Sue Burke writes: The U.N. Climate Change Conference in Madrid opened on Dec. 2 by calling the climate crisis a “war against nature.” But trees have always been at war, fighting for their survival. While plants may seem passive in the environment, they can sense their environments, make decisions, and respond to threats—up to a point. Every autumn holds terrible perils for plants. While many trees drop their leaves every year, the decision of precisely when to do so is…

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A new study shows an animal’s lifespan is written in the DNA. For humans, it’s 38 years

A new study shows an animal’s lifespan is written in the DNA. For humans, it’s 38 years

A genetic “clock” lets scientists estimate how long extinct creatures lived. Wooly mammoths could expect around 60 years. Australian Museum By Benjamin Mayne, CSIRO Humans have a “natural” lifespan of around 38 years, according to a new method we have developed for estimating the lifespans of different species by analysing their DNA. Extrapolating from genetic studies of species with known lifespans, we found that the extinct woolly mammoth probably lived around 60 years and bowhead whales can expect to enjoy…

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Light pollution is key ‘bringer of insect apocalypse’

Light pollution is key ‘bringer of insect apocalypse’

The Guardian reports: Light pollution is a significant but overlooked driver of the rapid decline of insect populations, according to the most comprehensive review of the scientific evidence to date. Artificial light at night can affect every aspect of insects’ lives, the researchers said, from luring moths to their deaths around bulbs, to spotlighting insect prey for rats and toads, to obscuring the mating signals of fireflies. “We strongly believe artificial light at night – in combination with habitat loss,…

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A molecular connection between the brain and aging

A molecular connection between the brain and aging

Veronique Greenwood writes: A thousand seemingly insignificant things change as an organism ages. Beyond the obvious signs like graying hair and memory problems are myriad shifts both subtler and more consequential: Metabolic processes run less smoothly; neurons respond less swiftly; the replication of DNA grows faultier. But while bodies may seem to just gradually wear out, many researchers believe instead that aging is controlled at the cellular and biochemical level. They find evidence for this in the throng of biological…

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The scammy world of DNA test startups

The scammy world of DNA test startups

Futurism reports: In the spring of 2017, a college student named Mary spit into a tube and sent it to the DNA testing company Ancestry, which analyzed it and sent back a breakdown of her family history. But Mary wanted to know more. The human genome contains, in theory, an extraordinary wealth of pre-programmed information about who we are and who we might become: whether she was at risk for the same types of cancer that killed her parents, for…

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Genes from bacteria helped plants move to land

Genes from bacteria helped plants move to land

Carl Zimmer writes: If you’ve ever noticed a slimy film of algae on a rock, chances are you didn’t pay it much attention. But some of these overlooked species hold clues to one of the greatest mysteries of evolution, scientists have found: how plants arrived on land. On Thursday, researchers published the genomes of two algae that are among the closest known living relatives of land plants. They already had some of the key genes that plants would need to…

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The elephant-human relationship dates back into prehistory

The elephant-human relationship dates back into prehistory

Tim Flannery writes: In January 1962, on my sixth birthday, I was taken to Melbourne Zoo, where I rode an elephant. We children climbed a scaffold and perched on rough wooden benches atop the elephant’s back, where my fingers furtively reached for a feel of its wrinkled skin. A few months later, elephant rides were discontinued, for safety reasons, at most zoos in Australia, Europe, and the US. I was dimly aware of the danger involved in mounting such an…

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