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Category: Ecology

At any one time, 20,000 Tyrannosaurus rex roamed the Earth, calculation determines

At any one time, 20,000 Tyrannosaurus rex roamed the Earth, calculation determines

Nature reports: Ever wondered how many Tyrannosaurus rex ever roamed the Earth? The answer is 2.5 billion over the two million or so years for which the species existed, according to a calculation published today in Science1. The figure has allowed researchers to estimate just how exceedingly rare it is for animals to fossilize. Palaeontologists led by Charles Marshall at the University of California, Berkeley, used a method employed by ecologists studying contemporary creatures to estimate the population density of…

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Just 3% of the world’s ecosystems remain intact, study suggests

Just 3% of the world’s ecosystems remain intact, study suggests

The Guardian reports: Just 3% of the world’s land remains ecologically intact with healthy populations of all its original animals and undisturbed habitat, a study suggests. These fragments of wilderness undamaged by human activities are mainly in parts of the Amazon and Congo tropical forests, east Siberian and northern Canadian forests and tundra, and the Sahara. Invasive alien species including cats, foxes, rabbits, goats and camels have had a major impact on native species in Australia, with the study finding…

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America’s corn belt has lost a third of its topsoil

America’s corn belt has lost a third of its topsoil

Becca Dzombak reports: Seth Watkins has been farming his family’s land in southern Iowa for decades, growing pasture for his cows as well as corn and other row crops. His great-grandfather founded the farm in 1848. “He came in with one of John Deere’s steel plows and pierced the prairie,” Watkins recounted. With its rolling hills and neat lines of corn stretching to the horizon, broken by clumps of trees, it’s a picturesque scene. But centuries of farming those hills…

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The nature you see in documentaries is beautiful and false

The nature you see in documentaries is beautiful and false

Emma Marris writes: It’s late afternoon, late pandemic, and I’m watching a new nature documentary in bed, after taking the daintiest of hits from a weed pen. The show is called A Perfect Planet, and it is narrated by Sir David Attenborough. I am looking at the red eye of a flamingo, a molten lake surrounding a tiny black pupil. Now I am looking at drone footage of a massive colony of flamingos, the classic sweeping overhead shot, what my…

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Africa’s forest elephants are just a step from extinction

Africa’s forest elephants are just a step from extinction

The New York Times reports: While some African elephants parade across the savanna and thrill tourists on safari, others are more discreet. They stay hidden in the forests, eating fruit. “You feel pretty lucky when you catch sight of them,” said Kathleen Gobush, a Seattle-based conservation biologist and member of the African Elephant Specialist Group within the International Union for Conservation of Nature, or I.U.C.N. The threat of extinction has diminished the odds of spotting one of these wood-dwelling elephants…

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The Amazon rainforest could die in your lifetime — here’s why

The Amazon rainforest could die in your lifetime — here’s why

Anna Funk writes: Deforestation in the Amazon has long been the poster child of man-made environmental destruction. But recent trends reveal that the changing climate will likely come for this beloved rainforest long before the last tree is cut down. One researcher has even put a date on his prediction for the Amazon’s impending death: 2064. That’s the year the Amazon rainforest will be completely wiped out. Dramatic? Yes. “I’m a doom-sayer,” admits Robert Walker, a quantitative geographer at the…

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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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We are hurtling toward global suicide

We are hurtling toward global suicide

Ben Ehrenreich writes: On January 13, one week before the inauguration of Joe Biden as the forty-sixth president of the United States and seven long days after the storming of the Capitol by an armed right-wing mob, it was easy enough to miss an article published in the journal Frontiers in Conservation Science, despite its eye-catching title: “Underestimating the Challenges of Avoiding a Ghastly Future.” The headline was itself a train wreck: six dully innocuous words piling up in front…

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How bacteria and archaea influence one of Earth’s largest carbon stores as it begins to thaw

How bacteria and archaea influence one of Earth’s largest carbon stores as it begins to thaw

Monique Brouillette writes: For most of human history, permafrost has been Earth’s largest terrestrial carbon sink, trapping plant and animal material in its frozen layers for centuries. It currently stores about 1,600 billion tonnes of carbon — more than twice the amount in the atmosphere today. But thanks to rising temperatures, permafrost is fracturing and disappearing, leaving behind dramatic changes in the landscape. Scientists are becoming increasingly worried that the thaw will lead to an epic feast for bacteria and…

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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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Book review: The unintended consequences of taming nature

Book review: The unintended consequences of taming nature

By John Schwartz, Undark, February 26, 2021 Elizabeth Kolbert lives her stories. In the course of reporting her new book, “Under a White Sky: The Nature of the Future,” she got hit by a leaping carp near Ottawa, Illinois (“It felt like someone had slammed me in the shin with a Wiffle-ball bat”) and visited tiny endangered pupfish at Devils Hole, a small pool in a cave near Pahrump, Nevada. She got her socks wet walking across a mockup of the…

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Are pandemics the cost of human recklessness towards nature?

Are pandemics the cost of human recklessness towards nature?

Piyush Nanda writes: In an area devastated by deforestation, an 18-month-old toddler from the nearest settlement, Meliandou in Guinea, was seen playing around a fallen tree swarming with bats. The child then contracted a mysterious illness, which spread to many who came in contact. After it had already killed 30 people, the illness was identified as Ebola. Comprehensive studies have since connected 25 of the 27 Ebola outbreaks in Africa, like the 2014 outbreak that originated in Guinea, to regions…

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The unified cosmic vision of Alexander von Humboldt

The unified cosmic vision of Alexander von Humboldt

Algis Valiunas writes: The presiding scientific genius of the Romantic age, when science had not yet been dispersed into specialties that rarely connect with one another, Alexander von Humboldt wanted to know everything, and came closer than any of his contemporaries to doing so. Except for Aristotle, no scientist before or since this German polymath can boast an intellect as universal in reach as his and as influential for the salient work of his time. His neglect today is unfortunate…

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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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To prevent the next Covid-19, we must prioritize biodiversity

To prevent the next Covid-19, we must prioritize biodiversity

Susan Lieberman and Christian Walzer write: From the most remote terrestrial wilderness to the most densely populated cities, humans are inexorably changing the planet. We have put 1 million species at risk of extinction, degraded soil and habitats, polluted the air and water, destroyed forests and coral reefs wholesale, exploited wild species, and fostered the proliferation of invasive species. And we have caused a global climate crisis. This planetary neglect and mismanagement helped pave the way for the Covid-19 pandemic….

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Human-made stuff now outweighs every living thing on Earth

Human-made stuff now outweighs every living thing on Earth

ScienceAlert reports: All of the Amazon’s splendid greenery. Every fish in the Pacific. Every microbe underfoot. Every elephant on the plains, every flower, fungus, and fruit-fly in the fields, no longer outweighs the sheer amount of stuff humans have made. Estimates on the total mass of human-made material suggest 2020 is the year we overtake the combined dry weight of every living thing on Earth. Go back to a time before humans first took to ploughing fields and tending livestock,…

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