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Category: Ecology

Like in ‘postapocalyptic movies’: Heat wave killed marine wildlife en masse

Like in ‘postapocalyptic movies’: Heat wave killed marine wildlife en masse

The New York Times reports: Dead mussels and clams coated rocks in the Pacific Northwest, their shells gaping open as if they’d been boiled. Sea stars were baked to death. Sockeye salmon swam sluggishly in an overheated Washington river, prompting wildlife officials to truck them to cooler areas. The combination of extraordinary heat and drought that hit the Western United States and Canada over the past two weeks has killed hundreds of millions of marine animals and continues to threaten…

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Heatwaves and drought are killing trees at an alarming rate

Heatwaves and drought are killing trees at an alarming rate

Juniper trees, common in Arizona’s Prescott National Forest, have been dying with the drought. Benjamin Roe/USDA Forest Service via AP By Daniel Johnson, University of Georgia and Raquel Partelli Feltrin, University of British Columbia Like humans, trees need water to survive on hot, dry days, and they can survive for only short times under extreme heat and dry conditions. During prolonged droughts and extreme heat waves like the Western U.S. is experiencing, even native trees that are accustomed to the…

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African great apes to suffer massive range loss in next 30 years

African great apes to suffer massive range loss in next 30 years

Science Daily reports: A new study published in the journal Diversity and Distributions predicts massive range declines of Africa’s great apes — gorillas, chimpanzees and bonobos — due to the impacts of climate change, land-use changes and human population growth. For their analysis, the authors compiled information on African ape occurrence held in the IUCN SSC A.P.E.S. database, a repository that includes a remarkable amount of information on population status, threats and conservation for several hundred sites, collected over 20…

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Pesticides are killing the world’s soils

Pesticides are killing the world’s soils

Nathan Donley and Tari Gunstone write: Scoop up a shovelful of healthy soil, and you’ll likely be holding more living organisms than there are people on the planet Earth. Like citizens of an underground city that never sleeps, tens of thousands of subterranean species of invertebrates, nematodes, bacteria and fungi are constantly filtering our water, recycling nutrients and helping to regulate the earth’s temperature. But beneath fields covered in tightly knit rows of corn, soybeans, wheat and other monoculture crops,…

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Microbes are a missing piece in the biodiversity puzzle

Microbes are a missing piece in the biodiversity puzzle

Ian Morse writes: Scientists are clear: the number of plant and animal species on Earth is declining. The climate crisis, habitat loss, pollution and the illegal wildlife trade are all pushing species toward extinction. Researchers especially worry that losing too much biodiversity could push the earth past a tipping point into irreversible change, and on into a new paradigm in which humanity and other life can’t survive. Which partly explains humanity’s self-interest and urgency in understanding and maintaining global biodiversity….

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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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