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Category: Ecology

Ancient fires, spurred by human activity, drove large mammals extinct, study suggests

Ancient fires, spurred by human activity, drove large mammals extinct, study suggests

The New York Times reports: Wildfires are getting worse. Parts of the United States, scientists say, are experiencing wildfires three times as often — and four times as big — as they were 20 years ago. This summer alone, smoke from Canadian blazes turned North American skies an unearthly orange, “fire whirls” were seen in the Mojave Desert and raging flames in Maui led to disaster. Records of the distant past can reveal what once drove increased fire activity and…

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Critics of ‘degrowth’ economics say it’s unworkable – but from an ecologist’s perspective, it’s inevitable

Critics of ‘degrowth’ economics say it’s unworkable – but from an ecologist’s perspective, it’s inevitable

Shutterstock/Matt Sheumack By Mike Joy, Te Herenga Waka — Victoria University of Wellington You may not have noticed, but earlier this month we passed Earth overshoot day, when humanity’s demands for ecological resources and services exceeded what our planet can regenerate annually. Many economists criticising the developing degrowth movement fail to appreciate this critical point of Earth’s biophysical limits. Ecologists on the other hand see the human economy as a subset of the biosphere. Their perspective highlights the urgency with…

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Earth’s story is not about dynasties but communities

Earth’s story is not about dynasties but communities

Riley Black writes: The worst day in the entire history of life on Earth happened in the northern springtime. On that day, the last of the Age of Dinosaurs, a roughly seven-mile-wide chunk of rock that had been hurtling towards our orbit for millions of years slammed into Earth’s midsection and immediately brought the Cretaceous to a close. The consequences were so dire that survival in the hours immediately following impact was merely a matter of luck. Of course, life…

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Ocean heat record broken, with grim implications for the planet

Ocean heat record broken, with grim implications for the planet

BBC News reports: The oceans have hit their hottest ever recorded temperature as they soak up warmth from climate change, with dire implications for our planet’s health. The average daily global sea surface temperature beat a 2016 record this week, according to the EU’s climate change service Copernicus. It reached 20.96C (69.73F) – far above the average for this time of year. Oceans are a vital climate regulator. They soak up heat, produce half Earth’s oxygen and drive weather patterns….

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How Costa Rica saved its biodiversity

How Costa Rica saved its biodiversity

CNN reports: Pedro Garcia nurses a plate of seeds on his lap. “This is my legacy,” he says, tenderly picking up the seed of a mountain almond – a tree which can grow up to 60 meters (200 feet) tall and is a favored nesting spot for the endangered great green macaw. Aged 57, Garcia has worked on his seven-hectare plot, El Jicaro, in northeast Costa Rica’s Sarapiqui region for 36 years. In his hands it has turned from bare…

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Modern ‘sixth mass extinction’ event will be worse than first predicted, says report

Modern ‘sixth mass extinction’ event will be worse than first predicted, says report

GrrlScientist writes: Tragically, the global mass extinction event that we find ourselves in the midst of will be even worse than originally predicted, according to a recent study (ref). The international team of scientists came to their conclusion after analyzing population trends data for more than 71,000 animal species — including mammals, birds, reptiles, amphibians, fish and insects — from around the world to see how their numbers have changed since record-keeping first began. Generally, scientists agree that an extinction…

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Reflecting on extinction

Reflecting on extinction

Terry Tempest Williams writes: On the 50th anniversary of the Endangered Species Act, I am thinking about extinction and what that means for a creature, a living being, to vanish from existence. Say their names: great auk, passenger pigeon, Carolina parakeet, Steller’s sea cow, Caribbean monk seal, Great Plains wolf, Puerto Rican long-nosed bat, Maryland darter, Utah lake sculpin, Labrador duck, heath hen, Bachman’s warbler, Xerces blue butterfly, Wyoming toad, and Panamanian golden frog—all extinct beginning in the 1800s to…

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The microorganism that shaped humanity

The microorganism that shaped humanity

Rob Dunn writes: Humans engage in mutualisms (mutually beneficial relationships) with many species; scientists describe a subset of these relationships as domestication, where one species exerts control over the other. For example, we might say that leaf-cutter ants have domesticated the fungi that they grow to feed their babies, or that some ants have domesticated the aphids that they rely on as cattle, ferrying them from branch to branch and protecting them from predators and parasites. Generally, when a mutualism…

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In a fierce desert, microbe ‘crusts’ show how life tamed the land

In a fierce desert, microbe ‘crusts’ show how life tamed the land

Zack Savitsky writes: In 2017, a team of scientists from Germany trekked to Chile to investigate how living organisms sculpt the face of the Earth. A local ranger guided them through Pan de Azúcar, a roughly 150-square-mile national park on the southern coast of the Atacama Desert, which is often described as the driest place on Earth. They found themselves in a flat, gravelly wasteland interrupted by occasional hills, where hairy cacti reached their arms toward a sky that never…

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Out of the wild

Out of the wild

Samuel Matlack writes: On the Galápagos island of Floreana, a giant tortoise went extinct some 150 years ago, after human settlement. Conservationists are now working to bring its descendants, discovered on nearby islands, back to Floreana. But there is a problem: Rats, which came with the settlers and eat tortoise eggs and babies, run rampant there. If you could help bring back the tortoise by poisoning all of the island’s rats, would you do it? Here is an important detail:…

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The key to species diversity may be in their similarities

The key to species diversity may be in their similarities

Veronique Greenwood writes: More than four decades ago, field ecologists set out to quantify the diversity of trees on a forested plot on Barro Colorado Island in Panama, one of the most intensively studied tracts of forest on the planet. They began counting every tree with a trunk wider than a centimeter. They identified the species, measured the trunks and calculated the biomass of each individual. They put ladders up the trees, examined saplings and recorded it all in sprawling spreadsheets….

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The Arctic and Atlantic oceans are merging. It could be disastrous

The Arctic and Atlantic oceans are merging. It could be disastrous

William von Herff writes: In the Fram Strait off Greenland’s west coast, Véronique Merten encountered the foot soldiers of an invasion. Merten was studying the region’s biodiversity using environmental DNA, a method that allows scientists to figure out which species are living nearby by sampling the tiny pieces of genetic material they shed, such as scales, skin, and feces. And here, in a stretch of the Arctic Ocean 400 kilometers north of where they’d ever been seen before: capelin. And…

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The Amazon river in the sky

The Amazon river in the sky

Daniel Henryk Rasolt writes: High in the Andes Mountains, the mighty Amazon River begins. It trickles from glaciers and oozes from mountain wetlands. It gains momentum and volume and feeds into clear streams and muddy rivers that pass through high cloud forests and lowland valleys. The torrents of the waters carry nutrients through the vast Amazon River basin, some 4,000 miles across the rest of the South American continent. At the same time, in the rainforest and delta estuaries, another,…

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A shocking number of birds are in trouble

A shocking number of birds are in trouble

Emily Sohn writes: The North American Breeding Bird Survey, organized by the US Geological Survey and Environment Canada, has enlisted thousands of participants to observe birds along roadsides each June since 1966. Audubon’s Christmas Bird Count, which began in 1900, encourages people to join a one-day bird tally scheduled in a three-week window during the holiday season. There are shorebird censuses and waterfowl surveys, all powered by citizen scientists. This wealth of longitudinal recordings started to turn up signs of distress as…

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The Kakhovka Dam collapse is an ecological disaster

The Kakhovka Dam collapse is an ecological disaster

Chris Baraniuk writes: A push notification news alert on his phone, then images of the deluge—that’s how Heorhiy Veremiychyk learned of the disaster. With water pouring through the stricken Kakhovka Dam in the Kherson region of Ukraine, he immediately understood the enormity of what had happened. “The water raised very sharply,” he says, referring to the terrible effects on wildlife downstream. “There was no possibility to escape.” Veremiychyk, of the National Ecological Center of Ukraine (NECU), says the impact of…

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Merlin Sheldrake wants us to understand the genius of fungi

Merlin Sheldrake wants us to understand the genius of fungi

Jennifer Kahn writes: One evening last winter, Merlin Sheldrake, the mycologist and author of the best-selling book “Entangled Life,” was headlining an event in London’s Soho. The night was billed as a “salon,” and the crowd, which included the novelist Edward St. Aubyn, was elegant and arty, with lots of leggy women in black tights and men in perfectly draped camel’s-hair coats. “Entangled Life” is a scientific study of all things fungal that reads like a fairy tale, and since…

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