mass extinction – आवारा मुसाफिर

Sea life bounced back fast after the ‘mother of mass extinctions’

February 11, 2023913 Views

A treasure trove of fossils uncovered in China challenges the idea that marine animals took millions of years to recover from the world’s worst die-off An exceptionally well-preserved trove of fossils uncovered in southern China represents a complex marine ecosystem from the dawn of modern life, according to a study published in Science today. The organisms of the Guiyang biota lived around 251 million years ago, just one million years after the world’s worst known mass-extinction event, at the end of the Permian period. This suggests that ecosystems recovered much more rapidly than previously thought. Palaeontologist Xu Dai discovered the fossils in 2015, when he was at the China University of Geosciences in Wuhan. Between 2015 and 2019 — before the COVID-19 pandemic interrupted ...

खबरनामाघटनाएं

U.N. summit aims for global pact to protect nature

AWARA MUSAFIR BUREAU

December 6, 2022197 Views

Countries are gathering for a key U.N. nature conference in Montreal, aiming to broker a new global agreement to protect what's left of Earth's wildlife and natural spaces. Negotiators hope that the two-week summit, known as COP15, yields a deal that ensures there is more "nature" — animals, plants, and healthy ecosystems — in 2030 than what exists now. But how that progress is pursued and measured will need to be agreed by all 196 governments under the U.N. Convention on Biological Diversity (CBD). FILE PHOTO: A hammerhead shark swims close to Wolf Island at Galapagos Marine Reserve. REUTERS/Jorge Silva "How do you translate 'nature positive' into an actual term we can measure?" said Basile van Havre, one of the co-chairs of the group responsible for drafting the agreement. "Tha...

खबरनामाघटनाएं

Action needed to avoid mass extinction, say global team of experts

AWARA MUSAFIR BUREAU

July 19, 2022183 Views

Global biodiversity survey finds more species are threatened with extinction than previously thought “Biodiversity loss is one of our biggest environmental challenges in the world, probably more important than climate change. The problem of climate change can be corrected by stopping the emission of more carbon dioxide into the atmosphere. If you lose a species, it’s gone forever,” says Professor Johannes Knops, a researcher at Xi’an Jiaotong-Liverpool University. Professor Knops is one of more than 60 experts who have co-authored a major global study of biodiversity loss, recently published in the journal Frontiers in Ecology and the Environment, one of the highest ranked specialised ecology journals. Golden lion tamarins, also known as Golden marmosets, are an endangered specie...

खबरनामाघटनाएं

Are we already in the Sixth Mass Extinction of global biodiversity!

AWARA MUSAFIR BUREAU

January 16, 2022516 Views

Strong evidence shows process is already underway caused by human activities The history of life on Earth has been marked five times by events of mass biodiversity extinction caused by extreme natural phenomena. Today, many experts warn that a Sixth Mass Extinction crisis is underway, this time entirely caused by human activities. A comprehensive assessment of evidence of this ongoing extinction event was published recently in the journal Biological Reviews by biologists from the University of Hawai‘i at Mānoa and the Muséum National d’Histoire Naturelle in Paris, France. Shells of land snails from Rurutu (Austral Islands, French Polynesia) -- recently extinct before they were collected and described scientifically. Phot: O. Gargominy, A. Sartori “Drastically increased rates o...

उत्तर अमेरिकाजलवायु परिवर्तन

Climate change might be behind disappearance of ancient bears and lions

AWARA MUSAFIR BUREAU

January 6, 2022371 Views

Lions and brown bears colonized North America in multiple synchronous waves of dispersal across the Bering Land Bridge An international team of researchers led by the University of Adelaide, suggest a change in climate is the likely cause of the mysterious disappearance of ancient lions and bears from parts of North America for a thousand years or more prior to the last Ice Age. In a study in Molecular Ecology, the researchers sequenced DNA from fossils of cave lions and bears from North America and Eurasia to better understand the timing and drivers of their past movement between continents. Co-author, Dr Kieren Mitchell from the University of Adelaide’s Australian Centre for Ancient DNA said, “There's a common perception that outside of mass extinctions or direct human inte...