Monday, September 27

extinción

Animales, extinción, Extinción Masiva, lagos, Microbios, Noticias, Pérmico, ríos, sopa tóxica, Tendencias, tierra

A “toxic soup”: this was the worst extinction on Earth | Digital Trends Spanish

The late Permian mass extinction event of about 252 million years ago is considered the worst such event in our planet's history. This period has been associated with large volcanic greenhouse gas emissions, a significant increase in temperature, and the loss of almost all species of animals in the oceans and on land. Now, a group of researchers says that not even rivers and lakes were safe havens for different species, since a new cause of extinction during extreme warming events has been identified: toxic microbial blooms. In a healthy ecosystem, microscopic algae provide oxygen to aquatic animals, but when this number gets out of control, microbes deplete free oxygen and start releasing toxins into the water. Victor leshykA group of researchers' study of rocks near Sydney in Australi...
Australia, color, especie, extinción, marsupial, Noticias, restauración, Tendencias, tigre de tasmania, video, zoológico

Video of the extinct Tasmanian tiger restored to color | Digital Trends Spanish

The Tasmanian tiger, also known as the marsupial wolf or thylacine, was a carnivorous marsupial native to Australia, Tasmania, and New Guinea that became extinct in the 20th century. Thanks to a record filmed in black and white at the Beaumaris Zoo, Horbart, in December 1933, we know what this missing animal looked like. Now, thanks to an important film editing work, we can see how it looked more real through the same images, but in color. The original video was recorded by Australian zoologist David Fleay and has been colored by an international team. Meanwhile, the new record was shared by the National Sound and Film Archive of Australia (NFSA). This project spent more than 200 hours coloring and was published on the occasion of National Day for Threatened Species in Australia. In f...
Amazonas, arboles, Biodiversidad, bosque, cambio climatico, crecimiento rapido, ecología, especies, extinción, flora, Noticias, perdida, selva, Tendencias

Why do trees die in the Amazon? | Digital Trends Spanish

A study carried out by the universities of Leeds and Birmingham tried to determine the causes of death of trees in the Amazon. The results were published in Nature Communications and show that species-level growth rates are a key risk factor for tree mortality. In this regard, they realized that the fastest growing trees die at a younger age. This discovery is of great importance for understanding the future of forests, as climate change tends to "select" those species with the fastest growth. If these forests selected for climate change are more likely to die younger, they will also store less carbon. This study consists of the first large-scale analysis of the causes of death of trees in the Amazon and uses long-term records collected by the international network RAINFOR. "Under...
extinción, hombre de Neandertal, Neandertal, Prehistoria, Tendencias

A milk tooth provides data on Neanderthal extinction | Digital Trends Spanish

Determining why Neanderthals that lived in Eurasia for at least 300,000 years became extinct is still a challenge for scientists. And each new finding helps them better understand what happened to make them disappear from the face of the Earth. The last one is a milk tooth, found on a hill in Riparo del Broion in the Berici Mountains (in the city of Vicenza, northeast Italy). Scientists from the Universities of Bologna and Ferrara believe it belonged to a boy or girl who died aged 11 or 12 between 45,000 and 48,000 years ago. This means that he was one of the last Neanderthals to live in Italy, according to the study published in the Journal of Human Evolution. "According to this dating, this small milk tooth is the most recent find of the Neanderthal period in north...
aves, cráneo, dinosaurios, especies, evolución, extinción, Noticias, Tendencias

This is how birds survived the extinction of the dinosaurs | Digital Trends Spanish

About 150 million years ago, the first birds evolved from small feathered dinosaurs, similar to what we know today as birds of prey, thus becoming another branch of the dinosaur family tree. That happened in the Jurassic. For more than eighty million years, all kinds of birds emerged, and with various characteristics. Today, birds are known as "the only dinosaurs left." In hindsight, scientists are able to classify birds into avian dinosaurs, while all other types (from stegosaurus to brontosaurus) would be non-avian dinosaurs. The meteorite that fell 66 million years ago in the Yucatan Peninsula triggered the fifth mass extinction in the history of our planet. Earth became a true hell, where forest fires abounded. In total, it is estimated that 75 percent of the sp...
Devónico, Espacio, extinción, Noticias, supernova

Supernova caused one of the largest extinctions on Earth | Digital Trends Spanish

A supernova some 65 light-years away may have contributed to the depletion of the Earth's ozone layer, causing a major extinction about 359 million years ago. This is how researchers from the University of Illinois, which ensure that cosmic rays from one or more nearby supernovae could be to blame for at least one extinction event at the boundary between the Devonian and Carboniferous periods. The team focused on this period because the rocks contain hundreds of thousands of generations of plant spores, which appear to have been burned by ultraviolet light, evidence of a lasting event of Earth's ozone depletion. "Terrestrial catastrophes, such as large-scale volcanism and global warming, can also destroy the ozone layer, but the evidence for this is not conclusive for the time inte...