Popular imagery is that dinosaurs were a bland color, but most birds are have bland color palates as well. Then you have parrots or peacocks. In between the extremes of bland and flamboyant, there are pink pigeon feet, red rooster combs and yellow pelican pouches.
That may have been the case for dinosaurs as well. There’s a good chance that extinct dinosaurs rocked pops of color on similar body parts and may have flashed their colors to entice mates, just as birds do today, according to a study
in the journal Evolution led by researchers at The University of Texas at Austin.
“Living birds use an array of pigments and can be very colorful on their beaks, legs, and around their eyes,” said Sarah Davis, a doctoral candidate at the UT Jackson School of Geosciences who led the study. “We could expect that extinct dinosaurs expressed the same colors.”
The takeaway on potential dinosaur color schemes comes from broader findings about skin and tissue color in the common ancestor of living birds and extinct dinosaurs, an ancient archosaur that lived near the beginning of the Triassic period. By analyzing whether bright body color was present in living dinosaur relatives – including turtles, crocodiles and over 4,000 bird species – the researchers determined that the common ancestor had a 50% chance of having bright colors in the soft tissues of its body.
A simplified evolutionary tree showing where bright colors appear on birds and other living species from this studyand where these colors may have appeared on their extinct relatives, including dinosaurs. Skin (shown in orange), and scalesand beak keratin (yellow) could have been brightly pigmented in extinct groups, whereasfeathers and claws would probablynot have been. Areas without bright color are shown in gray. Credit: Sarah Davis/ The University of Texas at Austin
The bright colors examined in the study typically come from carotenoids – a class of colorful red, orange and yellow pigments that birds extract from their food. Carotenoids do not fossilize as well as brown and black pigments, which means scientists must study color in living animals to look for clues about color expression in their extinct ancestors.
The researchers used the data collected from birds and other animals to make phylogenic reconstructions, a scientific method used to investigate the evolutionary histories of species. The 50% estimate for bright color applies equally to skin, beaks and scales of the ancient archosaur. In contrast, the research found that there was a 0% chance that claws and feathers were brightly colored, which is consistent with other research, Davis said.
The study also examined the connection between color and a diet high in carotenoids, with Davis finding that birds with higher carotenoid diets (plant- and invertebrate-rich) were more likely to be colorful than meat eaters. What’s more, she found that plant-eating birds expressed bright colors in more places on their bodies than meat eaters or omnivores.
“The earliest dinosaurs were pony-sized and ate large, vertebrate prey,” said study co-author Julia Clarke, a professor at the Jackson School. “Different groups shifted to plant-dominated or mixed diets. This shift likely led to changes in coloration of skin and non-feather tissues.”
In addition to coloring the past, the research puts living birds in a new perspective. Davis said that the bird groups examined in the study have a reputation for being drab – especially in comparison to songbirds, which were excluded from the study because they are the most distantly related to their nonavian dinosaur ancestors.
But aside from their feathers, the birds turned out to be quite colorful. The study found that about 54% of the 4,022 bird species studied had bright colors. Of this group, 86% of species expressed bright color in only non-feathered tissues.
Mary Caswell Stoddard, an associate professor at Princeton University, said that the study provides important insights on bird color that often go overlooked.
“There is so much more to birds’ color than their plumage – just think of the vibrant orange-yellow bill of a toco toucan – but feathers tend to get the most attention,” she said. “This study unravels the evolutionary history of carotenoid-based coloration not just in plumage but also in the beaks and skin of birds and their relatives.”
The study was funded by the National Science Foundation and the Jackson School.
Massive Iceberg Released Over 150 Billion Tons of Fresh Water Into Ocean As It Scraped Past South Georgia – SciTechDaily
Scientists monitoring the giant A68A Antarctic iceberg from space reveal that a huge amount of fresh water was released as it melted around the sub-Antarctic island of South Georgia.
152 billion tonnes of fresh water – equivalent to 20 x Loch Ness or 61 million Olympic sized swimming pools, entered the seas around the sub-Antarctic island of South Georgia when the megaberg A68A melted over 3 months in 2020/2021, according to a new study.
In July 2017, the A68A iceberg snapped off the Larsen-C Ice Shelf on the Antarctic Peninsula and began its epic 3.5 year, 4000 km journey across the Southern Ocean. At 5719 square kilometers in extent – quarter the size of Wales –, it was the biggest iceberg on Earth when it formed and the sixth largest on record. Around Christmas 2020, the berg received widespread attention as it drifted worryingly close to South Georgia, raising concerns it could harm the island’s fragile ecosystem.
Researchers from the Centre for Polar Observation and Modelling (CPOM) and British Antarctic Survey (BAS) used satellite measurements to chart the A68A iceberg’s area and thickness change throughout its life cycle. The authors show that the berg had melted enough as it drifted to avoid damaging the sea floor around South Georgia by running aground. However, a side effect of the melting was the release of a colossal 152 billion tonnes of fresh water in close proximity to the island – a disturbance that could have a profound impact on the island’s marine habitat.
For the first two years of its life, A68A stayed close to Antarctica in the cold waters of the Weddell Sea and experienced little in the way of melting. However, once it began its northwards journey across Drake Passage it traveled through increasingly warm waters and began to melt. Altogether, the iceberg thinned by 67 meters from its initial 235 m thickness, with the rate of melting rising sharply as the berg drifted in the Scotia Sea around South Georgia.
Laura Gerrish, GIS and mapping specialist at BAS and co-author of the study said:
“A68 was an absolutely fascinating iceberg to track all the way from its creation to its end. Frequent measurements allowed us to follow every move and break-up of the berg as it moved slowly northwards through iceberg alley and into the Scotia Sea where it then gained speed and approached the island of South Georgia very closely.”
Thinning and breakage of the A68A iceberg over time. Melt rates increase sharply once the iceberg is drifting in open ocean north of the Antarctic peninsula. Iceberg thickness was derived from satellite altimetry data from Cryosat-2 and ICESat-2. Iceberg shape and size were sourced from Sentinel-1, Sentinel-3 and MODIS satellite data. Credit: Anne Braakmann-Folgmann CPOM
If an iceberg’s keel is too deep it can get stuck on the sea floor. This can be disruptive in several different ways; the scour marks can destroy fauna, and the berg itself can block ocean currents and predator foraging routes. All of these potential outcomes were feared when A68A approached South Georgia. However, this new study reveals that it collided only briefly with the sea floor and broke apart shortly afterward, making it less of a risk in terms of blockage. By the time it reached the shallow waters around South Georgia, the iceberg’s keel had reduced to 141 meters below the ocean surface, shallow enough to avoid the seabed which is around 150 meters deep.
Nevertheless, the ecosystem and wildlife around South Georgia will certainly have felt the impact of the colossal iceberg’s visit. When icebergs detach from ice shelves, they drift with the ocean currents and wind while releasing cold fresh meltwater and nutrients as they melt. This process influences the local ocean circulation and fosters biological production around the iceberg. At its peak, the iceberg was melting at a rate of 7 meters per month, and in total it released a staggering 152 billion tonnes of fresh water and nutrients.
Anne Braakmann-Folgmann, a researcher at CPOM and PhD candidate at the University of Leeds’ School of Earth and Environment, is lead author of the study. She said:
“This is a huge amount of melt water, and the next thing we want to learn is whether it had a positive or negative impact on the ecosystem around South Georgia.
“Because A68A took a common route across the Drake Passage, we hope to learn more about icebergs taking a similar trajectory, and how they influence the polar oceans.”
The journey of A68A has been charted using observations from 5 different satellites. The iceberg’s area change was recorded using a combination of Sentinel-1, Sentinel-3, and MODIS imagery. Meanwhile, the iceberg’s thickness change was measured using CryoSat-2 and ICESat-2 altimetry. By combining these measurements, the iceberg’s area, thickness, and volume change were determined.
Tommaso Parrinello, CryoSat Mission Manager at the European Space Agency, said:
“Our ability to study every move of the iceberg in such detail is thanks to advances in satellite techniques and the use of a variety of measurements. Imaging satellites record the location and shape of the iceberg and data from altimetry missions add a third dimension as they measure the height of surfaces underneath the satellites and can therefore observe how an iceberg melts.”
Reference: “Observing the disintegration of the A68A iceberg from space” by A. Braakmann-Folgmann, A. Shepherd, L. Gerrish, J. Izzard and A. Ridout, 10 January 2022, Remote Sensing of Environment.
Shattered 'alphabet soup' iceberg flushed a lot of fresh water into the ocean – Space.com
A rogue iceberg that drifted dangerously close to an Antarctic penguin population in 2020 and 2021 released billions of tons of fresh water into the ocean during its breakup.
A new study, based on satellite data, tracks the aftermath of the once-mighty iceberg A-68a, which held the title of world’s largest iceberg for more than three years before shattering into a dozen pieces. (NASA’s Earth Observatory once dubbed the various mini-bergs “alphabet soup.”)
For a while, there were worries the iceberg might threaten a penguin-filled island called South Georgia, located about 940 miles (1,500 kilometers) northeast of the Antarctic Peninsula. Happily, that never came to pass, but the new research shows that the iceberg flooded the region with fresh water, potentially affecting the local ecosystem and providing yet another example of the effects of global warming on the oceans.
The research consulted data gathered by missions including Sentinel-1 (operated by European Space Agency, or ESA), Sentinel-3 (ESA), CryoSat-2 (ESA) and ICESat-2 (NASA), as well as the Moderate Resolution Imaging Spectroradiometer, or MODIS, instrument that flies aboard two NASA satellites, Aqua and Terra.
The satellite data shows that during the iceberg’s three-month melting period in late 2020 and early 2021, the former A-68a flushed into the ocean about 162 billion tons (152 billion metric tonnes) of fresh water — equivalent to 61 million Olympic-sized swimming pools, according to a press release from United Kingdom study participant University of Leeds.
“The berg had melted enough as it drifted to avoid damaging the sea floor around South Georgia by running aground,” the university stated. “However, a side effect of the melting was the release of a colossal 152 billion tonnes of fresh water in close proximity to the island — a disturbance that could have a profound impact on the island’s marine habitat.”
Fresh meltwater and nutrients tend to flow from melting icebergs. The freshwater flooding alters ocean circulation and the ocean ecosystem nearby the glacier fragment, the university noted.
“The next thing we want to learn is whether it had a positive or negative impact on the ecosystem around South Georgia,” Leeds lead author and Ph.D. candidate Anne Braakmann-Folgmann said in the same statement.
She noted the iceberg moved across a common ocean “highway” known as the Drake Passage, so the fate of A68-A may help understand how icebergs in that zone influence the ocean in general.
A study based on the research was published in the forthcoming March 1 issue of Remote Sensing of Environment.
Robot dog that can hike peaks in the Swiss Alps unaided could be used on other planets – Euronews
This robot dog hiked over a steep mountain in Switzerland – and it didn’t need the help of its humans to overcome the many obstacles of the rough terrain.
The skilled dog bot could be used to reach areas that are too dangerous or inaccessible to humans, including other planets, according to its creators.
The research by ETH Zurich effectively allows ANYmal, a four-legged robot dog, to move quickly over rough terrain while still taking care – a new trait for robots.
The robot dog is able to work out how to walk over any terrain by combining what its sensors can “see” with what it knows about its surroundings, just like people or animals.
“Until now when a robot used perception mostly they were just assuming that the map is always correct,” said Takahiro Miki, a PhD student at the Robotics Systems Lab at ETH Zurich.
“But often when we go outdoors this doesn’t happen, like when you go into the tall grass”.
The team used landscapes with visual obstacles like deep snow and tall grass as an example of when a robot’s camera systems produce a map of the landscape that doesn’t work when the robot puts its foot down.
ANYmal’s control system allows it to prioritise its sense of touch over its visual perception.
The team put the ability to the test on a hiking route up Mount Etzel in the Swiss Alps which stands 1,098 metres above sea level.
“The slope was quite steep, like it was even hard sometimes for us. It was quite exhausting but the robot could go over all of these obstacles and we didn’t need to help the robot,” Miki said.
The scientists hope the new skill could allow ANYmal to be deployed anywhere on Earth and on space missions to other planets.
Hundreds of four-legged robots, many of them made by Hyundai-owned Boston Dynamics, are already in use, some in hostile industrial environments, including one performing survey work in Chernobyl and another working on a BP oil rig in the Gulf of Mexico.
For more on this story, watch the video in the media player above.
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