Los Angeles County sets record for highest temperature

Denver to face temperature plunge from 99 to 32 in one day

September snow, cold to plunge across Rockies early this week

SEPT. 6, 2020 

Los Angeles County sets record for highest temperature

Sunday's heatwave has politicians and power utilities calling on residents to conserve energy as tens of thousands lost power. Photo courtesy of Los Angeles Department of Water and Power/Twitter

Sept. 6 (UPI) -- The National Weather Service said Los Angeles County experienced its highest official temperature ever recorded on Sunday.

The federal agency said Woodland Hills registered a temperature of 121 degrees Fahrenheit just before 1:30 p.m. Sunday, topping the previous 119-degree record set on July 22, 2006.

"This broke the all-time record high temperature for the station," the NWS said in a 1: 32 p.m. statement. "This is also the highest temperature ever observed at an official recording station in Los Angeles County or in the Los Angeles County Warning Area, which includes San Luis Obispo County, Santa Barbara County, Ventura County and Los Angeles County."

Weather stations in Paso Robles, Santa Maria, Santa Barbara, Camarillo, Down Town Los Angeles, Long Beach, Burbank, Lancaster and Palmdale all registered high-temperature records on Sunday, the NWS said in a 6:18 p.m. update, adding that several of the records had stood since 1955.

RELATED National Guard says California on pace for record wildfire season

The heat spike caused the California Independent System Operator to issue an energy conservation warning that was to be in effect until 9 p.m.

"It's time, California," it said on Twitter. "Let's do this together."

Los Angeles Mayor Eric Garcetti said the heatwave was causing power outages throughout the city and crews would be working to restore the power as soon as possible.

"Time to turn off major appliances, set the thermostat to 78 degrees (or use a fan instead), turn off excess lights and unplug any appliances you're not using," the mayor tweeted. "We need every Californian to help conserve energy. Please do your part."

More than 60,000 homes were without power as of 8 p.m. PDT, according to poweroutage.us.

The Los Angeles Department of Water and Power estimated power would be restored between 24 to 36 hours from the start of the outage

Sunday's record occurred nearly a month after California's Death Valley registered what may have been Earth's hottest temperature ever recorded at 130 degrees on Aug. 16.

Denver to face temperature plunge from 99 to 32 in one day
By  Chaffin Mitchell, Accuweather.com


Forecasters are predicting a high of 99 degrees Fahrenheit in Denver on Sunday afternoon, followed by a low of 34 degrees on Monday night. Photo by mrminibike/pixabay

Sept. 6 (UPI) -- Residents in Denver are set to experience summer and winterlike temperatures within the span of just 24 hours.

Forecasters are predicting a high of 99 degrees Fahrenheit in Denver on Sunday afternoon, followed by a low of 34 degrees on Monday night, which could be a record-setting temperature drop.

"This would be the earliest in recorded history that a swing of this magnitude occurs," AccuWeather Meteorologist Jake Sojda said. Sojda said this is due to a powerful storm system and large dip in the jet stream that will direct a shot of Arctic air into the Plains and central Rockies from Monday through Tuesday.

"The flat terrain of the High Plains allows strong, gusty northerly winds to push the fresh Arctic air southward along the Front Range very quickly and efficiently. The air doesn't have time to moderate leading to a very sharp change in temperature," Sojda said.

While Sojda says a 50- to 60-degree temperature change in one day is not particularly uncommon in Denver, and has happened many times in the city since weather data recording began in Denver in 1872, usually a surge of Arctic air like this happens in the winter months. This will likely be the most significant push of cold air between November and February.

"The previous record was from Sept. 19, 2010, when the temperature fell from 96 to 41 in one day, a 55-degree drop. The next earliest was Oct. 9, 2019, another 55-degree drop when when the temperature went from a high of 83 to a low of 28," Sojda said.

The all-time record for the largest one-day temperature change occurred on Jan. 25th, 1872, when Denver fell from a high of 46 to a low of -20, a 66-degree change, Sojda reports.

"With a forecast high in the low to mid-90s on Monday, and then a low in the low to mid-30s Monday night, this event could fall in the top five all-time for one-day changes, but will likely fall a little short of the all-time record," Sojda said.

Still, for it technically being summer, this is going to be a historic event

RELATED September snow, cold to plunge across Rockies early this week

"There was also a two-day temperature change of 76 degrees on Dec. 14, 2008, when Denver went from a high 58 to a low -18," Sojda said.

Severe thunderstorms are not expected to be triggered from this, according to Sojda, but strong and locally damaging wind gusts as well as heavy snow in higher elevations will be a problem.

"Because of the heat leading up to this, in cities like Denver, the ground and especially paved surfaces will still have a lot of heat content. This is going to make it difficult for snow to accumulate and snow totals will almost certainly be much lower than if it were mid-winter. Still, elevated surfaces can still cool very rapidly and turn icy. This could make bridges and overpasses icy, even if snow isn't piling up on the ground around them," Sojda said.

Higher elevations, above 6,000 to 7,000 feet, will get colder, and the heat still contained in the ground may be eliminated more efficiently, Sojda said, which allows for more accumulation and even some slushy and icy roads.

"The drastic change in temperature can also have a big effect on infrastructure. Railroads, in particular, are susceptible as the rail lines can warp and buckle both with the extreme heat but also the extreme change," Sojda said.

According to AccuWeather Lead Storm Warning Meteorologist Brian Knopick, the rails expand in the high heat, and sometimes measures need to be taken to allow for this expansion without damage occurring to the rails. But, then when the temperatures rapidly drops 40 or 50 degrees or more, the rail contracts again and can leave gaps at the seams.

If these become large enough, they can damage the wheels of a train and even cause it to derail.

upi.com/7035992

September snow, cold to plunge across Rockies early this week
By
Courtney Spamer, Accuweather
(0)





Sept. 6 (UPI) -- A drastic temperature swing and a dose of early season snow will have residents from Montana to New Mexico wondering what month it is by Tuesday.

A storm is forecast to bring a mixture of rain and snow across the Intermountain West and the Plains Monday through Tuesday night, spreading precipitation from northern Montana to Texas.

Snow is forecast to begin falling in the northern Rockies of Montana and Wyoming on Monday, before extending southward through northeastern Utah, Colorado, and northern New Mexico into midweek.

Ski resorts in Montana have had a few snow showers already this year. Big Sky Resort in southwestern Montana got a few flakes on the last day of meteorological summer, Aug. 31.

"Snow is common for the northern Rockies in the month of September, but the earliest measurable snow accumulation on record for a place like Denver is Sept. 3," said AccuWeather Meteorologist Nicole LoBiondo.

With snow set to arrive in the greater Denver area early Tuesday, that's less than a week after the earliest snowfall on record.

A significant snowfall is in store above 7,000 feet, on average, from western Montana to Wyoming and Colorado. It is in this area that 6-12 inches of snow is forecast and an AccuWeather Local StormMax™ of 18 inches is possible.

With elevations of 5,000 to 7,000 feet from Montana to northern New Mexico, a few inches of snow can fall, especially on non-paved surfaces. But, overall, snowfall levels will tend to be lower across the northern part of the Rockies, amounting to more snow.

Elevations below 5,000 feet are forecast to see a few flakes, which at times are likely to be mixed in with rain. Perhaps enough snow could fall for a dusting of snow on non-paved surfaces, but any accumulations will likely be slushy.

Roadways are likely to initially be wet given the magnitude of the heat ahead of the storm. As the cold air arrives with the storm and the ground begins to cool, however, roads and sidewalks could turn slick early on Tuesday. Pedestrians and motorists alike should be aware of the risk for slippery travel.

The weight of the snowfall on fully leafed trees could cause limbs and branches to break. In addition to damage to trees, fallen limbs could also lead to more widespread power outages.

In addition to the snow, this storm will usher in a temperature swing of as much as 65 degrees Fahrenheit in less than 48 hours.

A dip in the jet stream will allow cold air from Canada to rush southward and bring record-challenging low temperatures in cities like Billings, Mont., Cheyenne, Wyo., and Denver.

After Denver set an all-time record high for September of 101 on Saturday, a strong cold front of the will help cold air to infiltrate the Colorado capital, bringing temperatures into the 30s Monday night.

Protesters march on Rochester as mayor announces police reforms

Sept. 7 (UPI) -- Protesters in Rochester, N.Y., marched for a fifth consecutive night Sunday against the police-involved death of Daniel Prude as the mayor announced law enforcement reforms and called for calm.

The Rochester police department said 1,000 protesters had turned out Sunday night and had descended upon the Public Safety Building.

"Let's work together to keep everyone safe!!" the department said on Twitter.
The protestors have arrived to the Public Safety Building. Let's work together!!— Rochester NY Police (@RochesterNYPD) September 7, 2020

Protests erupted in the city after police-worn camera footage of Prude's encounter with police in March was released on Wednesday, prompting his family and activists to call for RPD to be better trained to handle mental health crises.

Prude, 41, died March 30, one week after he was detained during what his family described as a mental health episode.

Rochester Mayor Lovely Warren earlier Sunday announced during a press conference that the availability of mental health officials will be doubled at that the crisis intervention unit and its budget will be moved from the police department to the city's Department of Youth and Recreation Services.

"It is my solemn duty as the mayor of this city to honor Mr. Prude, to not let his death be in vain and to do everything possible to transform how we police our city, to truly protect and serve our residents," she said.

Warren said a group of church elders was to be bussed in for Sunday night to create a buffer between the police and protesters while calling for the situation to de-escalate.

"No one of us can do anything alone," she said. "It takes people reaching across, working together to ensure we have a brighter future."

Police chief La'Ron Singletary told reporters during the press conference that police reforms are moving forward and vowed to work with the community to protect the protesters' First Amendment rights.

"We want to make sure that Mr. Prude's death changes how we do policing in this city," he said. "Moving forward, we are dedicated to taking te necessary actions to prevent this from ever happening again."

A day after the video was released, Warren announced the suspension of seven police officers and apologized to the Prude family and on Friday, New York Attorney General Letitia James moved to empanel a grand jury as part of its investigation into Prude's death.

 

COVID-19 patients suffer long-term lung and heart damage but it can improve with time

Coronavirus patients recover faster if they undergo rehabilitation as soon as possible after coming off ventilators or leaving intensive care

EUROPEAN LUNG FOUNDATION

Research News

 

IMAGE: CT SCAN OF PATIENT'S LUNGS SHOWING COVID-19 DAMAGE IN RED view more 

CREDIT: GERLIG WIDMANN AND TEAM, DEPARTMENT OF RADIOLOGY, MEDICAL UNIVERSITY OF INNSBRUCK.

COVID-19 patients can suffer long-term lung and heart damage but, for many, this tends to improve over time, according to the first, prospective follow-up of patients infected with the coronavirus, presented at the European Respiratory Society International Congress. [1]

Researchers in the COVID-19 'hot spot' in the Tyrolean region of Austria recruited consecutive coronavirus patients to their study, who were hospitalised at the University Clinic of Internal Medicine in Innsbruck, the St Vinzenz Hospital in Zams or the cardio-pulmonary rehabilitation centre in Münster, Austria. In their presentation to the virtual congress today (Monday), they reported on the first 86 patients enrolled between 29 April and 9 June, although now they have over 150 patients participating.

The patients were scheduled to return for evaluation six, 12 and 24 weeks after their discharge from hospital. During these visits, clinical examinations, laboratory tests, analysis of the amounts of oxygen and carbon dioxide in arterial blood, lung function tests, computed tomography (CT) scans and echocardiograms were carried out.

At the time of their first visit, more than half of the patients had at least one persistent symptom, predominantly breathlessness and coughing, and CT scans still showed lung damage in 88% of patients. However, by the time of their next visit 12 weeks after discharge, the symptoms had improved and lung damage was reduced to 56%. At this stage, it is too early to have results from the evaluations at 24 weeks.

"The bad news is that people show lung impairment from COVID-19 weeks after discharge; the good news is that the impairment tends to ameliorate over time, which suggests the lungs have a mechanism for repairing themselves," said Dr Sabina Sahanic, who is a clinical PhD student at the University Clinic in Innsbruck and part of the team that carried out the study, which includes Associate Professor Ivan Tancevski, Professor Judith Löffler-Ragg and Dr Thomas Sonnweber in Innsbruck.

The average age of the 86 patients included in this presentation was 61 and 65% of them were male. Nearly half of them were current or former smokers and 65% of hospitalised COVID-19 patients were overweight or obese. Eighteen (21%) had been in an intensive care unit (ICU), 16 (19%) had had invasive mechanical ventilation, and the average length of stay in hospital was 13 days.

A total of 56 patients (65%) showed persistent symptoms at the time of their six-week visit; breathlessness (dyspnoea) was the most common symptom (40 patients, 47%), followed by coughing (13 patients, 15%). By the 12-week visit, breathlessness had improved and was present in 31 patients (39%); however, 13 patients (15%) were still coughing

Tests of lung function included FEV1 (the amount of air that can be expelled forcibly in one second), FVC (the total volume of air expelled forcibly), and DLCO (a test to measure how well oxygen passes from the lungs into the blood). These measurements also improved between the visits at six and 12 weeks. At six weeks, 20 patients (23%) showed FEV1 as less than 80% of normal, improving to 18 patients (21%) at 12 weeks, 24 patients (28%) showed FVC as less than 80% of normal, improving to 16 patients (19%) at 12 weeks, and 28 patients (33%) showed DLCO as less than 80% of normal, improving to 19 patients (22%) at 12 weeks.

The CT scans showed that the score that defines the severity of overall lung damage decreased from eight points at six weeks to four points at twelve weeks. Damage from inflammation and fluid in the lungs caused by the coronavirus, which shows up on CT scans as white patches known as 'ground glass', also improved; it was present in 74 patients (88%) at six weeks and 48 patients (56%) at 12 weeks.

At the six-week visit, the echocardiograms showed that 48 patients (58.5%) had dysfunction of the left ventricle of the heart at the point when it is relaxing and dilating (diastole). Biological indicators of heart damage, blood clots and inflammation were all significantly elevated.

Dr Sahanic said: "We do not believe left ventricular diastolic dysfunction is specific to COVID-19, but more a sign of severity of the disease in general. Fortunately, in the Innsbruck cohort, we did not observe any severe coronavirus-associated heart dysfunction in the post-acute phase. The diastolic dysfunction that we observed also tended to improve with time."

She concluded: "The findings from this study show the importance of implementing structured follow-up care for patients with severe COVID-19 infection. Importantly, CT unveiled lung damage in this patient group that was not identified by lung function tests. Knowing how patients have been affected long-term by the coronavirus might enable symptoms and lung damage to be treated much earlier and might have a significant impact on further medical recommendations and advice."

In a second poster presentation to the Congress [3], Ms Yara Al Chikhanie, a PhD student at the Dieulefit Santé clinic for pulmonary rehabilitation and the Hp2 Lab at the Grenoble Alps University, France, said that the sooner COVID-19 patients started a pulmonary rehabilitation programme after coming off ventilators, the better and faster their recovery.

COVID-19 patient undergoing muscle training for rehabilitation

Patients with severe COVID-19 can spend weeks in intensive care on ventilators. The lack of physical movement, on top of the severe infection and inflammation, leads to severe muscle loss. The muscles for breathing are also affected, which weakens the breathing capacity. Pulmonary rehabilitation, which involves physical exercises and advice on managing symptoms, including shortness of breath and post-traumatic stress disorder, is crucial for helping patients to recover fully.

Ms Al Chikhanie used a walking test to evaluate the weekly progress of 19 patients [4] who had spent an average of three weeks in intensive care and two weeks in a pulmonary ward before being transferred to the Dieulefit Santé clinic for pulmonary rehabilitation. Most were still unable to walk when they arrived, and they spent an average of three weeks in rehabilitation. The walking test measured how far the patients could walk in six minutes. At the beginning, they were able to walk an average of 16% of the distance that, in theory, they should be able to walk normally if healthy. After three weeks of pulmonary rehabilitation, this increased to an average of 43%, which was a significant gain but still a serious impairment.

Ms Al Chikhanie said: "The most important finding was that patients who were admitted to pulmonary rehabilitation shortly after leaving intensive care, progressed faster than those who spent a longer period in the pulmonary ward where they remained inactive. The sooner rehabilitation started and the longer it lasted, the faster and better was the improvement in patients' walking and breathing capacities and muscle gain. Patients who started rehabilitation in the week after coming off their ventilators progressed faster than those who were admitted after two weeks. But how soon they can start rehabilitation depends on the patients being judged medically stable by their doctors. Despite the significant improvement, the average period of three weeks in rehabilitation wasn't enough for them to recover completely.

"These findings suggest that doctors should start rehabilitation as soon as possible, that patients should try to spend as little time as possible being inactive and that they should enrol with motivation in the pulmonary rehabilitation programme. If their doctors judge it to be safe, patients should start physical therapy exercises while still in the hospital's pulmonary ward."

Thierry Troosters, who was not involved in the study, is President of the European Respiratory Society and Professor in Rehabilitation Sciences at KU Leuven, Belgium. He said: "Anecdotal evidence has been emerging since the start of the COVID-19 pandemic that many patients suffer debilitating long-term after-effects from the coronavirus. Dr Sahanic's presentation is important because it is one of the first, comprehensive prospective follow-ups of these patients and shows the serious, long-term impact of COVID-19 on the lungs and heart. It is sobering to hear that more than half of the patients in this study showed damage to their lungs and hearts 12 weeks after hospital discharge, and that nearly 40% were still suffering from symptoms such as breathlessness. The good news, however, is that patients do improve and this surely will help the rehabilitation process, as discussed in the second presentation.

"Ms Al Chikhanie's research complements this information and shows how essential it is for patients to start pulmonary rehabilitation as soon as they are physically able to do so. This is why rehabilitation can also be started in the ward, if programmes are adapted to the capabilities of the patient. This is perfectly in line with a recent statement of our Society where we also advocate for tailored rehabilitation. It is clear from both these studies that rehabilitation, including physical and psychologic components, should be available for patients as soon as possible and it should continue for weeks if not months after they have been discharged from hospital in order to give patients the best chances of a good recovery. Governments, national health services and employers should be made aware of these findings and plan accordingly." [5]

###

[1] Abstract no: OA4143, "Persisting pulmonary impairment following severe SARS-CoV-2 infection, preliminary results from the CovILD study", by Sabina Sahanic et al; "Covering COVID - the best abstracts" session, 18.00 hrs CEST, Monday 7 September. https://k4.ersnet.org/prod/v2/Front/Program/Session?e=259&session=12607

[2] The severity score has a maximum scale of 25 points.

[3] Abstract no: PA938, "The weekly recovery of physical capacities in COVID-19 patients during post-extubation pulmonary rehabilitation" by Yara Al Chikhanie et al; "New insights into determinants of patient-reported outcomes in chronic respiratory diseases" E-poster session, online from Monday 24 August. https://k4.ersnet.org/prod/v2/Front/Program/Session?e=259&session=12283

[4] Two more patients have been added since the abstract with 17 patients was accepted for the congress.

[5] "COVID-19: Interim Guidance on Rehabilitation in the Hospital and Post-Hospital Phase from a European Respiratory Society and American Thoracic Society-coordinated International Task Force" by Martijn A.Spruit et al. European Respiratory Journal 2020; DOI:10.1183/13993003.02197-2020: https://erj.ersjournals.com/content/early/2020/07/30/13993003.02197-2020

Poetry in motion: Engineers analyze the fluid physics of movement in marine snails

Results could inspire novel bio-inspired underwater vehicles

FRONTIERS

Research News

    SHARE

 PRINT  E-MAIL

Volume 0%

 

VIDEO: CUVIERINA ATLANTICA, A THECOSOMATOUS PTEROPOD WITH AN ELONGATED SHELL view more 

CREDIT: DAVID MURPHY AND COAUTHORS 

In the world's oceans, billions of tiny marine snails (a form of plankton) commute daily between surface waters, where they feed at night, to depths of several hundred metres during the day to rest while avoiding predators. Marine snails play an important role in geochemical cycles and climate: 12-13% of the global carbonate flux occurs when the calcium carbonate shells of dead snails sink to the depths, where they dissolve and contribute to atmospheric carbon and ocean acidification. But because they are difficult to study and can't be kept in the laboratory, the behavior of these animals - which bear poetic names such as sea butterflies - is poorly known, especially for the subtropical and tropical regions where their diversity is greatest.

Here, a team of oceanographers and engineers who specialize in research at the intersection of fluid physics and biology, film the movements of tropical marine snails and analyze these both from a fluid physics and ecological perspective. They show that each species has a distinct style of swimming and sinking, beautiful to watch, depending on the shape of their shell (coiled, elongated, or round), body size, presence of flapping "wings", and speed. The smallest, slowest species have more difficulty swimming due to seawater being "stickier" and more viscous for them - in technical terms, with a lower "Reynolds number" - which affects the angle, trajectory, and stability of their movement.

"We wanted to answer how the swimming behavior of these beautiful animals is affected by their different shell shapes and sizes. We found that species with a shell shaped like an airplane wing swims faster and is more maneuverable than those with 'snail-like' coiled shells. Understanding the swimming ability of these animals is helping us better understand their ecological importance and distribution in the ocean. Further, as engineers, we hope to learn from the swimming style of these organisms to design a new generation of bio-inspired underwater vehicles," says corresponding author Dr David Murphy, Assistant Professor at the Department of Mechanical Engineering of the University of South Florida, Tampa, Florida.

Between 2017-2019, the researchers caught multiple individuals of nine species of marine snails (0.9-13.1 mm long) at night off Bermuda, including 7 species of thecosomatous pteropods ("sea butterflies"), one species of gymnosomatous pteropods ("sea angels", which lack a shell as adults), and one species of atlantid heteropods. They transported them to the laboratory, where they recorded their behavior in a salt-water aquarium with high-speed stereophotogrammetry, a technique that tracks movement in 3D with a pair of cameras. For each species, they calculated the absolute and normalized speed (relative to body length) during active swimming and passive sinking, the frequency of wing movement, the angle of descent during sinking, the tortuosity of the path of ascent during swimming, and the Reynolds number.

They show that each species has a distinct swimming pattern, generally ascending in a saw-toothed spiral at 12-114 mm/s, or 1-24 body lengths per second - corresponding to an average-sized human male swimming at up to 40 m per second. The snails sink at similar speeds, but in a straight line, at an angle of 4-30° relative to vertical.

"We conclude that the swimming and sinking behavior of these pelagic snails corresponds strongly with shell shape and size. Tiny snails with coiled shells swim more slowly whereas larger snails with bottle-shaped or wing-shaped shells swim faster because their larger sizes allow them to overcome the effects of water viscosity. However, swimming speed does not correlate with how far these animals migrate each day, which suggests that light and temperature levels and the presence of predators and prey also play a role. We also found that the sea butterfly with the wing-shaped shell uses its shell to 'hang-glide' downwards in order to slow its sinking," says Murphy.

To study each species' depth preferences, Murphy et al. further sampled large numbers of snails with a computer-operated net, called a Multiple Opening/Closing Net and Environmental Sensing System, 0-1000 m below the surface. They used machine learning (based on images) and ribosomal DNA barcoding to determine species. Based on these results, the researchers estimate that these species travel 50-300 m per day, in a daily vertical "commute" that takes a total of 1-3.7 h per day.

"It's absolutely mesmerizing to watch these tiny, delicate animals flap their wings in really complex motions in order to essentially fly through the water. We're lucky to have high speed cameras that can slow down this motion enough for us to see it. And it's stunning to think that these sea butterflies are using the same fluid dynamics principles to fly through water that insects use to fly through air," concludes Murphy.

###

 

African wild dogs have vestigial first digit and muscular adaptations for life on the run

Anatomists identify a vestigial first digit in the forelimb of the African wild dog and document anatomical adaptations to its unique lifestyle of long-distance running and exhaustive predation

PEERJ

Research News 

IMAGE: ILLUSTRATION OF THE MUSCLES AND BONES OF THE AFRICAN WILD DOG FOREARM. THE BONE LABELED "METACARPAL 1 " IS THE VESTIGIAL FIRST DIGIT. MUSCLES OF THE FOREARM ARE ADAPTED TO PROVIDE... view more 

CREDIT: ILLUSTRATIONS DRAWN BY BRENT ADRIAN OF MIDWESTERN UNIVERSITY (ONE OF THE CO-AUTHORS OF THE ARTICLE

African wild dogs have a vestigial first digit and muscular adaptations for life on the run

Anatomists identify a vestigial first digit in the forelimb of the African wild dog and document anatomical adaptations to its unique lifestyle of long-distance running and exhaustive predation

African wild dogs (Lycaon pictus) are known for their unique hunting style, often referred to as "exhaustive predation", in which they chase their prey to exhaustion, rather than hunting using speed, strength, or stealth. They are also unique among the dog clade in having only four full digits on their front paws. Until recently, it was unclear how these unique behavioral and anatomical features would affect their forelimb morphology.

The African wild dog, also known as the African painted dog or Cape hunting dog, is native to southern and eastern Africa, and classified as Endangered by the International Union for the Conservation of Nature (IUCN). They use sophisticated, coordinated hunting behaviors in which some packs decide as a group to hunt and communicate their vote via "sneezing". They also have a nomadic lifestyle with packs traveling up to 50 km per day and geographically extensive home ranges of 560 to 3000 km2. African wild dogs also differ from other canid (dog) species in the absence of a fully formed first digit (tetradactyly), which may allow for increased speed and stride length, facilitating long-distance pursuit of prey.

In a recent study published in PeerJ, a team of anatomists discovered a small, vestigial first metacarpal deep to the skin of the African wild dog. Surprisingly, this species is not fully tetradactyl as previously thought, but instead has a rudimentary digit 1. Prior to this study, the vestigial first digit of the African wild dog had never been described. The unexpected reduced digit results in a reconfiguration of some of the associated forelimb muscles to assist with proprioceptive functions (the body's perception of its own position and movement). According to Heather F. Smith, the study's lead author, "We now not only know that this vestigial digit exists, but how its presence completely reorganizes and repurposes the muscles typically associated with the first digit."

Illustration of the muscles and bones of the African wild dog forepaw. The bone labeled "metacarpal 1" is the vestigial first digit. The muscles attached to this bone are smaller and reorganized compared to other species and function to stabilize the wrist during long-distance running.

The authors have also discovered a stout ligament in the wrist which may act as a strut, assisting with passive flexion and rebound of the forefoot. This taut ligament provides non-muscular propulsion during push-off of the forepaw, which may help sustain endurance running and prevent the wrist muscles from tiring. This morphology is similar in function to the suspensory ligaments of the horse "spring foot", which provides passive "spring" action by absorbing and transferring forces experienced during locomotion.

Several other muscular adaptations to long-distance endurance running in the forelimb muscles have also been identified, including relatively reduced wrist rotator muscles and thick ligaments binding the radius and ulna (the two forearm bones), resulting in greater wrist and forearm stability. Several muscles associated with joint stability elastic energy storage during locomotion are also expanded compared to other species.

According to Smith, "This is the first in-depth study of African wild dog forelimb anatomy, and it demonstrates multiple adaptive mechanisms of endurance running, including reconfiguration of forelimb muscles, ligaments, and even bones, which function synchronously to facilitate the highly cursorial lifestyle of this fascinating species".

African Wild Dog, Lycaon pictus at Savuti Chobe National Park, Botswana.

The research team describing these discoveries includes Heather F. Smith, Brent Adrian, Ari Grossman, Rahul Koshy, and Ryan Alwiel from Midwestern University in Glendale, Arizona.

EMBARGOED until: 7th September 2020 at 7 am EST; 12 midday UK local time; 11 am GMT (i.e. the date of publication

Link to the Published Version of the article (quote this link in your story - the link will ONLY work after the embargo lifts): https://peerj.com/articles/9866/

Citation to the article:

Smith HF, Adrian B, Koshy R, Alwiel R, Grossman A (2020). Adaptations to cursoriality and digit reduction in the forelimb of the African wild dog (Lycaon pictus). PeerJ 8:e9986.

PeerJ is an Open Access publisher of seven peer-reviewed journals covering biology, environmental sciences, computer sciences, and chemistry. With an emphasis on high-quality and efficient peer review, PeerJ's mission is to help the world efficiently publish its knowledge. All works published by PeerJ are Open Access and published using a Creative Commons license (CC-BY 4.0). PeerJ is based in San Diego, CA and the UK and can be accessed at peerj.com

PeerJ - the Journal of Life and Environmental Sciences is the peer-reviewed journal for Biology, Medicine and Environmental Sciences. PeerJ has recently added 15 areas in environmental science subject areas, including Natural Resource Management, Climate Change Biology, and Environmental Impacts.

peerj.com/environmental-sciences

Across its journals, PeerJ has an Editorial Board of over 2,000 respected academics, including 5 Nobel Laureates. PeerJ was the recipient of the 2013 ALPSP Award for Publishing Innovation. PeerJ Media Resources (including logos) can be found at: peerj.com/about/press

 

Comprehensive look at US fuel economy standards show big savings on fuel and emissions

PRINCETON UNIVERSITY, ENGINEERING SCHOOL

Research News

IMAGE: THE GRAPH SHOWS VEHICLE MILES TRAVELED VERSUS FUEL CONSUMPTION FROM 1965 THROUGH 2018 IN THE UNITED STATES. WHILE TRAVEL INCREASED SIGNIFICANTLY DURING THAT TIME, FUEL USE DROPPED DUE, IN LARGE... view more 

CREDIT: GRAPH COURTESY OF THE RESEARCHERS (REBECCA CIEZ); REDESIGN BY BUMPER DEJESUS

In one of the first comprehensive assessments of the fuel economy standards in the United States, Princeton University researchers found that, over their 40-year history, the standards helped reduce reliance on foreign oil producers, cut greenhouse gas emissions, and saved consumers money.

Using data including household spending data, oil use, and greenhouse gas emissions, the researchers found that the standards (known as the CAFE standards), which were first enacted in 1975 as a way to reduce dependence on foreign oil after the oil crisis, set well-defined societal objectives and were cost-effective, fair, durable and adaptive. The standards required automakers to produce more efficient vehicles over time, increasing the number of miles per gallon required of their vehicle fleets. The researchers cite that the standards saved $5 trillion in fuel costs and prevented 14 billion metric tons of carbon from being released into the atmosphere, the equivalent of the United States eliminating all emissions from all sectors for nearly three years.

"It has been one of the most effective policies to date," said Judi Greenwald, a co-author of the study, former top U.S. Department of Energy official and non-resident fellow at the Princeton University's Andlinger Center for Energy and the Environment.

The paper, coauthored by Greenwald, Rebecca Ciez and David Greene, was published on August 23 in the journal Energy Policy. Ciez was a Distinguished Postdoctoral Fellow at the Andlinger Center and Greene is a research professor in the Department of Civil and Environmental Engineering at the University of Tennessee, Knoxville. Ciez has accepted a position as assistant professor in mechanical engineering and environmental and ecological engineering at Purdue University.

"There really hasn't been any comprehensive lookback to day one of the standards to consider what their impacts have been, how they changed over time, whether the potential threats to their effectiveness materialized or not, and their overall impact," said Greene.

The researchers noted that the policies helped, in part, to keep the rate of yearly growth in U.S. gasoline consumption to 0.2% since 1975. The policy, in addition to fluctuations in gas prices, reduced oil imports and saved 2 trillion gallons of gasoline, enough to fuel all the light-duty vehicles in the United States for fifteen years.

"These standards have been remarkably effective from both an environmental perspective and an energy security perspective, and most people don't realize it," said Greenwald.

The authors said these types of regulations are more effective at improving fuel economy than other policy tools, like a gasoline tax, because they don't rely on the consumer to make the long-term fuel-efficient choice and, therefore, gain cost benefits at the pump. The fuel economy standards move the calculation to regulators and require that manufacturers improve fuel economy across their product lines using technologies that may cost a little more but save consumers much more on fuel in the long run.

A prior study by Greene found that over the lifetime of the policy, the technology for efficiency upgrades increased the cost of cars by an average of $4,800, but yielded $16,000 in savings for consumers at the pump.

Dan Sperling, founding director of the Institute of Transportation Studies at the University of California, Davis, who is unaffiliated with the study, called it an "important and authoritative history and analysis." "There is nothing like this in the literature," said Sperling, who is also the Distinguished Blue Planet Prize Professor of Civil Engineering and Environmental Science and Policy at UC, Davis and a member of the California Air Resources Board.

Greenwald said the standards have evolved in ways that continue to benefit and serve the public and have endured various administrations and political tides. It is a testament to their initial design, as well as regulators' adaptive responses to changing circumstances over time. In 2010, two sets of vehicle standards affecting automakers, one for greenhouse gas emissions and one for fuel efficiency, were harmonized so that manufacturers could meet one set of standards when designing new vehicles.

The analysis concludes with a recommendation to continue to increase the stringency of the standards based on the best available data and analysis, as regulators have done historically. The most recent rules promulgated by the Trump administration aim to loosen the fuel efficiency requirements by dropping the annual efficiency increase from five percent to one and a half percent through 2026. Given that transportation is the largest source of U.S. greenhouse gas emissions (GHG) and that people keep their cars for approximately 10 years, this would severely stymie environmental progress, the researchers said. The Rhodium Group, an independent research organization unaffiliated with the study, estimates that the policy change would achieve only one fifth of greenhouse gas reductions that the Obama-era policy would achieve.

Ciez pointed to the 1990s as an example of what can happen when fuel targets are effectively frozen. She said it led automakers to produce bigger, faster, and more polluting cars. Gas prices were cheap and gas-guzzling vehicles hit the road in mass numbers. Car companies made SUVs and vehicles with quicker acceleration times, which became very popular among American drivers. Ciez said without the standards, there is little incentive for automakers to focus on fuel economy as opposed to horsepower or vehicle comfort. The standards have spurred technological innovation, allowing cars to provide all three attributes - power, comfort, and efficiency - at a reasonable cost.

Regardless of the what happens over the next four years, Sperling said, the authors have provided "a model for assessing other policies."

In the closing statement the authors contextualized this moment in history.

"It is likely that the United States is in the middle, not the end, of the story of the adaptive response of the vehicle CAFE and GHG standards."

###

 

Warning: Epidemics are often followed by unrest

From the Black Death to the Spanish Flu, history teaches that social tension accumulated over an epidemic can lead to significant episodes of rebellion, according to a study by Massimo Morelli and Roberto Censolo

BOCCONI UNIVERSITY

Research News

IMAGE: MASSIMO MORELLI, BOCCONI UNIVERSITY view more 

CREDIT: PAOLO TONATO

If you have not been hearing much of the French Gilets Jaunes or of the Italian Sardines in the last few months, it's because "the social and psychological unrest arising from the epidemic tends to crowd-out the conflicts of the pre-epidemic period, but, at the same time it constitutes the fertile ground on which global protest may return more aggressively once the epidemic is over," writes Massimo Morelli, Professor of Political Science at Bocconi, in a paper recently published in Peace Economics, Peace Science and Public Policy.

Professor Morelli and Roberto Censolo (University of Ferrara) argue that we can get an informed opinion about the possible effects of COVID-19 on protest and future social unrest by looking at the great plagues of the past, so they analyze 57 epidemic episodes between the Black Death (1346-1353) and the Spanish Flu (1919-1920). They state that while the epidemic lasts the status quo and incumbent governments tend to consolidate, but warn that a sharp increase in social instability in the aftermath of the epidemic should be expected.

Revolts not evidently connected with the disease are infrequent within an epidemic period, but epidemics can sow other seeds of conflict. Government conspiracy, "the filth of the poor", foreigners and immigrants have often been singled out as the cause of an epidemic. "Overall, the historical evidence shows that the epidemics display a potential disarranging effect on civil society along three dimensions," the authors write. "First, the policy measures tend to conflict with the interest of people, generating a dangerous friction between society and institutions. Second, to the extent that an epidemic impacts differently on society in terms of mortality and economic welfare, it may exacerbate inequality. Third, the psychological shock can induce irrational narratives on the causes and the spread of the disease, which may result in social or racial discrimination and even xenophobia." Focusing on five cholera epidemics, Morelli and Censolo count 39 rebellions in the 10 years preceding an epidemic and 71 rebellions in the 10 years following it.

On the other hand, the authors note that, in the short-term, the necessary restrictions of freedom during an epidemic may be strategically exploited by governments to reinforce power.

Roberto Censolo, Massimo Morelli, "COVID-19 and the Potential Consequences for Social Stability", in Peace Economics, Peace Science and Public Policy, published online ahead of print, DOI: 10.1515/peps-2020-0045.

THE SCIENTIFIC PROOF FOR 

DIALECTICAL MATERIALISM

Germany: Right-wing extremists dominate anti-virus protests
2020/9/6

©Deutsche Presse-Agentur GmbH

Germany: Right-wing extremists dominate anti-virus protests - A man holds up the German imperial flag during a demonstration against coronavirus measures. Right-wing extremists gave speeches at 90 demonstrations protesting against measures to contain the coronavirus this year, according to Germany's domestic security agency. - Fabian Sommer/dpa

Right-wing extremists gave speeches at 90 demonstrations protesting against measures to contain the coronavirus this year, according to Germany's domestic security agency.

In recent months, the country has seen major demonstrations and rallies against regulations introduced to prevent the spread of the virus.

In late August, tens of thousands of people gathered in Berlin to demonstrate against health measures, protesting against what they called "coronavirus dictatorship" and "corona madness."

Among them were groups of self-declared Reichsbuerger (Reich citizens), who deny the legitimacy of the modern-day German state, chanting and carrying posters and leaflets. There were also smaller groups of neo-Nazis and right-wing extremists.

Members of the far-right Alternative for Germany party have also been seen at the rallies and protests.

While large gatherings in Berlin have captured headlines, regionally, the eastern state of Saxony Anhalt saw the most protests with right-wing speakers, the security agency said. The eastern state saw more than a third of the protests dominated or led by right wingers from April 25 to August 10.

The agency noted there had also been two protests in the western cities of Essen and Dusseldorf in July, with several hundred people gathering to oppose government health measures.

Often, such protests were not registered by organizations but by individuals, the agency said. Some were not registered in advance at all.

The agency provided the figures in response to a question posed by the Left Party parliamentary group.

A MUSICAL INTERLUDE WITH PINK MARTINI LIVE IN STUTTGART 2010