Saturday, May 23, 2020

George Soros says Europe should tap up an obscure bond used during the Napoleonic Wars to save itself from a coronavirus depression

Saloni Sardana May. 22, 2020, BUSINESS INSIDER 
FABRICE COFFRINI/AFP/Getty Images


Hedge fund veteran George Soros says Europe should introduce so-called perpetual bonds — bonds that have no maturity — to help finance the response to the economic impact of the coronavirus.

With a perpetual bond, the principal, or the amount that is borrowed, is never paid back, and the borrower only repays the interest on the bond.

Such bonds have been issued during times of crisis before, Soros said, noting that the UK issued perpetual bonds during the Napoleonic Wars.

Soros' suggestion comes days after France and Germany proposed a €500 billion ($545 billion) billion recovery fund for the EU which would be funded by grants.

Soros said the EU needs to maintain an AAA rating or else bonds will be "unsaleable". 


Billionaire hedge-fund founder George Soros thinks Europe can help solve the economic crisis driven by the coronavirus by issuing so-called perpetual bonds, a little used form of bond that has no maturity or end date.

These bonds, also called consols or perpetual bonds, are unique because the principal — the amount borrowed — is never paid back, and only interest is paid by the issuing party. They must, however, pay that interest in perpetuity.

They've previously been used in times of crisis by governments around the world to fund things like wars.



Soros thinks they could be a handy way of helping governments deal with the economic fallout of the pandemic, which has locked down virtually the whole continent, seen businesses disappear, and millions become unemployed.

In a transcript of a De Telegraaf interview emailed to reporters, the hedge fund veteran and founder of Soros Fund Management said: "They [consols] have a long history in both countries. In the UK they were used, among other things, to finance the wars against Napoleon and to finance the First World War. In the US they were introduced in the 1870s."
How consols work

Soros warns that these bonds should not be mistaken with emergency coronavirus bonds, and pose a more elegant solution to the funding problems faced by European governments.

"The principal amount of a perpetual bond never has to be repaid; only the annual interest payments are due. A €1 trillion ($1.09 trillion) bond would cost €5 billion ($5.45 billion) a year, assuming an interest rate of 0.5%," he said.

Consols do not need to be sold all at once, they can be issued in tranches and can be sold by long-term investors, he said.

"As the markets familiarize themselves with the new instruments, later tranches would attract a larger set of buyers and eventually the bonds would fetch a premium," he added.

Soros said: "Unfortunately, my suggestion for perpetual bonds has been confused with "corona bonds" and this has poisoned the debate."

"The two have nothing to do with each other. Corona bonds have been decisively rejected, and with good reason, given that they require a degree of mutualization that is simply not acceptable."

The corona bonds mentioned by Soros are a set of mutualized bonds proposed by numerous European Union nations that would be jointly issued by the European Investment Bank. Spain, Italy, France are among those who have suggested the bonds.

How it's different from the recovery fund France, Germany proposed


Fine Art / Getty Images

France and Germany, the eurozone's two biggest economies proposed a €500 billion ($545 billion) coronavirus recovery fund this week.

It was heralded by one analyst as a modern day equivalent of the Marshall plan, the post-World War II economic package designed to save the European economy, according to analysts.

But it was based on issuing grants instead of loans, meaning that those given money would never have to pay it back.

Soros is suggesting the opposite.


"That is why I now speak about "consols." The only mutual obligation is the payment of the annual interest, which is negligible. €5 billion ($5.4 billion) annually secures an urgently required €1 trillion ($1.09 trillion) – an amazingly low cost/benefit ratio of 1:200!" he said.
What the EU needs to do before it can issue perpetual bonds

Soros said that the EU needs to maintain an AAA rating in order for consols to work, otherwise the bonds will be "unsaleable."

"That requires the EU to have what is called sufficient 'own resources' – taxes that can be levied to cover the cost of servicing the bonds."

As imposing taxes can be a long-winded process, Soros said taxes will only need to be authorized not implemented.

"The European Union is particularly vulnerable because it is based on the rule of law and the wheels of justice turn proverbially slowly. By contrast the coronavirus moves very fast and in unpredictable ways," Soros said.

"Issuing bonds whose cost/benefit ratio is 1:200 opens up an amazing amount of fiscal space. The money raised does not have to be distributed according to the so-called fiscal key, i.e. member states' shareholding in the ECB. It can be allocated to those in the greatest need."

The EU Commission is expected to propose its own blue print on May 27, but it could be months before any stimulus package is approved and enacted.
Hedge funds are piling into healthcare stocks at record levels, Goldman Sachs says

THE BEST HEALTHCARE MONEY CAN BUY


Ben Winck May. 22, 2020
Ramin Talaie/Corbis/Getty Images


Hedge fund positioning in healthcare stocks reached a record 10 percentage points overweight compared to the Russell 3000 index, Goldman Sachs said Friday.
The rotation was primarily fueled by soaring interest in biotech names. Recent weeks have seen investors pile into companies racing to introduce the first coronavirus treatment.
Positioning has grown more crowded both within and across funds in the second quarter, Goldman added, as managers rotate even further toward growth stocks and defensive plays.


Hedge funds are reaching record levels of exposure to healthcare stocks as the coronavirus pandemic rages on, Goldman Sachs said Friday.

The sector sits 10 percentage points overweight across hedge funds compared to the Russell 3000 sector, the bank added, making it the most favored industry among managers. Funds monitored by Goldman are nearly 25% concentrated in healthcare equities, with tech companies following with a 20% weighting.

Biotech stocks have been the biggest beneficiary and reached a 2.8 percentage point overweight through the start of the second quarter. The shift has come at a time where investors are rewarding companies working towards COVID treatments. Moderna, Gilead, and Sorrento Therapeutics have all skyrocketed in recent sessions after boasting positive results in their efforts to produce a coronavirus treatment.

Investors' optimism accelerated hedge fund inflows to the sector, Goldman said in a note, helping cement it as one of the best performers year-to-date.

The stock market's wild moves through the year have also driven greater concentration within fund portfolios, the team led by Ben Snider wrote. The start of the second quarter already featured historically high weighting in growth stocks and defensive industries, and recent weeks pushed even more fund cash into popular mega-caps including Amazon and Microsoft.

The average fund now holds 71% of its portfolio in its top 10 stakes, just one percentage point below the record high set in 2019, according to Goldman.

Commonality across fund holdings has also soared. The firm's crowding index matches the record high set in the first quarter of 2016. The heavy interest in growth over value stocks helped push Goldman's Hedge Fund VIP basket to a record high in both absolute terms and relative to the S&P 500.



Trump just declared houses of worship essential. Mounting evidence shows they're super-spreader hotspots.

Aylin Woodward BUSINESS INSIDER MAY 22, 2020
A woman sings during an Easter Sunday service at the Friendship Baptist Church in Baltimore, Maryland. ALEX EDELMAN/AFP via Getty Images

President Trump designated churches and other houses of worship as essential services on Friday.

There have been multiple reports of super-spreader events at US churches and synagogues, as well as a South Korean temple.

During these events, an infected person passed the coronavirus to an unusually high number of others, sparking local outbreaks.

The CDC warns that large indoor gatherings, particularly church events, can be potential disease hotspots.

President Donald Trump just declared in-person worship an essential service.

"I call upon governors to allow our churches and places of worship to open right now," he said during a Friday announcement at the White House. Trump added that he wouldn't hesitate to "override" state governors that refused to comply.

Although many people want to return to houses of worship, especially during a scary and stressful time, mounting evidence shows these places to be among the riskiest for coronavirus spread.

Clusters of infections can often be traced back to a super-spreader event, in which one person infects an atypically large number of people. So far, these events have shared a few key characteristics: They've mostly been indoors and put lots of people from different households in close, extended contact. That's precisely the type of gathering that churches, mosques, and synagogues facilitate.


"You can't have a super-spreading event unless there are a lot of people around, so you have to be very careful still about gatherings of people of any size — that includes religious services," William Schaffner, an infectious-disease expert from Vanderbilt University, told Business Insider.
Parishioners wear face masks as they attend an in-person Mass at Christ the King Catholic Church in San Antonio, Texas, on May 19, 2020. Eric Gay/AP Photo
"The virus doesn't respect any religions," he added. 

Houses of worship are coronavirus transmission hotspots

Research has found time and again that the risk of coronavirus transmission is much higher indoors, in poorly ventilated spaces where lots of people have sustained contact. That's because it primarily spreads via droplets that fly through the air when an infected person coughs, sings, talks, or sneezes.

"Any gathering, from the point of view of the virus, is ideal," Schaffner said. "People congregate, hug each other, exchange stories, and thank you very much, the virus is going to go from me to you."

A recent study found that talking loudly can produce enough droplets to transmit the coronavirus, and that those droplets could linger in the air for at least eight minutes. Vigorous singing, too, has been linked to the virus' spread.

That's what makes religious services dangerous. Trump indicated that it's up to religious leaders to minimize these risk factors.

"Ministers, pastors, rabbis, and imams and other faith leaders will make sure their congregations are safe as they gather and pray," Trump said on Friday. "They love their congregations, they love their people, they don't want anything bad to happen to them or to anyone else."
President Trump speaks with reporters about the coronavirus at the White House, May 22, 2020. Alex Brandon/AP


Super-spreader events at churches and a synagogue


In early March, a 57-year-old Arkansas pastor and his wife attended church events and a bible study group a few days before they developed coronavirus symptoms.


Of the 92 people they came into contact with at the church, 35 got sick. Seven had to be hospitalized. Three died.

Contact tracers from the Arkansas Department of Health then discovered 26 more cases and one other death among people who reported contact with the churchgoers. According to a recent CDC report chronicling that super-spreader event, "group gatherings during church events" could be a source of widespread coronavirus transmission.

"These findings underscore the opportunity for faith-based organizations to prevent COVID-19 by following local authorities' guidance," the authors wrote.

A man wears a face mask as he walks near Young Israel orthodox synagogue in New Rochelle, New York. Eduardo Munoz/REUTERS

The story of Lawrence Garbuz, the 50-year-old attorney from New York's Westchester County, underscores that point.


Garbuz was hospitalized with the virus in late February, and was among the state's first confirmed cases. A week later, New York had confirmed another 170 cases, including Garbuz's wife and two children.

Most of those cases were linked to him. The neighbor who drove Garbuz to the hospital got sick, as did the rabbi from his local synagogue and many congregants he'd interacted with during a bat mitzvah and a birthday party.

According to the CDC, houses of worship might therefore facilitate coronavirus transmission "beyond household contacts into the broader community."

That's also what happened in Chicago in February, when a person with not-yet-diagnosed coronavirus attended a birthday party. There, the individual sickened seven others, three of whom then attended church services a week later and infected at least one other person.

A super-spreader at a South Korean church infected 43 others

A person sick with the coronavirus can infect two to 2.5 other people on average, according the World Health Organization. But super-spreader events lead individuals to buck that average.

In mid-February, a 61-year-old woman attended church services at the Shincheonji Church of Jesus on February 9 and 16 in Daegu, South Korea. Soon after, she tested positive for the coronavirus — then so did dozens of others. South Korea's coronavirus case count quickly jumped from 29 cases on February 15 to more than 2,900 two weeks later.
Workers from a disinfection service company sanitize a branch of the Shincheonji Church of Jesus, where a woman with the coronavirus attended a service in Daegu, South Korea. Reuters

The 61-year-old super-spreader, dubbed "Patient 31," may have infected at least 43 people after she attended services, authorities said. Followers of the fringe religious faction were asked to remove protective masks to pray.

The super-spreader label, therefore, doesn't necessarily indicate that a person is more contagious than others, or that they're shedding more viral particles. Rather, they have access to a greater number of people in spaces that facilitate infection. A 2011 study found that a small percentage of a population — 20% — was responsible for 80% of disease transmission during an outbreak.

Madagascar copal: New dating for an Antropocene ancient resin

This material is not a semi-fossilized resin
UNIVERSITY OF BARCELONA
IMAGE
IMAGE: THE STUDY STATES THAT THE WELL-KNOWN MADAGASCAR COPAL IS NOT A SEMI-FOSSILIZED RESIN BUT A MATERIAL MADE DURING THE ANTROPOCENE. view more 
CREDIT: XAVIER DELCLÒS (UNIVERSITY OF BARCELONA-IRBIO)
The known Madagascar copal is a more recent resin from what was thought -it has about a few hundred years- and trapped pieces in this material are not as palaeontological important as thought traditionally. This is one of the conclusions of the new article in the journal PLOS ONE, whose first author is Xavier Delclòs, professor at the Faculty of Earth Sciences and member of the Biodiversity Research Institute (IRBio) of the University of Barcelona.
The study states that the well-known Madagascar copal is not a semi-fossilized resin but a material made during the Antropocene, historical period in which human impact was extreme globally. The findings would require going over the described taxon during the last hundred and fifty years to avoid taxonomic mistakes and unprecise paleoenvironmental reconstructions, the study notes.
Other participants in this study, the first to describe the oldest age and geographical origin of the Madagascar copal, are Enrique Peñalver, from the Spanish Geological and Mining Institute (IGME), Voajanahary Ranaivosoa, from the University of Antananarivo (Madagascar) and Mónica M. Solórzano Kraemer, from the Senckenberg Research Institute (Frankfurt, Germany).
From Tanzania coasts to Indian markets
Known for hundreds of years, the Madagascar copal crossed the trade routes from Tanzania to China through the Indian Ocean and the Indian markets. Sold as incense at first, it became pricey due to its high value to make varnish. More recently, it was used as disinfectant -burnt in Madagascar houses- and it was sold to scientists and tourists for its high content of arthropods inside.
This ancient resin which was not completely fossilized comes from Hymenaea verrucosa trees, a fabacean that grows in the eastern coast of Madagascar, one of the most threatened and fragile ecosystems in the world.
Wrong dating for an ancient resin
According to the study, the scientific community studied the biological remains inside the copal, named bioinclusions, and dated these findings from a few tens to millions of years. However, the origin of the studied material was never found -it is not cited in any study-, and the exact age of the studied pieces was never proved.
"The correct dating of the copal, as an important factor for a planetological study, can influence all the following paleo-biological studies, such as those related to phylogeny, paleobiogeography, and paleoclimatology", notes Professor Xavier Delclòs, from the Department of Earth and Ocean Dynamics of the UB.
According to the study, some found species in the Madagascar copal -thought to be extinct- could be now in forest habitats that were not considered to be their natural habitats. This can explain the occasional presence of arthropod species inside this old resin and which are currently living in the area.
The study notes that any new described taxon after the Madagascar copal should be attached the dating of Carbon-14 for the studied sample (at least, the sample including the main piece or holotype). Also, museums with Malagasy copal specimen pieces should review the dating with the Carbon-14 system.
An Anthropocene resin to protect Malagasy biodiversity
The loss of biodiversity during the Anthropocene is a threat in different areas of the planet, especially in warm areas of biodiversity such as the island of Madagascar. This study shows the scientific value of the Madagascar copal as a source of biological and paleobiological information to study the loss of biodiversity during the Anthropocene in Malagasy areas which are important areas of threatened biodiversity.
"The Madagascar copal is a file of great scientific interest. It represents a part of the Malagasy biodiversity and ecosystem during historical periods and can contain extinct species due to the high rate of deforestation in the Red Island over the last three hundred years", note the authors. "If this intense deforestation continues at the current rate, it is likely for the preserved species in the resin of Hymenaea trees -together with historical entomological collections- to become the only knowledge reservoirs to do research on a part of the entomofauna of fragile tropical forests of Madagascar lowlands", conclude researchers.
###

The European viper uses cloak-and-dazzle method to escape predators

The European viper uses cloak-and-dazzle to escape predators
The viper's zig-zag pattern helps the snake remain undetected, it also provides a warning of the snake's dangerous defense and it can produce an illusionary effect that may hide the snake's movement as it flees. Credit: The University of Jyväskylä/Janne Valkonen
A study by researchers at the University of Jyväskylä demonstrate that the characteristic zig-zag pattern on a viper's back performs seemingly opposing functions during a predation event. At first, the zig-zag pattern helps the snake remain undetected. But upon exposure, it provides a conspicuous warning of the snake's dangerous defense. Most importantly the zig-zag can also produce an illusionary effect that may hide the snake's movement as it flees. The research, published in Animal Behaviour (2020), reveals how a single color pattern can have multiple effects during a predation event, thereby expanding the discussion on protective coloration and anti-predator adaptations.
Protective coloration is one of the simplest but most effective tools that prey species use to evade predators. Typically, different color patterns are useful at different stages of a predation event. Some color patterns are cryptic, obscuring the prey from being detected—think chameleons. Other patterns are aposematic, which blatantly advertise a warning to predators—think wasps. Finally, some patterns can produce  to startle or confuse predators and give the prey an escape opportunity—think zebras.
But a recent series of experiments, by a team headed by Janne Valkonen and Johanna Mappes at the University of Jyväskylä (Finland), suggests that European vipers (Vipera sp.) can achieve all three tricks with a single color pattern—their characteristic zig-zag.
At first, the zig-zag pattern helps the viper to hide. The researchers hid plasticine models of snakes with different color patterns along paths and noted how often they were detected by people walking the trail. Models with the zig-zag pattern were detected less often than plainly colored models. This is the first confirmation that the viper's zig-zag pattern provides a cryptic function. But even if the viper is detected, the zig-zag can still work its magic—instead of hiding the , the pattern now functions to make it more obvious. Previous research has already established that the pattern warns predators about the snake's dangerous bite.
The rapid flickering from the zigs and zags of a fleeing snake can produce a a 'flicker-fusion effect' to mammalian predators
The most significant contribution from Dr. Janne Valkonen's study deals with a particular class of illusion generated by the zig-zag pattern. Just as a rapid series of still pictures can produce a smooth animation, the rapid flickering from the zigs and zags of a fleeing snake can produce the appearance of a solid shape.
The team measured the speed of fleeing snakes and calculated the flicker rate of the zig-zag. To an observer, a rapidly changing stimulus (such as a moving zig-zag, or spinning helicopter blade) is perceived as continuous if the flicker rate exceeds a threshold in the visual system.
The researchers found that the zig-zag moved quickly enough to produce such a flicker-fusion effect to mammalian predators, although the quicker eyes of a raptor weren't fooled. The effect of this illusion may change the appearance of the moving snake, making it harder to catch. So like a skilled illusionist, the viper hides by revealing.
The viper's zig-zag seems to be a simple pattern, but it is a masterful illusion that can hide, reveal, and paradoxically achieve both at the same time. Similarly, this research resolves theoretical tensions between apparently opposing functions of color patterns—that is, crypsis and aposematism seem mutually exclusive: One is meant to blend an animal into its surroundings, the other to make it stand out.
However, through the magic of movement and optics, both functions can be gained through the same pattern at different stages in the predation sequence. Furthermore, the one-to-many aspect of the zig-zag to its antipredator functions implies a far broader scope for the evolution of color patterns and antipredator adaptations than simple one pattern-to-one function relations.Toad disguises itself as deadly viper to avoid attack

More information: Janne K. Valkonen et al, Protective coloration of European vipers throughout the predation sequence, Animal Behaviour (2020). DOI: 10.1016/j.anbehav.2020.04.005
Journal information: Animal Behaviour 
227 shares

US regulators approve new type of contraceptive gel

US regulators approve new type of contraceptive gel
This May 2020 photo shows Phexxi, a contraceptive made by San Diego-based Evofem Bioscience. The Food and Drug Administration on Friday, May 22, 2020 approved the new contraceptive. (Christine Blackburne via AP)
U.S. regulators on Friday approved a birth control gel that works in a new way to prevent pregnancy.
Phexxi—pronounced FECK'-see—comes in an applicator that women insert before intercourse. The gel made by San Diego-based Evofem Biosciences contains  and potassium bitartrate, all of which are common food additives.
The new gel has some similarities to spermicides, which block the entrance to the cervix and slow sperm down. But Phexxi works differently.
The vagina's pH—a measure of acidity—is usually in the range of 3.5 to 4.5, the level needed to maintain healthy bacteria. Sperm typically raise that to a more hospitable level of 7 to 8. Phexxi keeps it in the usual acidic range, killing the sperm.
Unlike some other contraceptives, it only needs to be taken shortly before sex and it doesn't contain hormones, which can cause side effects some women can't tolerate.
The company said Phexxi will have a list price of $250 to $275 for a box of 12 without insurance.
In a study of 1,400 women aged 18 to 35, Phexxi was about 86% effective on average over seven menstrual cycles and a total of more than 34,000 acts of intercourse. That's a bit better than condoms, spermicides and other on-demand contraceptives.
The Food and Drug Administration approved Phexxi only as a contraceptive, but Evofem said its testing indicates the gel also reduces the risk of infection by gonorrhea and chlamydia. The company plans to start a large patient study by year's end, then submit results to the agency for approval as a second product, for preventing those infections.
Evofem would market it under a different name, and likely could tout Phexxi as both  and a way of helping to help prevent at least some sexually transmitted diseases.

Supercomputer model simulations reveal cause of Neanderthal extinction

INSTITUTE FOR BASIC SCIENCE
IMAGE
IMAGE: COMPUTER SIMULATIONS OF POPULATION DENSITY OF NEANDERTHALS (LEFT) AND HOMO SAPIENS (RIGHT) 43,000 YEARS AGO (UPPER) AND 38,000 YEARS AGO (LOWER). ORANGE (GREEN) CIRCLES INDICATE ARCHEOLOGICAL SITES OF NEANDERTHALS (HOMO... view more 
CREDIT: IBS
Climate scientists from the IBS Center for Climate Physics discover that, contrary to previously held beliefs, Neanderthal extinction was neither caused by abrupt glacial climate shifts, nor by interbreeding with Homo sapiens. According to new supercomputer model simulations, only competition between Neanderthals and Homo sapiens can explain the rapid demise of Neanderthals around 43 to 38 thousand years ago.
Neanderthals lived in Eurasia for at least 300,000 years. Then, around 43 to 38 thousand years ago they quickly disappeared off the face of the earth, leaving only weak genetic traces in present-day Homo sapiens populations. It is well established that their extinction coincided with a period of rapidly fluctuating climatic conditions, as well as with the arrival of Homo sapiens in Europe. However, determining which of these factors was the dominant cause, has remained one of the biggest challenges of evolutionary anthropology.
To quantify which processes played a major role in the collapse of Neanderthal populations one needs to use mathematical models that can realistically simulate the migration of Neanderthals and Homo sapiens, their interactions, competition and interbreeding in a changing climatic environment. Such models did not exist previously.
In a new paper published in the journal Quaternary Science Review, Axel Timmermann, Director of the IBS Center for Climate Physics at Pusan National University, presents the first realistic computer model simulation of the extinction of Neanderthals across Eurasia (Figure 1). The model which is comprised of several thousands of lines of computer code and is run on the IBS supercomputer Aleph, solves a series of mathematical equations that describe how Neanderthals and Homo sapiens moved in a time-varying glacial landscape and under shifting temperature, rainfall and vegetation patterns. In the model both hominin groups compete for the same food resources and a small fraction is allowed to interbreed. The key parameters of the model are obtained from realistic climate computer model simulations, genetic and demographic data.
"This is the first time we can quantify the drivers of Neanderthal extinction," said Timmermann. "In the computer model I can turn on and off different processes, such as abrupt climate change, interbreeding or competition" he said. By comparing the results with existing paleo-anthropological, genetic and archeological data (e.g. Figure 1), Timmermann demonstrated that a realistic extinction in the computer model is only possible, if Homo sapiens had significant advantages over Neanderthals in terms of exploiting existing food resources. Even though the model does not specify the details, possible reasons for the superiority of Homo sapiens could have been associated with better hunting techniques, stronger resistance to pathogens or higher level of fecundity.
What exactly caused the rapid Neanderthal demise has remained elusive for a long time. This new computer modeling approach identifies competitive exclusion as the likely reason for the disappearance of our cousins. "Neanderthals lived in Eurasia for the last 300,000 years and experienced and adapted to abrupt climate shifts, that were even more dramatic than those that occurred during the time of Neanderthal disappearance. It is not a coincidence that Neanderthals vanished just at the time, when Homo sapiens started to spread into Europe" says Timmermann. He adds "The new computer model simulations show clearly that this event was the first major extinction caused by our own species".
A research team at the IBS Center for Climate Physics is now improving the computer model to also include megafauna and implement more realistic climate forcings. "This is a new field of research in which climate scientists can interact with mathematicians, geneticists, archeologists and anthropologists", said Axel Timmermann.
###
Disclaimer: AAAS and EurekAlert! are not responsible f

Bumblebees speed up flowering by piercing plants


Bumblebees speed up flowering
If bumblebees find too little pollen, they pierce the leaves of non-flowering plants in order to force them to produce flowers more quickly. Credit: Hannier Pulido / ETH Zurich
When pollen is in short supply, bumblebees damage plant leaves in a way that accelerates flower production, as an ETH research team headed up by Consuelo De Moraes and Mark Mescher has demonstrated.
Spring has sprung earlier than ever before this year, accompanied by temperatures more typical of early summertime. Many plants were already in full bloom by mid-April, about three to four weeks earlier than normal. These types of seasonal anomalies are becoming increasingly frequent due to , and the resulting uncertainty threatens to disrupt the timing of mutualistic relationships between plants and their .
A research team led by ETH Professors Consuelo De Moraes and Mark Mescher has now discovered that one peculiar  behavior may help to overcome such challenges by facilitating coordination between the bees and the plants they pollinate. The group has found that bumblebee workers use their mouth parts to pinch into the leaves of plants that haven't flowered yet, and that the resulting damage stimulates the production of new flowers that bloom earlier than those on plants that haven't been given this "nudge."

Credit: ETH Zurich

Their study has just been published in the journal Science. "Previous work has shown that various kinds of stress can induce plants to flower, but the role of bee-inflicted damage in accelerating  was unexpected," Mescher says.
Surprising behavior from bumblebees
The researchers first noticed the behavior during other experiments being undertaken by one of the authors, Foteini Pashalidou: pollinators were biting the leaves of test plants in the greenhouse. "On further investigation, we found that others had also observed such behaviors, but no one had explored what the bees were doing to the plants or reported an effect on flower production," Mescher explains.
Following up on their observations, the ETH researchers devised several new laboratory experiments, and also conducted outdoor studies using commercially available bumblebee colonies—typically sold for the pollination of agricultural crops—and a variety of plant species.

Bumblebees speed up flowering
A bumblebee pierces a leaf with its tongue. Credit: Hannier Pulido / ETH Zurich
Based on their lab studies, the researchers were able to show that the bumblebees' propensity to damage leaves has a strong correlation with the amount of pollen they can obtain: Bees damage leaves much more frequently when there is little or no pollen available to them. They also found that damage inflicted on plant leaves had dramatic effects on flowering time in two different plant species. Tomato plants subjected to bumblebee biting flowered up to 30 days earlier than those that hadn't been targeted, while mustard plants flowered about 14 days earlier when damaged by the bees.
"The bee damage had a dramatic influence on the flowering of the plants—one that has never been described before," De Moraes says. She also suggests that the developmental stage of the plant when it is bitten by bumblebees may influence the degree to which flowering is accelerated, a factor the investigators plan to explore in future work.
The researchers tried to manually replicate the damage patterns caused by bees to see if they could reproduce the effect on flowering time. But, while this manipulation did lead to somewhat earlier flowering in both plant species, the effect was not nearly as strong as that caused by the bees themselves. This leads De Moraes to suggest that some chemical or other cue may also be involved. "Either that or our manual imitation of the damage wasn't accurate enough," she says. Her team is currently trying to identify the precise cues responsible for inducing flowering and characterizing the molecular mechanisms involved in the plant response to bee damage.

Bumblebees speed up flowering
On this roof terrace at ETH Zurich, the researchers carried out field experiments. If there are plenty of flowers, bumblebees do not harm the plants. Credit: ETH Zurich
Phenomenon also observed in the field
The ETH research team was also able to observe the bees' damaging behavior under more , with doctoral student Harriet Lambert leading follow-up studies on the rooftops of two ETH buildings in central Zurich. In these experiments, the researchers again observed that hungry bumblebees with insufficient pollen supplies frequently damaged the leaves of non-blooming plants. But the damaging behavior was consistently reduced when the researchers made more flowers available to the bees.
Furthermore, it was not only captive-bred bumblebees from the researchers' experimental colonies that damaged plant leaves. The investigators also observed wild bees from at least two additional bumblebee species biting the leaves of plants in their experimental plots. Other pollinating insects, such as honeybees, did not exhibit such behavior, however: they seemed to ignore the non-flowering plants entirely, despite being frequent visitors to nearby patches of flowering plants.

Bumblebees speed up flowering
If the bumblebees are deprived of their food basis—in an experiment by mowing the flower meadow—the insects begin to damage plants. Credit: ETH Zurich
Delicate balance starting to tip
"Bumblebees may have found an effective method of mitigating local shortages of pollen," De Moraes says. "Our open fields are abuzz with other pollinators, too, which may also benefit from the bumblebees' efforts." But it remains to be seen whether this mechanism is sufficient to overcome the challenges of changing climate. Insects and flowering plants have evolved together, sharing a long history that strikes a delicate balance between efflorescence and pollinator development. However,  and other anthropogenic environmental changes have the potential to disrupt the timing of these and other ecologically important interactions among species. Such rapid environmental change could result in insects and  becoming increasingly out of sync in their development, for example. "And that's something from which both sides stand to lose," Mescher says.'Bee' thankful for the evolution of pollen

More information: Foteini G. Pashalidou et al. Bumble bees damage plant leaves and accelerate flower production when pollen is scarce, Science (2020). DOI: 10.1126/science.aay0496
Journal information: Science 
Provided by ETH Zurich 

When do plants help or hinder each other?

meadow
Credit: CC0 Public Domain
When plants grow close together, each individual plant has less chance of doing well—at least, that was the accepted wisdom in environmental research. Now Dr. Ruichang Zhang and Professor Katja Tielbörger from the Institute of Evolution and Ecology at the University of Tübingen are challenging that principle. Their investigation of the combined effects of environmental stress and competition on plants has led them to develop a new theoretical model suggesting that plants can 'help' each other out. The researchers were able to confirm their model predictions in detail in an experiment with real plants. Their study has been published in the latest Nature Communications.
Competition leads to fewer resources being available for each individual organism. "If the crowding becomes too much, this can even lead to the death of individual ," says Katja Tielbörger. Yet there are many empirical studies that show that plants can also facilitate each other. Tielbörger says this is often the case when plants grow under stressful conditions—for instance, when the soil is saline or the temperatures are high. "When it's very hot, for example, large plants can provide shade, which in turn can create better conditions for smaller plants that grow under the canopy of the larger ones," she adds. It seems logical that such positive interactions are most important when  is high. It has therefore long been postulated that facilitation in bad times may turn into competition when conditions are good.
Experiments with Arabidopsis
The two Tübingen researchers have now combined the density and  factors in a novel . "This showed that under intense stress, it can be advantageous to have many neighbors and that competition only occurs at very high densities," Tielbörger sums up. From the point of view of the individual plant, the relationship between density and thriving is like a hump-shaped curve. The Tübingen researchers simulated the model conditions in an experiment using Arabidopsis thaliana or thale cress—the plant commonly used as a model in molecular biology. "The experiment confirmed all the predictions arising from our model," says Tielbörger. For example, the plants suffered considerably less from salt stress when they had many neighbors. And they suffered from competition by neighbors only when they were not under stress.
Because of the complexity of ecological systems, models are a popular method for better understanding nature. Tielbörger says it is remarkable to find such a close match between theory and reality in ecological research: "This shows how robust and universally valid our actually quite simple model is." The  may help to better predict the response of plants to stress—such as increased heat and drought—which are to be expected as the climate changes.Hormone keys plant growth or stress tolerance, but not both

More information: Ruichang Zhang et al. Density-dependence tips the change of plant–plant interactions under environmental stress, Nature Communications (2020). DOI: 10.1038/s41467-020-16286-6
Journal information: Nature Communications 
Provided by Universitaet Tübingen 

Researchers create global arsenic-in-groundwater maps to highlight threats


by Bob Yirka , Phys.org

Modeled probability of arsenic concentration in groundwater exceeding 10 µg per liter (red: high probability, blue: low probability). Credit: Joel Podgorski, Michael Berg, Eawag

A pair of researchers at the Swiss Federal Institute of Aquatic Science and Technology has created a global map that highlights areas where there are likely dangerous levels of arsenic in groundwater. In their paper published in the journal Science, Joel Podgorski and Michael Berg describe combining data from a variety of sources to train a machine learning algorithm to highlight possible hot spots on a global map. Yan Zheng, with Southern University of Science and Technology has published a Perspective piece outlining the work by the research pair in the same journal issue.


The current pandemic has captured the attention of the world, and for good reason. But other threats continue to put millions of people at risk. One of these, as Zheng notes, is arsenic consumption. Commonly known as a type of poison used to kill rivals, arsenic is a metalloid that, when consumed, can cause serious medical problems and, of course, death. It is also a chemical element that is commonly found in soil and rocks. In some cases, conditions exist that allow arsenic to make its way into groundwater, where it can be pulled up and consumed, putting people at risk.

Scientists have been aware of the problem of arsenic poisoning groundwater in such places as Argentina, Bangladesh and Vietnam. The WHO is also aware of the problem—they have set a concentration of 10 micrograms per liter as a safety limit in consumable water. In this new effort, Podgorski and Berg, an environmental scientist and hydrologist respectively, suspected that there are likely more hotspots than are currently known, so they set themselves the task of revealing likely hotspots around the world by analyzing vast amounts of data.


Play
Modeled probability of arsenic concentration in groundwater exceeding 10 µg per liter (red: high probability, blue: low probability). Credit: Joel Podgorski, Michael Berg, Eawag

The work involved assembling data from over 80 studies and then using a machine learning algorithm that processed the data and made estimates on the likelihood of arsenic levels in groundwater for 1-km2-patches covering the entire globe. They then used the predictions to create a map showing arsenic threat levels. The map showed that up to 220 million people around the globe may be at risk of drinking water contaminated with dangerous levels of arsenic.


Play
https://phys.org/news/2020-05-global-arsenic-in-groundwater-highlight-threats.html
Modeled probability of arsenic concentration in groundwater exceeding 10 µg per liter (red: high probability, blue: low probability). Credit: Joel Podgorski, Michael Berg, Eawag 


More information: Joel Podgorski et al. Global threat of arsenic in groundwater, Science (2020). DOI: 10.1126/science.aba1510

Environmentalists suggest COVID-19 could represent a new opportunity for a more diverse future

tropical plants
Credit: CC0 Public Domain
A team of environmental researchers at the Australian Rivers Institute–Coast & Estuaries, School of Environment and Science, Griffith University, is suggesting in a Letters piece in the journal Science that the COVID-19 pandemic could represent a new opportunity for a more diverse future—they suggest that with proper planning, we could use what has been learned from the global lockdown to improve global biodiversity.
As the global  has kept millions of people the world over isolating in their homes, nature has reacted. Reports of wild animals roaming city streets and small towns alike have made headlines. Also, the air has become cleaner, and many cities have become quiet. Such changes have served as a reminder that humans are not the sole residents of planet Earth.
In their , the team in Australia suggests that the changes we have observed might be presenting the world with a new opportunity to alter the ways that governments and environmentalists approach the issue of diversification as we move into a post-pandemic world. They note that history has shown that dramatic world events can lead to change—the Chernobyl meltdown in Ukraine, for example, led to humans abandoning huge swaths of land, allowing nature to take its course. The result has been the creation of a very large wilderness area now designated as an ecological reserve.
Another example was the Columbian conflict, which, for years, served as a protection zone for plants and animals because humans were afraid to venture into areas occupied by armed rebels. They suggest the lockdown effect could have a similar impact if long-term strategies are put in place to preserve the  that nature has made, and to expand on them to increase biodiversity in other places.
The key, they claim, is for legislation protecting areas where biodiversity is present and to push for more areas to join them. They also note that the lockdown has coaxed people into rethinking some of their consumer habits—and maybe to changing some as the pandemic ends. They argue that the pandemic could represent a tipping-point in how the human race views the planet. This could be a time for development of new strategies, they suggest, and to implement them—to tip the balance in favor of a more diverse, environmentally friendly planet.Review study shows social interaction a major factor in both morbidity and mortality
More information: Jennifer Sills et al. COVID-19 recovery can benefit biodiversity, Science (2020). DOI: 10.1126/science.abc1430
Journal information: Science