Wednesday, June 02, 2021

Ancient volcanic eruption destroyed the ozone layer

KING ABDULLAH UNIVERSITY OF SCIENCE & TECHNOLOGY (KAUST)

Research News

A catastrophic drop in atmospheric ozone levels around the tropics is likely to have contributed to a bottleneck in the human population around 60 to 100,000 years ago, an international research team has suggested. The ozone loss, triggered by the eruption of the Toba supervolcano located in present-day Indonesia, might solve an evolutionary puzzle that scientists have been debating for decades.

"Toba has long been posited as a cause of the bottleneck, but initial investigations into the climate variables of temperature and precipitation provided no concrete evidence of a devastating effect on humankind," says Sergey Osipov at the Max Planck Institute for Chemistry, who worked on the project with KAUST's Georgiy Stenchikov and colleagues from King Saud University, NASA and the Max Planck Institute for Chemistry.

"We point out that, in the tropics, near-surface ultraviolet (UV) radiation is the driving evolutionary factor. Climate becomes more relevant in the more volatile regions away from the tropics," says Stenchikov.

Large volcanic eruptions emit gases and ash that create a sunlight-attenuating aerosol layer in the stratosphere, causing cooling at the Earth's surface. This "volcanic winter" has multiple knock-on effects, such as cooler oceans, prolonged El Niño events, crop failures and disease.

"The ozone layer prevents high levels of harmful UV radiation reaching the surface," says Osipov. "To generate ozone from oxygen in the atmosphere, photons are needed to break the O2 bond. When a volcano releases vast amounts of sulfur dioxide (SO2), the resulting volcanic plume absorbs UV radiation but blocks sunlight. This limits ozone formation, creating an ozone hole and heightening the chances of UV stress."

The team examined UV radiation levels after the Toba eruption using the ModelE climate model developed by NASA GISS (Goddard Institute for Space Studies). They simulated the possible after-effects of different sizes of eruptions. Running such a model is computationally intensive, and Osipov is grateful for the use of KAUST's supercomputer, Shaheen II, and associated expertise.

Their model suggests that the Toba SO2 cloud depleted global ozone levels by as much as 50 percent. Furthermore, they found that the effects on ozone are significant, even under relatively small eruption scenarios. The resulting health hazards from higher UV radiation at the surface would have significantly affected human survival rates.

"The UV stress effects could be similar to the aftermath of a nuclear war," says Osipov. "For example, crop yields and marine productivity would drop due to UV sterilization effects. Going outside without UV protection would cause eye damage and sunburn in less than 15 minutes. Over time, skin cancers and general DNA damage would have led to population decline."

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The narrative of becoming a leader is rooted in culture

The growth stories of Finnish leaders repeat the same elements as the leadership stories in the beloved Finnish literary masterpieces The Unknown Soldier and Under the North Star

UNIVERSITY OF VAASA

Research News

IMAGE

IMAGE: WHAT ARE THE GROWTH STORIES OF FINNISH LEADERS LIKE? IN A RECENT STUDY FROM THE UNIVERSITY OF VAASA, FINNISH DIRECTORS WERE ASKED ABOUT THEIR PATHS TO LEADERSHIP AND THESE GROWTH... view more 

CREDIT: SEPPÄLÄN VALOKUVAAMO

What are the growth stories of Finnish leaders like? In a recent study from the University of Vaasa, Finnish directors were asked about their paths to leadership and these growth stories were compared with the leadership stories in Väinö Linna's novels. According to the study, the directors' stories repeat elements that are rooted in our cultural heritage and can also be seen in Linna's novels.

M.A. Krista Anttila's doctoral dissertation at the University of Vaasa examines established cultural modes of talking regarding the leader development process. By analysing leaders' talk about their journeys to leadership and by comparing and contrasting it with culturally significant pieces of literature, Anttila makes customary modes of narrating visible and shows also that these modes of narrating have their roots in cultural history. Through the use of literary and sociological means, she illustrates the subtle differences between those modes in a narrative form.

The dissertation arises from the recent need to examine Finnish leadership in more detail. In addition to leadership, the dissertation is also linked to discussions regarding leader and entrepreneurship education, class and habitus, and the role of language in shaping cultural reality.

Anttila's study shows that particular, culturally established modes of discourse and their elements are being reproduced in interview talk about leadership. Such elements act as templates of individual narrating by partly enabling, partly restricting it, and for this reason, they may shape the way in which leaders conceive leadership and live life. Anttila, therefore, delineates also other possible, perhaps more up-to-date modes of talking about the phenomenon.

"The results of my doctoral study can be used for instance in counselling-based leader development methods such as executive coaching, occupational therapy, or in workplace development activities", says Anttila.

According to Anttila, the doctoral dissertation was built on Vilma Hänninen's model of narrative circulation, more specifically, the notion of inner narrative, which was developed into the concept of illustrative inner narrative.

The empiric part of the dissertation made use of two types of text materials: interviews and literature. Anttila interviewed twelve leaders from different fields about their growth journeys to leadership.

"In addition, I used two culturally significant novels, Väinö Linna's Unknown Soldiers and Reconciliation and selected leader development stories in them, as means of comparison and complementation", says Anttila.

By using narrative analysis methods, Anttila identified the themes and features found in both the materials. Finally, she constructed ideal-typical leader development narratives with different habituses out of their shared resources.

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Doctoral dissertation

Anttila, Krista (2021) Leader Development as a Cultural and Narrative Phenomenon. Acta Wasaensia 461. Doctoral dissertation. University of Vaasa.

Publication pdf: http://urn.fi/URN:ISBN:978-952-476-956-3

The public examination of M.A. Krista Anttila's doctoral dissertation " Leader Development as a Cultural and Narrative Phenomenon" was successfully held on Tuesday 1 June, 2021. The field of dissertation is Management. Professor Alf Rehn (University of Southern Denmark) acted as opponent and Professor Riitta Viitala as custos.

 

New device helps restore penile length and sexual function after prostate cancer surgery

WOLTERS KLUWER HEALTH

Research News

June 1, 2021 - A new type of penile traction therapy (PTT) device can increase penile length and preserve erectile function in men who have undergone prostate cancer surgery (prostatectomy), reports a clinical trial in The Journal of Urology®, Official Journal of the American Urological Association (AUA). The journal is published in the Lippincott portfolio by Wolters Kluwer.

"Our randomized trial suggests penile traction therapy using a new type of device provides an effective new option for penile rehabilitation after prostatectomy," comments senior author Landon Trost, MD, of Male Fertility and Peyronie's Clinic in Orem, Utah. "These objective findings are backed by men reporting an increase in their sexual satisfaction."

While nerve-sparing approaches have reduced the risk of erectile dysfunction and other sexual complications after prostate cancer surgery, men may still experience these issues - sometimes including a reduction in penis size, as well as functioning. Medications and vacuum devices are commonly used, but with limited success.

Originally developed to treat penile curvature due to Peyronie's disease, the new device (marketed under the brand name RestoreX) works by applying gentle, dynamic pressure to stretch and shape the penis. Studies in men with Peyronie's disease have shown the new device can produce significant straightening and increased penile length with as little as 30 minutes of daily use - compared to several hours with previous PTT devices.

Could the same approach be used to improve penile form and functioning after prostate cancer surgery? In the new trial, 82 men (average age 59 years) who had undergone prostatectomy were randomly assigned to six months of daily PTT using the new device or no treatment. Six-month follow-up data were available for 30 men in the PTT group and 25 in the control group.

"Men receiving PTT had significant improvements in most of the objective or subjective measures evaluated," according to Dr. Trost. That included a significant increase in penile length: an average gain of 1.6 centimeters in the PTT group, compared to little or no change (average 0.3 cm) in the control group.

Erectile function was also improved with PTT: men assigned to the study treatment had no change on a standard erectile function score, compared to a significant decline in the control group. Patients assigned to PTT were also less likely to use other treatments for erectile dysfunction, including medications and injection therapies.

The PTT group also had higher scores for sexual satisfaction, including satisfaction with intercourse. Average patient satisfaction score was 8 out of 10; more than 90 percent of patients said they would recommend the treatment to a friend. The outcomes of PTT were similar on two treatment schedules, with average device use of 90 or 150 minutes per week. Discomfort and other side effects were mild and generally temporary.

The authors note some limitations of their study, including the relatively low follow-up rate, partly due to the COVID-19 pandemic. They plan a further three-month evaluation, including offering the new approach to PTT to men originally assigned to no treatment.

The study is the first randomized clinical trial of any treatment to preserve erectile function after prostatectomy. "Our findings need to be validated in further studies," says Dr. Trost. "If they are, PTT would be the first treatment with high-quality research data showing improvement in penile length and erectile function in men who have undergone prostatectomy, without medications or other on-demand therapies."

Senior author Landon Trost, MD, developed RestoreX during his time at the Mayo Clinic in cooperation with Mayo Clinic Ventures. PathRight Medical has licensed the technology from Mayo Clinic and maintains rights to the technology.

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Click here to read "Efficacy of a Novel Penile Traction Device in Improving Penile Length and Erectile Function Post Prostatectomy: Results from a Single-Center Randomized, Controlled Trial." DOI: 10.1097/JU.0000000000001792

About The Journal of Urology®

The Official Journal of the American Urological Association (AUA), and the most widely read and highly cited journal in the field, The Journal of Urology® brings solid coverage of the clinically relevant content needed to stay at the forefront of the dynamic field of urology. This premier journal presents investigative studies on critical areas of research and practice, survey articles providing brief editorial comments on the best and most important urology literature worldwide and practice-oriented reports on significant clinical observations. The Journal of Urology® covers the wide scope of urology, including pediatric urology, urologic cancers, renal transplantation, male infertility, urinary tract stones, female urology and neurourology.

About the American Urological Association

Founded in 1902 and headquartered near Baltimore, Maryland, the American Urological Association is a leading advocate for the specialty of urology, and has nearly 24,000 members throughout the world. The AUA is a premier urologic association, providing invaluable support to the urologic community as it pursues its mission of fostering the highest standards of urologic care through education, research and the formulation of health care policy. To learn more about the AUA visit: http://www. auanet. org.

About Wolters Kluwer

Wolters Kluwer (WKL) is a global leader in professional information, software solutions, and services for the clinicians, nurses, accountants, lawyers, and tax, finance, audit, risk, compliance, and regulatory sectors. We help our customers make critical decisions every day by providing expert solutions that combine deep domain knowledge with advanced technology and services.

Wolters Kluwer reported 2020 annual revenues of €4.6 billion. The group serves customers in over 180 countries, maintains operations in over 40 countries, and employs approximately 19,200 people worldwide. The company is headquartered in Alphen aan den Rijn, the Netherlands.

Wolters Kluwer provides trusted clinical technology and evidence-based solutions that engage clinicians, patients, researchers and students in effective decision-making and outcomes across healthcare. We support clinical effectiveness, learning and research, clinical surveillance and compliance, as well as data solutions. For more information about our solutions, visit https://www. wolterskluwer. com/en/health and follow us on LinkedIn and Twitter @WKHealth.

For more information, visit http://www. wolterskluwer. com, follow us on Twitter, Facebook, LinkedIn, and YouTube.

Early bird or night owl? Study links shift worker sleep to 'chronotype'

Sleep styles may hold the key to designing better work schedules

MCGILL UNIVERSITY

Research News

Getting enough sleep can be a real challenge for shift workers affecting their overall health. But what role does being an early bird or night owl play in getting good rest? Researchers from McGill University find a link between chronotype and amount of sleep shift workers can get with their irregular schedules.

"Some people seem to be hardwired to sleep early, while others tend to sleep late. This preference, called chronotype, is modulated by our circadian system - each person's unique internal timekeeper," says lead author Diane B. Boivin, a Professor in the Department of Psychiatry at McGill University.

Their study published in Sleep is the first to examine the relationship between chronotype and sleep behaviour in shift workers during morning, evening, and night shifts. To investigate this relationship, the researchers tracked 74 police officers as they worked their usual shifts. For close to a month, the officers wore a watch-like device, allowing researchers to measure their sleep.

Not all shifts created equal

"Our results suggest that the effect of chronotype on sleep duration and napping behavior depends on the shift type. On average early risers sleep 1.1 hours longer on morning shifts, while night owls sleep two hours longer on evening shifts," says co-author Laura Kervezee, a former Postdoctoral Fellow at The Douglas Research Centre affiliated with McGill University.

The power of naps

While shift workers take naps to reduce the effect of their irregular schedules on their sleep, the researchers found this behaviour was more prominent during night shifts in early risers. Generally, early risers slept less after night shifts compared to night owls - but they also took more naps prior to their night shifts, so their total daily sleep was similar.

The findings could help design strategies to improve sleep in workers with atypical schedules, the researchers say. Such strategies could include work schedules that consider chronobiological principles.

"People involved in shift work experience an increased risk of sleep disturbances and fragmented sleep periods. Since sleep is essential for optimal performance, health, and well-being, it's important to develop strategies to get better rest," says Boivin, who is also the Director of the Centre for Study and Treatment of Circadian Rhythms at The Douglas Research Centre.

As next steps, the researchers hope to study the impact of chronotype and shift work on other health outcomes.

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About this study

"The relationship between chronotype and sleep behavior during rotating shift work: a field study" by Laura Kervezee, Fernando Gonzales-Aste, Phillipe Boudreau, and Diane B. Boivin was published in Sleep. This study was supported by a grant from the Institut de recherche Robert-Sauvé en santé et en sécurité du travail.

TWO: https:// two. org/10. 1093/sleep/zsaa225


 

Foster care, homelessness are higher education hurdles

New research shows stable housing, money for books among chief concerns

UNIVERSITY OF GEORGIA

Research News

A college education is estimated to add $1 million to a person's lifetime earning potential, but for some students the path to earning one is riddled with obstacles. That journey is even more difficult for students who have been in the foster care system or experienced homelessness, according to a new study from the University of Georgia.

But the more college administrators and faculty know about these students' problems, the more they can do to ease the burden.

Getting into universities in the first place can frequently be a challenge for students who've had unstable home lives, said David Meyers, co-author of the study.

"Research tells us that every time a student moves from one foster care placement to another, they lose six months of educational progress," said Meyers, a public service associate in the J.W. Fanning Institute for Leadership Development. "That's a pretty serious setback. It's a challenge for them to participate in after-school activities or athletics. Their college resume is not going to be as strong as those students who don't face those same challenges."

It's a similar struggle for students who've experienced homelessness. For those who beat the odds, getting into college is just the start of a whole new set of hurdles. The added stressors of having to figure out how to pay for courses, books and housing once they get there--something many of their classmates don't have to think about--take a tremendous toll.

"Having to act like an adult when you're still a kid presents huge challenges for students trying to get into college," said Kim Skobba, co-author of the paper and an associate professor in the College of Family and Consumer Sciences. "But then when you get to college, you're still on your own."

Entirely on their own

The study, published in the Journal of Adolescent Research, focuses on the experiences of 27 college students, all attending four-year institutions, who had been in foster care, experienced homelessness or both. The researchers conducted a series of three in-depth interviews with each participant over the course of one academic year, and several clear themes emerged.

These students all had to "get by" largely on their own. They often were without parental guidance or support during high school, and in college they were entirely on their own. Many took jobs, sometimes going to school full time while also working full or nearly full-time hours.

One student described having six classes while also working 40 hours a week, saying, "I kept breaking down. ... I was staying up to about 2 or 4 in the morning doing homework and waking up at 7." (This type of experience was more common among students who had been homeless than those who were in foster care at the time of their high school graduation.)

One of the biggest expenses for all the students in the study was paying for and maintaining stable housing. Eleven of them experienced at least one period of homelessness since beginning college, living in their cars or couch surfing.

Another constant issue was finding money for books and food. Even with scholarship support, many of the students would ask professors whether the book was essential for success in their course and if so would borrow a friend's book or even one of the professor's copies, if possible.

Perhaps not surprisingly, these stressors made it difficult for students to focus on their academics.

"It takes a mental and emotional toll on these students," Meyers said. "We think about it in financial terms, but it really, I think, also shows up in sort of this constant emotional challenge. Being thoughtful, being vigilant, never really having the luxury of being able to set it aside."

Finding solutions

Institutions like UGA are taking steps to address this issue, with programs that provide emotional support while connecting students to resources they might otherwise not know exist.

Embark@UGA, for example, is the campus-based component of Embark Georgia, an effort led by Meyers and Lori Tiller, a colleague at the Fanning Institute. The program is a statewide network that connects the University System of Georgia and Technical College System of Georgia to the Division of Family and Children Services, the Georgia Department of Education, and numerous nonprofit and community organizations seeking to increase college access and retention for students who have experienced foster care or homelessness.

Through Embark, each USG university and technical college campus and every high school in Georgia has a point of contact to help identify and provide resources to homeless and former foster students who need help.

Additionally, scholarships like Let All the Big Dawgs Eat, which provides a food stipend for students, have also helped narrow the gap. UGA also has made a point to start using free online textbooks in many courses.

But not all schools have the same resources.

"Expanding programs at the federal level that would serve students who've been in foster care or homeless would really help close that gap," Skobba said. "We also don't want them taking out huge loans because that's not a good financial situation long term. And some kind of financial aid grant program serving this group would make a huge difference."

Another big help? Understanding and awareness from professors that not all students are able to spend hundreds of dollars on textbooks or don't have a personal laptop to use for class assignments.

"I think I was already a pretty flexible understanding professor, but just realizing that if you're working 40 hours because that's what it takes to stay in school, some things are going to drop from time to time," Skobba said. "Having a little bit of breathing room in your syllabus and assignments is probably beneficial to all students, but it's going to be especially helpful for this group of students."

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Diann Moorman, associate professor in the College of Family and Consumer Sciences, is also a co-author on the study.

 

More salmonella infections in Europe: Hygiene rules help prepare poultry safely

Special care when handling raw meat and thorough cooking can prevent illnesses

BFR FEDERAL INSTITUTE FOR RISK ASSESSMENT

Research News

In recent months, more than three hundred cases of salmonellosis have occurred in various European countries and Canada, which are linked to each other. In the UK the cases could be partly traced back to frozen breaded poultry meat. The cause was contamination with the bacterium Salmonella Enteritidis, which causes gastrointestinal inflammation. Salmonella is not killed by deep freezing and can remain infectious at temperatures below zero degrees Celsius. The Robert Koch Institute (RKI) and the BfR are monitoring the situation together with the Federal Office of Consumer Protection and Food Safety (BVL). In Germany, the number of reported cases has currently risen to more than 20 in six federal states. In 2020, there were a total of about 10,000 reported cases of salmonellosis in Germany, most of which were caused by the consumption of contaminated food. In principle, foodborne infections can be avoided by paying particular attention to hygienic care when preparing raw poultry. Due to the measures taken to contain the COVID 19 pandemic, people are currently cooking more often at home and, in the course of this, convenience products such as frozen goods are also being used more frequently. Sometimes it is not obvious at first glance whether such products contain pre-cooked or raw meat. Sufficient heating should always be ensured during preparation, especially of products containing raw poultry meat. In addition, bacterial contamination of other dishes via the raw meat and breading is possible. "Especially for children and elderly people there is a higher risk of getting sick from salmonella," says BfR President Prof. Dr. Dr. Andreas Hensel.

Link to the FAQs: https://www. bfr. bund. de/en/selected_faqs_on_poultry_meat-54623. html

Investigations by the official food monitoring authorities show that raw poultry and poultry meat products - including frozen products - can be contaminated with pathogens. In 2018, Salmonella was found in 5.6% of chicken meat samples examined and Campylobacter bacteria in every second sample. For this reason, the BfR encourages adherence to its recommendations on the handling and preparation of poultry and poultry products.

It is true that germs such as salmonella and campylobacter are killed during the preparation of poultry meat if the correspondingly high temperatures are reached during cooking. But by transferring these germs to hands, household utensils and kitchen surfaces, other food can become contaminated with these pathogens. If this contaminated food is not reheated before consumption, one can fall ill. Since salmonella can multiply in food at temperatures above 7 °C, there is a particular risk when eating food that is kept unrefrigerated for a long time, such as salads and desserts.

Therefore, the following general hygiene rules should be strictly followed when preparing raw poultry:

    - Store and prepare raw poultry products and other foods separately, especially when the latter are not reheated

    - Store fresh poultry at a maximum of +4 °C and process and consume until the use-by date.

    - Defrost frozen poultry without packaging in the refrigerator (cover and place in a bowl to collect the defrost water).

    - Dispose packaging materials carefully and discard defrost water immediately.

    - Do not wash poultry, as the splashing water can spread germs; it is better to process it directly or dab it with a paper towel, which should be disposed of directly.

    - Utensils and surfaces that have come into contact with raw poultry products or defrost water must be cleaned thoroughly with warm water and washing-up liquid before further use.

    - Clean hands thoroughly with warm water and soap between each preparation step.

About the BfR

The German Federal Institute for Risk Assessment (BfR) is a scientifically independent institution within the portfolio of the Federal Ministry of Food and Agriculture (BMEL) in Germany. The BfR advises the Federal Government and the States ('Laender') on questions of food, chemical and product safety. The BfR conducts its own research on topics that areclosely linked to its assessment tasks.

This text version is a translation of the original German text which is the only legally binding version.

How the major Swedish forest fire of 2014 affected the ecosystem

UPPSALA UNIVERSITY

Research News

Swedish researchers from institutions including Uppsala University have spent four years gathering data from the areas affected by the major forest fire of 2014. In their study of how the ecosystem as a whole has been altered, they could see that water quality in watercourses quickly returned to normal, while forested areas continued to lose carbon for many years after the fire.

The consequences of major forest fires remain poorly studied in Northern Europe. To improve this situation, researchers from Uppsala University, the Swedish University of Agricultural Sciences (SLU) and the Swedish Meteorological and Hydrological Institute (SMHI) decided to investigate just how much carbon and nutrients are released into the atmosphere and watercourses during fires and how quickly the ecosystem returns to its previous state. The results of this research are now being presented in the scientific journal Biogeosciences.

The 2014 fire in the Swedish province Västmanland was particularly ferocious, burning both woodland and wetland. Only in a few areas did the trees survive.

"It is not however the trees that release carbon during fires in coniferous forests. Only some of the needles and small branches up in the trees burn, while around 90% of losses come from organic soil, the so-called humus layer. Ditched peatlands that dry a great deal of organic material in the soil are therefore large point sources for emissions from the landscape. This makes it important to measure how deep the burning goes in the ground in order to estimate carbon emissions after a forest fire. We had the opportunity to do just that over a wide area in Västmanland," says Uppsala University researcher Gustaf Granath, lead author of the study.

The loss of the humus layer releases large amounts of carbon and nitrogen from woodland and risks other nutrients leaching out after the fire. It is therefore important that vegetation can quickly re-establish itself in the interests of retaining nutrients and restoring soil carbon.

The results from Västmanland demonstrate that during the fire between 145 and 160 tonnes of carbon dioxide was lost to the atmosphere per hectare. For the whole burned area this is equivalent to 10% of the carbon dioxide emitted annually by Sweden's domestic transport sector. Due to the lack of vegetation after the fire, the soil continued to lose carbon over the next few years, with a net uptake of carbon first noted during a summer month three years after the fire. Researchers were concerned that a great deal of carbon would be lost to watercourses after the fire but were unable to observe any such additional export of carbon into streams when comparing conditions before and after the fire.

Quantities of nutrients such as nitrogen and phosphorus did however increase in streams and lakes after the fire, reaching a peak within one to two months of the fire before declining over time. For many of these substances, in the region of five times as much was transported away during the first year after the fire compared to before; however, most values had returned to normal one to two years after the fire.

"This rapid leaching of nutrients after the fire is due to the lack of vegetation that could absorb the substances, as well as the large release of the substances during the fire as organic soil burned. Without living vegetation and organic soil, water flows in streams increased by 50%" explains Stephan Köhler, professor of environmental geochemistry at SLU, who initiated the measurement of water quality immediately after the fire.

Other studies have shown how vegetation in the area of forest fires has re-established itself and how carbon and nutrient stocks have been rebuilt. How quickly this happens and what parameters affect the process will influence whether or not Sweden's forests could become long-term sources of CO2 to the atmosphere, is something that the researchers intend to continue studying in the area.

"While we now know more about how much and where carbon and nutrients disappear in fires, what happens next is equally interesting. There is a great deal of carbon bound in dead trees that will soon begin to decompose, while at the same time the soil and vegetation will store new carbon and build up stocks of nitrogen. It's important to follow this if we are to understand how our forests are affected when they burn," says Gustaf Granath.

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The study has been funded by the Swedish Agency for Marine and Water Management and Formas.


CAPTION

Three years after the fire at Hälleskogsbrännan, Västmanland, Sweden, a lot of vegatation has has re-established itself.

CREDIT

Gustaf Granath


Trust among corvids

UNIVERSITY OF KONSTANZ

Research News

Siberian jays are group living birds within the corvid family that employ a wide repertoire of calls to warn each other of predators. Sporadically, however, birds use one of these calls to trick their neighbouring conspecifics and gain access to their food. Researchers from the universities of Konstanz (Germany), Wageningen (Netherlands), and Zurich (Switzerland) have now examined how Siberian jays avoid being deceived by their neighbours. The study, published in the journal Science Advances, shows that these birds have great trust in the warning calls from members of their own group, but mainly ignore such calls from conspecifics of neighbouring territories. Thus, the birds use social information to differentiate between trustworthy and presumably false warning calls. Similar mechanisms could have played a role in the formation of human language diversity and especially in the formation of dialects.

Deception and lies

Deception and lies are surprising aspects of human communication and the use of language in which false information is intentionally communicated to others, allowing an individual to gain an advantage over the recipient of such false information. However, language is actually highly pro-social and cooperative and is mainly used to share reliable information. Thus, language can only function properly and be maintained if deception is kept to a minimum or other mechanisms are in place to recognize and avoid deception.

People do judge the reliability of communication partners based on personal experience. "If someone repeatedly lies to you, you will most likely stop trusting this person very quickly," says Dr Michael Griesser, a biologist at the University of Konstanz. Griesser authored the study together with Dr Filipe Cunha, whose doctoral thesis he supervised. But do we observe deception in animals as well, and, if so, which mechanisms do animals use to avoid being deceived?

Warning calls of the Siberian jay

Indeed, a number of species are able to deceive their conspecifics, including some species of primates and birds like the Siberian jay (Perisoreus infaustus). Siberian jays live in territorial groups and have an elaborate communication system: A wide range of calls allow them to warn each other of the presence of different predators as well as the behaviour of their fiercest enemy, the hawk.

Occasionally, however, neighbours intruding into a group's territory use the same calls that would otherwise indicate the presence of a perched hawk for a different purpose. Their aim is to deceive the members of the group about the presence of the predator, thus scaring them away to get access to their food. "It is a commonly observed phenomenon in the animal kingdom that warning calls are used to deceive others. Clearly, the recipients of the false information potentially pay a high price if they ignore the warning," says Cunha.

Only trust those you know?

To find out how Siberian jays identify and respond to this type of deception, the researchers examined a population of wild Siberian jays in northern Sweden. They attracted experienced individuals to a feeding site and recorded video footage of what happened. As soon as such an experienced individual visited the feeder, a loudspeaker played recordings of Siberian jays' warning calls designating a perched hawk. These calls were recordings from former members of the visitor's own group, birds from neighbouring territories, or birds that the visitor had never encountered before. Using the video recordings, the researchers measured how long it took the visitor to leave and return to the feeder.

These "playback experiments" demonstrated that experienced Siberian jays responded quicker and took longer to return to the feeder when hearing warning calls of a former member of their own group than when exposed to warning calls of neighbouring groups or previously unknown individuals. "Siberian jays thus have a simple rule to avoid being tricked: They only trust the warning calls from members of their own group, meaning cooperation partners. Familiarity alone is not enough, otherwise the birds would also have trusted the calls of their neighbours," Griesser explains.

Deception as a possible factor in language and dialect formation

Michael Griesser draws a comparison to humans and their languages and dialects. Just like Siberian jays, humans preferentially trust others who belong to the same group as themselves and therefore more likely are cooperation partners. "It could thus very well be the case that vulnerability to deception has been a driver of the rapid diversification of human languages and facilitating the formation of dialects as they allow the identification of local cooperation partners," Griesser considers.

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Key facts:

  • Study: Filipe C. R. Cunha, Michael Griesser (2021) Who do you trust? Wild birds use social knowledge to avoid being deceived. Science Advances; DOI: 10.1126/sciadv.aba2862
  • Siberian jays use social information to avoid being deceived by neighbours. The birds reacted exclusively to the warning calls of cooperation partners from their own group and ignored the warning calls of others.
  • Similar mechanisms could have played a role in the diversification of human languages and especially in the formation of dialects.
  • Dr Michael Griesser is an affiliate member of the "Centre for the Advanced Study of Collective Behaviour" and a researcher in the Department of Biology at the University of Konstanz. The study was completed when Griesser worked as a researcher at the University of Zurich.
  • Funding was provided by the Swiss National Science Foundation, via the EU Framework Programme for Research and Innovation, Horizon 2020, the University of Zurich and the Science Without Borders Programme in Brazil.

Note to editors:

You can download a photo here: https://cms. uni-konstanz. de/fileadmin/pi/fileserver/2021/vertrauen_bei_rabenvoegeln. jpg
Caption: A pair of Siberian jays foraging in the study population in Swedish Lapland.
Copyright: Michael Griess