Thursday, April 10, 2025

 

Tree rings track atmospheric mercury cheaply





Cornell University





ITHACA, N.Y. – Wild fig tree rings offer a cheap method for tracking toxic atmospheric mercury, a byproduct of gold mining in the Global South, according to a new Cornell University study.

Research was conducted in the Peruvian Amazon and published April 8 in the journal Frontiers in Environmental Science.

Computer models suggest that atmospheric mercury can potentially travel across the globe, to be deposited back in landscapes. When it falls to the ground or in water, it can accumulate in organisms such as fish and other food sources, where it acts as a neurotoxin to both humans and wildlife.

Environmentalists and scientists may now establish biomonitoring networks with wild fig trees (Ficus insipida) in order to better understand how mercury spreads over time and space.

“We’re trying to reduce emissions, especially from gold mining, as part of the United Nations Minamata Convention on Mercury, and in order to do that, we need to be able to measure it, to see the impact over time,” said Jacqueline Gerson, the study’s corresponding author and assistant professor of environmental and biological engineering. “This really offers a method that can be employed throughout the Global South to understand changes in mercury over time, as well as spatial indicators of mercury.”

Artisanal and small-scale gold mining accounts for about 20% of all the gold produced worldwide and is the biggest single source of mercury pollution. Liquid elemental mercury is used to separate gold from ore; mercury can then enter the environment either when ore residues are dumped onto the landscape or when it is burned off, a practice employed in some 70 countries worldwide.

Previous studies have used tree rings to track mercury levels from coal combustion, particularly in Canada, but the method had not been used in the tropics for measuring mercury from gold mining.

“While the technique itself is not new,” Gerson said, “we wanted to test its application in places where it’s really hard to put out monitors for atmospheric concentrations, because they’re costly and require energy or need to be changed a lot.”

Currently, expensive active mercury monitors pump air through a device to collect mercury and require electricity, while passive air samplers use activated charcoal to collect ambient mercury and are good for remote areas but cost up to $100 each.

For additional information, see this Cornell Chronicle story.

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The number of US nonparents who never want children is growing


Michigan State University





EAST LANSING, Mich. – Recent data from Pew Research Center suggest that Americans are rethinking whether they want to become parents. This could be part of a long-term trend, as a research team from Michigan State University found that the percentage of nonparents in the United States who never want children has doubled over the past 20 years.

“We found that the percentage of nonparents who don’t want any children rose from 14% in 2002 to 29% in 2023,” said Jennifer Watling Neal, professor in MSU’s psychology department and co-author of the study. “During the same period, the percent of nonparents who plan to have children in the future fell from 79% to 59%.”

The study –– published in the Journal of Marriage and Family –– categorized nonparents into several types, including “childfree” people who do not want children, “childless” people who wanted children but can’t have them, and “not yet parents” who plan to have children in the future.

The researchers used data from the National Survey of Family Growth, which surveyed 80,000 adults across seven waves between 2002 and 2023. Because most research using these data focuses on women’s biological fertility, Watling Neal explained that this study is one of the first to consider both men and women as well as desires for both biological and nonbiological children.

“We knew from our prior research that childfree adults were a large and growing group in Michigan,” said Zachary Neal, MSU professor of psychology and co-author of the study. “These new results confirm this is part of a nationwide trend that has been unfolding for over 20 years.”

Different types of nonparents have different needs. One nonparent group whose needs are frequently discussed are childless adults who want children but have had difficulty conceiving and who may seek fertility treatments. However, Neal noted that “relatively few nonparents are childless, and the size of this group has been stable for many years.”

In contrast, as the population of childfree adults continues to grow, it will be important to ensure their unique needs are met. As Watling Neal explained, “childfree adults have needs for long-term contraception and for retirement planning that doesn’t assume having heirs, but medical and financial service providers often aren’t equipped to meet these needs.”

The research team will next explore trends in types of nonparents globally and the role that economics and politics may play.

Note for media: Please include the following link to the study in all online media coverage: https://doi.org/10.1111/jomf.13097

By Shelly DeJong

Read on MSUToday.

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Michigan State University has been advancing the common good with uncommon will for 170 years. One of the world’s leading public research universities, MSU pushes the boundaries of discovery to make a better, safer, healthier world for all while providing life-changing opportunities to a diverse and inclusive academic community through more than 400 programs of study in 17 degree-granting colleges.

For MSU news on the web, go to MSUToday or x.com/MSUnews.

 

Stealing credit for co-workers’ ideas and work hurts a critical organizational resource -- knowledge, new paper says




University of Toronto, Rotman School of Management
Prof. David Zweig 

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David Zweig is a Professor of Organizational Behaviour and Human Resource Management and past Chair of the Department of Management at the University of Toronto Scarborough (2011–2020). He holds a cross-appointment to the Organizational Behaviour and Human Reserouce Management area at the Rotman School of Management. Prof. Zweig's research currently focuses on exploring knowledge hiding in organizations, knowledge theft, investigating the antecedents and outcomes of organizational cynicism, and workplace privacy. He teaches courses at the undergraduate and graduate levels in Organizational Behavior and HR Recruitment and Selection.

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Credit: University of Toronto





April 9, 2025

Stealing credit for co-workers’ ideas and work hurts a critical organizational resource -- knowledge, new paper says

Toronto - If you’ve ever shared an idea only to hear it repeated by someone else or had someone take credit for your work, David Zweig knows exactly what you’re talking about.
 
The University of Toronto professor and expert in workplace deviance watched something similar play out during a work meeting. One colleague said something without getting a response, only to have it repeated later by someone else -- to a better response, but no acknowledgement of who’d said it first.
 
“I noticed that this happened repeatedly. So I started paying attention to how people did or did not credit the work of others,” says Zweig, a professor of organizational behaviour and human resources at the University of Toronto Scarborough and the Rotman School of Management. “Although this notion of knowledge theft is widely recognized in the popular press, there was very little research on this in our field. That got me interested in the impact of being a victim of knowledge theft.”
 
Knowledge theft is about intentionally claiming unjustifiable ownership of somebody else’s contributions, including ideas and work products such as presentations, systems or solutions to a business problem.
 
It turns out that people stealing other people’s ideas and work hurts a lot more than the victims. Driven to find out more, Prof. Zweig and two colleagues ran a series of studies with more than 1,500 workers in different industries in the United States, the United Kingdom and Canada to establish knowledge theft as a distinct form of bad workplace behaviour, figure out how to measure it, and identify how it gets in the way of transmitting knowledge across a firm.
 
They found that knowledge theft was “a really common occurrence in the studies we did,” says Prof. Zweig. “In one study, 91 per cent of the participants reported either being a victim of knowledge theft, being a perpetrator (a knowledge thief), or witnessing this happen to other people. So this is not a low base rate behavior.”
 
Victims of knowledge theft reported being more protective and territorial about their work afterwards, including actively hiding their knowledge or staying silent when colleagues asked for help. They were also likelier to retaliate against colleagues, such as by insulting co-workers. And those reactions weren’t confined to where the theft happened – victims took their bad memories and protective behaviours with them when they changed jobs.
 
Knowledge theft, “creates a really toxic environment,” Prof. Zweig says. “If we get burned, or we’re not getting credit from our leaders or colleagues when our ideas are stolen, we’re not going to be so open with sharing them in the future.”
 
Given that knowledge is a key workplace resource and companies typically promote the sharing of knowledge across the organization, behaviour that sabotages that sharing has to be confronted, Prof. Zweig says.
 
“If you see something, say something,” he says. “You need to call out knowledge theft. Leaders need to do that. They need to be very cognizant that this happens. It can’t be normalized.”
 
Organizations can also focus on rewarding teams as a group instead of individual members to reduce motivations for claiming sole credit, the researchers recommend.

Prof. Zweig will continue his academic work on knowledge theft and its impact on people and organizations. The topic will be addressed in his forthcoming book to be published by Rotman-UTP Publishing. 

The study appears in the Journal of Knowledge Management. It was co-authored by Alycia Damp of the University of Toronto's Centre for Industrial Relations and Human Resources and Kristyn Scott of the Ted Rogers School of Management at Toronto Metropolitan University. 

Bringing together high-impact faculty research and thought leadership on one searchable platform, the Rotman Insights Hub offers articles, podcasts, opinions, books and videos representing the latest in management thinking and providing insights into the key issues facing business and society. Visit www.rotman.utoronto.ca/insightshub. 

The Rotman School of Management is part of the University of Toronto, a global centre of research and teaching excellence at the heart of Canada’s commercial capital. Rotman is a catalyst for transformative learning, insights and public engagement, bringing together diverse views and initiatives around a defining purpose: to create value for business and society. For more information, visit www.rotman.utoronto.ca

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U.S. physician burnout rates drop yet remain worryingly high, Stanford Medicine-led study finds



Stanford Medicine





First, some good news: In late 2023 and early 2024, significantly fewer U.S. physicians reported symptoms of job burnout than they did a few years earlier.

The not-so-good news: Their burnout rates remain stubbornly high compared with those of other American workers.

“It’s concerning because we know from studies published by our research team at Stanford and elsewhere that objective turnover increases and that physicians are more likely to reduce their clinical work hours when burnout is higher,” said Tait Shanafelt, MD, chief wellness officer at Stanford Medicine. “And it comes at a time when we’re already projected to be facing large workforce shortages in medicine, including problems with access to care.”

Shanafelt is the lead author of a study about physician burnout published April 9 in Mayo Clinical Proceedings.

It’s the latest in a series of studies that have provided a snapshot of physician burnout, depression and work-life integration in the United States every three years since 2011. For comparison, researchers evaluate a sample of other American workers at the same intervals.

The studies are not only vital to understanding trends in physician well-being relative to the U.S. workforce but also to gauging the impact on the health care delivery system: On top of its workforce implications, evidence suggests that physician burnout worsens the quality of patient care, increases the risk of medical errors and decreases patient satisfaction.

The Association of American Medical Colleges predicts the United States will face a deficit of 86,000 physicians by 2036. Mitigating the effects of occupational stress in medicine has become a national priority, with the American Medical Association, National Academy of Medicine and the U.S. surgeon general all undertaking efforts to address its underlying causes.

Shanafelt, a professor of hematology and the Jeanie and Stew Ritchie Professor, initiated the series, the first of which was published in 2011. He and his colleagues also published the findings of an off-cycle survey in 2021 — at the height of the pandemic — showing the highest prevalence of burnout and lowest satisfaction with work-life integration in the series’ history. (That particular study did not compare the burnout rates with those of other American workers.)

Since then, job satisfaction among doctors appears to be improving. In the most recent study, 45.2% of respondents reported at least one symptom of burnout compared with 62.8% in 2021, 38.2% in 2020, 43.9% in 2017, 54.4% in 2014 and 45.5% in 2011.

To conduct the study, surveys were sent to physicians between Oct. 19, 2023, and Feb. 26, 2024. Of 9,5079 doctors invited to participate in the survey, 7,643 responded. The ages and genders of the respondents were roughly proportional to those of physicians nationwide.

The physicians were scored on emotional exhaustion and depersonalization — the sense of being detached from work and unfeeling toward patients, respectively — using scales of the Maslach Burnout Inventory, a scientifically developed measure of burnout. The researchers calculated the percentage of respondents manifesting burnout based on a high score in the in one or the other category, or in both.

Women at greater risk

Of the respondents, 58.6% identified as men and 39.6% identified as women, a gender breakdown that approximately mirrors the profession nationally. Burnout rates differed between sexes, with female physicians at risk by about 27% more than male physicians after adjusting for age, specialty and other factors, the study found. Also, doctors in several specialties, including emergency medicine and general internal medicine, were at heightened risk for burnout. This is particularly concerning, Shanafelt said, given that these specialties are often patients’ first point of contact with a health care system.

The investigators used a probability-based sample of nonphysician workers from the general population to compare with a sample of the physician respondents. After adjusting for age, gender, relationship status and work hours, physicians were 82.3% more likely to be experiencing burnout than U.S. workers in other occupations.  

“Many physicians still love what they do, but they just can’t keep doing it at this pace in the current practice environment, with its administrative burdens and regulatory burdens, and the proliferation of asynchronous messaging with patients through the electronic health record,” Shanafelt said, referring to patients’ online correspondence with a doctor. “So physicians are, in essence, just saying, ‘I can’t keep working this way.’”

Lotte Dyrbye, MD, chief well-being officer at the University of Colorado School of Medicine, is the study’s senior author. Researchers from the Mayo Clinic and American Medical Association also contributed to the study.

The study was funded by the Stanford Medicine WellMD and WellPhD Center, the American Medical Association, and the Mayo Clinic Program on Physician Well-Being.

 

 

Sink or Swim: the fate of sinking tectonic plates depends on their ancient tectonic histories



New findings provide a greater understanding of how tectonic plates move



Woods Hole Oceanographic Institution

Recovering ocean bottom seismometers 

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Successfully recovered ocean bottom seismometers onboard the James Cook from both the US Scripps and German DEPAS pools.

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Credit: (Credit: Stephen Hick, U. College London)




Woods Hole, Mass. — Newly published research has revealed that compositional rock anomalies within oceanic plates caused by ancient tectonics influence the trajectory and speed of the plates as they plunge deep into Earth’s mantle.

Between depths of 410 and 660 kilometers lies the mantle transition zone (MTZ), a critical region acting as a gateway for materials entering Earth's deeper mantle. Large distributions of basalt rock compositions within the MTZ can cause subducting plates—ones that slide beneath other—to slow and/or stagnate within this zone, instead of descending directly into the lower mantle. Although basalt reservoirs have previously been discovered in the MTZ, their origins have remained unclear.

An international team of seismologists led by the University of Southampton (and now at the Woods Hole Oceanographic Institution) has provided evidence of an extremely thick MTZ, which can only be explained by a large  basaltic rock composition, suggesting that, in certain regions, entire oceanic slabs—approximately 100 kilometers thick—can possess significant basaltic material.

The findings, published in the journal Nature, provide a greater understanding of plate subduction, which recycles surface materials and volatile elements deep into the Earth's interior, sustaining long-term climate stability, atmospheric balance, and the habitability of our planet over billions of years.

This groundbreaking research is part of the VoiLA (Volatiles in the Lesser Antilles) project, in which the team deployed 34 seismometers on the ocean floor beneath the Lesser Antilles.

"This is the first large scale ocean bottom seismic experiment conducted at an Atlantic subduction zone," said Dr. Catherine Rychert, formerly an Associate Professor at the University of Southampton and currently at the Woods Hole Oceanographic Institution. "We were very surprised to find an unexpected and exceptionally thick—approximately 330 kilometers—mantle transition zone beneath the Antilles, which makes it one of the thickest transition zones observed worldwide. Although the Caribbean is well-known for its sunshine and beaches, it now has a new claim to fame in the world of plate tectonics."

“It’s wild to think that in some ways tectonic plates have a ‘memory’ and that affects the way the plates drive mantle convection and mix material back into the Earth,” said Dr. Nick Harmon, formerly an Associate Professor at the University of Southampton and currently at the Woods Hole Oceanographic Institution.

“It’s wild to think that in some ways tectonic plates have a ‘memory’ and that affects the way the plates drive mantle convection and mix material back into the Earth,” said Dr. Nick Harmon, formerly an Associate Professor at the University of Southampton and currently at the Woods Hole Oceanographic Institution.

Lead author, Dr. Xusong Yang, a former visiting scholar at the University of Southampton and currently at University of Miami, emphasized, "We cannot overlook the inherited compositional heterogeneity of subducting oceanic slabs. It may greatly influence their ultimate fate in Earth's deep interior.”

Dr. Kate Rychert and Dr. Nick Harmon, formerly of the University of Southampton, Professor Saskia Goes from Imperial College London, and Professor Andreas Reitbrock from Karlsruhe Institute of Technology, led the experiment. The experiment was funded by NERC (Natural Environment Research Council, UK) and the ERC (European Research Council).

 

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About Woods Hole Oceanographic Institution

Woods Hole Oceanographic Institution (WHOI) is a private, non-profit organization on Cape Cod, Massachusetts, dedicated to marine research, engineering, and higher education. Established in 1930, its mission is to understand the ocean and its interactions with the Earth as a whole, and to communicate an understanding of the ocean’s role in the changing global environment. WHOI’s pioneering discoveries stem from an ideal combination of science and engineering—one that has made it one of the most trusted and technically advanced leaders in fundamental and applied ocean research and exploration anywhere. WHOI is known for its multidisciplinary approach, superior ship operations, and unparalleled deep-sea robotics capabilities. We play a leading role in ocean observation and operate the most extensive suite of ocean data-gathering platforms in the world. Top scientists, engineers, and students collaborate on more than 800 concurrent projects worldwide—both above and below the waves—pushing the boundaries of knowledge to inform people and policies for a healthier planet. Learn more at whoi.edu.

 

  

The James Cook Royal Research Vessel was used to deploy and recover the ocean bottom seismometers.

Credit

(Credit: Stephen Hick, U. College London)