Sunday, December 18, 2022

Experts in insect taxonomy “threatened by extinction” reveals the first European Red List of Taxonomists

Expertise tends to be particularly poor in the countries with the richest biodiversity, while taxonomists are predominantly male and ageing

Peer-Reviewed Publication

PENSOFT PUBLISHERS

European Red List of Insect Taxonomists 

IMAGE: EUROPEAN RED LIST OF INSECT TAXONOMISTS, COVER. ILLUSTRATION: FRAGRANT BUMBLE BEE (BOMBUS FRAGRANS) BY DENITSA PENEVA. view more 

CREDIT: DENITSA PENEVA

While insect populations continue to decline, taxonomic expertise in Europe is at serious risk, confirms data obtained within the European Red List of Insect Taxonomists, a recent study commissioned by the European Union (EU). 

Scientists who specialise in the identification and discovery of insect species - also known as insect taxonomists - are declining across Europe, highlights the newly released report by CETAF, International Union for Conservation of Nature (IUCN) and Pensoft. The authors of this report represent different perspectives within biodiversity science, including natural history and research institutions, nature conservation, academia and scholarly publishing.

Despite the global significance of its taxonomic collections, Europe has been losing taxonomic expertise at such a rate that, at the moment nearly half (41.4%) of the insect orders are not covered by a sufficient number of scientists. If only EU countries are counted, the number looks only slightly more positive (34.5%). Even the four largest insect orders: beetles (Coleoptera), moths and butterflies (Lepidoptera), flies (Diptera) and wasps, bees, ants and sawflies (Hymenoptera) are only adequately ‘covered’ in a fraction of the countries.

To obtain details about the number, location and productivity of insect taxonomists, the team extracted information from thousands of scientific articles published in the last decade, queried the most important scientific databases and reached out to over fifty natural science institutions and their networks. Furthermore, a dedicated campaign reached out to individual researchers through multiple communication channels. As a result, more than 1,500 taxonomists responded by filling in a self-declaration survey to provide information about their personal and academic profile, qualification and activities. 

Then, the collected information was assessed against numerical criteria to classify the scientists into categories similar to those used by the IUCN Red List of Threatened SpeciesTM. In the European List of Insect Taxonomists, these range from Eroded Capacity (equivalent to Extinct) to Adequate Capacity (equivalent to Least Concern). The assessment was applied to the 29 insect orders (i.e. beetles, moths and butterflies, etc.) to figure out which insect groups the society, conservation practitioners and decision-makers need not be concerned at this point.

On a country level, the results showed that Czechia, Germany and Russia demonstrate the most adequate coverage of insect groups. Meanwhile, Albania, Azerbaijan, Belarus, Luxembourg, Latvia, Ireland and Malta turned out to be the ones with insufficient number of taxonomists.

In most cases, the availability of experts seems to correlate to GDP, as wealthiest countries tend to invest more in their scientific institutions. What is particularly worrying is that the lack of taxonomic expertise is more evident in the countries with the greatest species diversity. This trend may cause even more significant problems in the knowledge and conservation of these species, further aggravating the situation. Thus, the report provides further evidence about a global pattern where the countries richest in biodiversity are also the ones poorest in financial and human resources. 

The research team also reminds that it is European natural history museums that host the largest scientific collections - including insects - brought from all over the globe. As such, Europe is responsible to the world for maintaining taxonomic knowledge and building adequate expert capacity.

Other concerning trends revealed in the new report are that the community of taxonomists is also ageing and - especially in the older groups - male-dominated (82%). 

“One reason to have fewer young taxonomists could be due to limited opportunities for professional training (...), and the fact that not all professional taxonomists provide it, as a significant number of taxonomists are employed by museums and their opportunities for interaction with university students is probably not optimal.” comments Ana CasinoCETAF’s Executive Director. “Gender bias is very likely caused by multiple factors, including fewer opportunities for women to be exposed to taxonomic research and gain an interest, unequal offer of career opportunities and hiring decisions,” according to the authors. “A fair-playing field for all genders will be crucial to address these shortcomings and close the gap.”

***

The European Red List of Taxonomists concludes with practical recommendations concerning strategic, science and societal priorities, addressed to specific decision-makers. The authors give practical examples and potential solutions in support of their call to action.

For instance, in order to develop targeted and sustainable funding mechanisms to support taxonomy, they propose the launch of regular targeted Horizon Europe calls to study important insect groups for which taxonomic capacity has been identified to be at a particularly high risk of erosion.

To address specific gaps in expertise - such as the ones reported in the publication from Romania - a country known for its rich insect diversity, yet poor in taxonomic expertise - the consortium proposes the establishment of a natural history museum or entomological research institute that is well-fitted to serve as a taxonomic facility.

Amongst the scientific recommendations, the authors propose measures to ensure better recognition of taxonomic work at a multidisciplinary level. The scientific community, including disciplines that use taxonomic research, such as molecular biology, medicine and agriculture - need to embrace universal standards and rigorous conduct for the correct citation of scientific publications by insect taxonomists.

Societal engagement is another important call. “It is pivotal to widely raise awareness of the value and impact of taxonomy and the work of taxonomists. We must motivate young generations to join the scientific community” points Prof. Lyubomir Penev, Managing Director of Pensoft.

***

Understanding taxonomy is a key to understanding the extinction risk of speciesIf we strategically target the gaps in expert capacity that this European Red List identifies, we can better protect biodiversity and support the well-being and livelihoods of our societies. With the climate crisis at hand, there is no time left to waste,” added David Allen from the IUCN Red List team.

As a dedicated supporter of the IUCN Red List, I am inspired by this call to strengthen the capacity, guided by evidence and proven scientific methods. However, Europe has much more scientific capacity than most biodiversity-rich regions of the world. So, what this report particularly highlights is the need for massively increasing investment in scientific discovery, and building taxonomic expertise, around the world,” said Jon Paul Rodríguez, Chair of the IUCN Species Survival Commission

***

The results of the study will be presented at the UN Biodiversity Conference (COP-15) on 15 December within a side event (#4788) dedicated to the role of taxonomy for the implementation and monitoring of the Post-2020 Biodiversity Framework. 

***

Follow and join the conversation on Twitter using the #RedListTaxonomists hashtag. 

 

Additional information:

CETAF is the European organisation of Natural History Museums, Botanic Gardens and Research Centers with their associated natural science collections comprising 74 of the largest taxonomic institutions from 24 European countries (19 EU, 2 EEA and 3 non-EU), gathering expertise of more than 5,000 researchers. Their collections contain a wide range of specimens including animals, plants, fungi and rocks, and genetic resources which are used for scientific research and exhibitions. CETAF aims to promote training, research collaborations and understanding in taxonomy and systematic biology as well as to facilitate access to our natural heritage by sharing the information derived from the collections. Follow CETAF on TwitterFacebook and LinkedIn

IUCN (the International Union for Conservation of Nature) is a membership Union composed of both government and civil society organisations. It harnesses the experience, resources and reach of its more than 1,400 Member organisations and the input of more than 15,000 experts. IUCN is the global authority on the status of the natural world and the measures needed to safeguard it. 

Through its Species Survival Commission (SSC), IUCN assists societies to conserve biodiversity by building knowledge on the status and threats to species, providing advice, developing policies and guidelines, facilitating conservation planning, and catalysing conservation action. Follow IUCN on TwitterFacebook and LinkedIn.

Pensoft is an independent academic publishing company and technology provider, well known worldwide for its novel cutting-edge publishing tools, workflows and methods for text and data publishing of journals, books and conference materials. Through its Research and Technical Development department, the company is involved in various research and technology projects. Founded in 1992 "by scientists, for scientists" and initially focusing on book publishing, Pensoft is now a leading publisher of innovative open access journals in taxonomy and biodiversity science. Follow Pensoft on TwitterFacebook and LinkedIn.


Contacts:

Iva Boyadzhieva, Pensoft, Email: i.boyadzhieva@pensoft.net;

Alessandro Marchi, CETAF, Email: amarchi@naturalsciences.be;

Harriet Brooker, IUCN Global Communications, Email: press@iucn.org;

Aritzaith Rodríguez, IUCN SSC, Email: aritzaith.rodriguez@ssc.iucn.org,

Harnessing smartphones to track how people use green spaces

Anonymized GPS data could aid efforts to balance recreation and conservation in urban areas

Peer-Reviewed Publication

PLOS

Harnessing smartphones to track how people use green spaces 

IMAGE: A HIKER WALKING ALONG A TRAIL ON A SUMMER DAY IN HILTON FALLS CONSERVATION AREA. view more 

CREDIT: CONSERVATION HALTON, CC-BY 4.0, HTTPS://CREATIVECOMMONS.ORG/LICENSES/BY/4.0/)

A new study demonstrates how anonymized GPS data from people’s smartphones can be used to monitor the public’s use of parks and other green spaces in urban areas, which could help inform their management. Alessandro Filazzola of ApexRMS and the University of Toronto, Mississauga, Canada, and colleagues present these findings in the open-access journal PLOS Computational Biology on December 15, 2022.

Parks and other green spaces in urban areas perform several key functions, including promotion of human physical and mental health, preservation of ecosystem biodiversity, and services such as stormwater management and heat reduction. People’s interactions with green spaces influence these functions, but it is challenging to capture human activity at a fine enough resolution to inform green space management. Anonymized GPS data from people’s smartphones could help address this challenge.

To demonstrate such an approach, Filazzola and colleagues analyzed anonymized smartphone data that captured people’s visits to 53 green spaces in the greater Toronto area in Canada, including parks, trail systems, and areas closed to the public for conservation purposes.

They found that the GPS data did indeed capture insights about people’s use of these green spaces, showing, for instance, that mobile device activity was strongly correlated with data on reservations made by people to access parks. The data also revealed which areas within green spaces had more or less human activity, with established trails being particularly popular. In addition, greater human presence was linked to certain types of land cover, such as rock formations, as well as certain tree species.

These findings highlight the potential for anonymized GPS smartphone data to help inform management of green spaces, especially as cities grow worldwide. Such efforts could optimize the benefits of green spaces for people while also preserving biodiversity.

The researchers note several challenges to this approach, such as some people’s tendency to disconnect from the mobile devices when visiting green spaces and the difficulty of distinguishing between a smart phone located within a green space versus passing in a car just outside the perimeter. Future research could address these issues and refine the methodology.

The authors add: “Access to parks is important for city residents for recreation, connecting to nature, and socialization, but it’s challenging to understand how people use these green spaces. Our study is using anonymized mobility data to help shed light on relationship between people and nature in parks.”

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In your coverage, please use this URL to provide access to the freely available article in PLOS Computational Biologyhttps://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1010725

Citation: Filazzola A, Xie G, Barrett K, Dunn A, Johnson MTJ, MacIvor JS (2022) Using smartphone-GPS data to quantify human activity in green spaces. PLoS Comput Biol 18(12): e1010725. https://doi.org/10.1371/journal.pcbi.1010725

Author Countries: Canada

Funding: This research was funded by a Post-Doctoral Fellowship awarded to AF by the Center for Urban Environments and School of Cities at the University of Toronto, Canada. GX was funded by an Ontario Graduate Scholarship, a Center for Environmental Research in the Anthropocene Graduate Fellowship, and NSERC CREATE funding (# 401276521) awarded to JSM. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Study probes how plague spreads through wild rodent populations

Mathematical modeling revealed how fleas with early-stage Yersinia pestis infections are insufficient to drive epizootic outbreaks but can help promote a low level of enzootic plague.

Peer-Reviewed Publication

PLOS

Study probes how plague spreads through wild rodent populations 

IMAGE: OROPSYLLA MONTANA (A GROUND SQUIRREL FLEA) INFECTED AND BLOCKED WITH YERSINIA PESTIS. view more 

CREDIT: MITCHELL ET AL, CC-BY 4.0, HTTPS://CREATIVECOMMONS.ORG/LICENSES/BY/4.0/)

Scientists have long been puzzled how the bubonic plague bacteria, Yersinia pestis, can cause both stable, enzootic disease among rodents, as well as sudden, lethal epizootic outbreaks that decimate the same rodent populations. A new study concludes that the difference might relate to the fleas that carry Y. pestis between animals. Fleas with only early-phase infection are insufficient to drive an epizootic among most wild rodents, and favor a more stable enzootic state, according to the research published this week in PLOS Pathogens by Joseph Hinnebusch of the National Institute of Allergy and Infections Diseases Rocky Mountain Laboratories, U.S., and colleagues.

Plague primarily afflicts rodents, including rats, mice, gerbils, squirrels, marmots and prairie dogs. The bacteria circulate within these host populations through several flea vector species. Fleas can transmit Y. pestis in different stages following an infectious blood meal; transmission can occur the very next time they feed, a phenomenon referred to as early-phase transmission. Later, “blockage-dependent transmission” occurs after Y. pestis forms a bacterial biofilm in the fleas’ digestive systems, blocking the flow of an incoming meal and causing blood to recoil back into the bite site after mixing with the biofilm.

In the new study, researchers for the first time empirically evaluated the relative efficiency of the different phases of transmission by individual fleas. Cohorts of a ground squirrel flea, Oropsylla montana, were infected by feeding on mouse or rat blood infected with Y. pestis. Transmission efficiency of individual O. montana fleas was then measured over a four-week period and the researchers created models to show how this efficiency would translate to the spread of Y. pestis through a rodent population.

The results indicated that blockage-dependent transmission is much more efficient than early-phase transmission, in terms of the probability of transmission, the number of bacteria transmitted, and the capability of driving an epizootic outbreak. Early-phase transmission, the models showed, could drive an epizootic only in naïve, very susceptible host populations and when the flea burden is high. Moreover, the low dose of bacteria typically transmitted in early-phase transmission may “immunize” many individuals, acting to promote an enzootic state.

“Our models suggest that exposure of most wild rodents to sublethal, immunizing doses of Y. pestis transmitted during the early phase may ameliorate rapid epizootic spread by reducing the number of susceptible individuals in the population,” the authors say. “In many situations early-phase transmission may be more important in maintaining the enzootic state than in driving an epizootic.”

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In your coverage, please use this URL to provide access to the freely available article in PLOS Pathogenshttp://journals.plos.org/plospathogens/article?id=10.1371/journal.ppat.1010996

Citation: Mitchell CL, Schwarzer AR, Miarinjara A, Jarrett CO, Luis AD, Hinnebusch BJ (2022) A Role for Early-Phase Transmission in the Enzootic Maintenance of Plague. PLoS Pathog 18(12): e1010996. https://doi.org/10.1371/journal.ppat.1010996

Author Countries: USA

Funding: This research was funded by the Intramural Research Program of the NIH (to BJH), NIAID (ZIA AI000796-25) and by the National Science Foundation (2109828 to ADL). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Herpes vaccines could mean billions of dollars of cost savings and prevent the loss of millions of quality of life years by reducing HSV-2 infections and HSV-2 driven HIV infections, according to a modelling study in 90 low and middle income countries


Peer-Reviewed Publication

PLOS

In your coverage, please use this URL to provide access to the freely available paper in PLOS Medicine: http://journals.plos.org/plosmedicine/article?id=10.1371/journal.pmed.1003938

Article Title: Estimated economic burden of genital herpes and HIV attributable to herpes simplex virus type 2 infections in 90 low- and middle-income countries: A modeling study

Author Countries: United States, Qatar

Funding: HHA acknowledges the joint support of Qatar University and Marubeni M-QJRC-2020-5. LJA acknowledges the support of NPRP grant number 9-040-3-008 from the Qatar National Research Fund (a member of Qatar Foundation). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

8 Million Popular Cleaning Products Recalled Over Bacterial Contamination Concern

Story by Shannen Zitz • 

Everything to Know About FDA Recalls

The Laundress has recalled approximately eight million units of cleaning products over bacterial contamination.

Burkholderia cepacia complex, Klebsiella aerogenes, and various species of Pseudomonas were discovered in the products.

Those with affected products should stop use immediately and follow appropriate disposal instructions.

On December 1st, The Laundress announced a voluntary recall of millions of household cleaning products due to bacterial contamination. The brand made the announcement via an Instagram post and is in cooperation with the U.S. Consumer Product Safety Commission (CPSC) and Health Canada.

The recalled products, which include various lots of all of the brand’s laundry and cleaning products, may contain a variety of bacteria, “including Burkholderia cepacia complex, Klebsiella aerogenes, and multiple different species of Pseudomonas,” according to the CPSC. Those with weakened immune systems, external medical devices, and underlying lung conditions who are exposed to the bacteria face a serious risk of infection that could require medical treatment. The bacteria can enter the body through the eyes, breaks in the skin, or if inhaled. Symptoms of these types of bacteria include fever, chills, serious upper respiratory infections to no symptoms at all, and vary based on each type. People with healthy immune systems are usually not affected by the bacteria, per the CPSC.


The Laundress voluntarily recalled around eight million units of laundry and cleaning products after multiple different species of bacteria were detected.
© Evgeniia Siiankovskaia - Getty Images

The recalled products are:

Products with lot codes that begin with the letter F and the last four digits are numbered 9354 or lower
Products with lot codes that begin with the letter H and the last four digits are numbered 2262 or lower
Products with lot codes that begin with the letter T and the last four digits are numbered 5264 or lower


The products were sold at TheLaundress.com, Amazon.com, Target, Bloomingdales, The Container Store, and other major retailers through September 2022, per the CPSC.

Anybody with contaminated products should immediately stop using and “dispose of the product by closing the bottle tightly and placing it in household trash,” The Laundress explained. “Do not empty the product prior to disposal.”

The company shared information about the recall with their customers today, urging those with affected products to cease use and navigate to their website (www.TheLaundressRecall.com) for more information about refunds, specific products involved in the recall, and product disposal.



The brand took to social media to delve a bit deeper into what happened. “We deeply apologize to all our loyal customers for this situation,” the brand wrote. “We are undertaking decisive steps with our suppliers to ensure production processes meet our safety and quality standards. Sincerely, The Laundress Team.”

Their announcement on Instagram followed a string of other updates from the brand regarding product safety beginning two weeks before the official recall. On November 17, the brand posted a “safety notice” warning customers of the “potential presence of elevated levels of bacteria in some of our products that present a safety concern.” The CPSC noted at the time of their press release that there are 11 customers who have reported Pseudomonas infections, which are under investigation for connection to the recalled products.

On November 19th, the brand posted an update, noting the creation of an FAQ page for concerns related to the recall, writing: “We are working hard to provide as much clarity to you as possible and we understand the concerns you may feel as we await answers.”

Customers were understandably upset about the safety issues and the brand’s slowness in providing information. “This is really alarming,” one customer commented on the brand’s Instagram post announcing the recall. “I love your products but to have this kind of issue with products that are so expensive and then such a vague safety notice?”

Another added: “The more I think about this the more infuriated I become. The Laundress is the only detergent I have ever used on my 15-month-old daughter’s clothes, blankets, towels, etc. At the price points we pay for these ‘luxury’ products, this is absolutely something we should never, EVER have to worry about.”

If you have questions about the recall or would like to request reimbursement for the purchase of the affected product, you can visit The Laundress’ voluntary recall website or email the company at customerservice@thelaundress.com.

Talk to your physician if you have any health concerns related to using the product involved in the recall.

The monkeypox virus DNA-synthesizing machine

Peer-Reviewed Publication

AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE (AAAS)

Using cryo-microscopy, researchers present a high-resolution structure of monkeypox virus DNA polymerase holoenzyme, a complex that plays a key role in the genome replication process of the virus. The findings reveal the mechanism that underlies monkeypox virus genome replication and could be used to guide the development of antiviral drugs. In July 2022, the World Health Organization declared monkeypox virus (MPXV) as a public health emergency of international concern and, as of early December 2022, more than 82,000 human monkeypox cases have been confirmed in 110 countries worldwide. New preventative and therapeutic measures against this virus are needed. In this study, Qi Peng and colleagues used cryo-electron microscopy to determine a high-resolution structure of the monkeypox virus DNA polymerase holoenzyme. According to the findings, the holoenzyme possesses an architecture that indicates a “forward sliding clamp” mechanism for DNA replication. The authors suggest that this finding could be leveraged to design anti-poxvirus drugs.

Prolonged geographic separation in ecologically similar environments can drive new species

Peer-Reviewed Publication

AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE (AAAS)

Trait data from more than 1,000 different vertebrate species suggests that new species often arise not because of pressures from different environments, but because of prolonged geographic separation in ecologically similar environments. The findings contrast the classical view of divergent adaptation as the dominant driver of early speciation. While it is widely agreed upon that most speciation events require an allopatric phase – a period in which a species population becomes geographically separated long enough to have it diverge into a distinct new species – whether ecological divergence drives this critical allopatric phase is unknown. To better understand the role divergent ecological adaptation plays in allopatric speciation, Sean Anderson and Jason Weir combined new data from 129 allopatric sister pairs of bird species (speciating or recently speciated taxa) with 14 other published allopatric sister pair datasets for various other birds, mammals and amphibian species. They used the trait data to model the relative contribution of divergence adaptation to allopatric divergence. Anderson and Weir discovered that divergent ecological adaptation is a relatively minor force during allopatric divergence and that most species tend to evolve under similar selective pressures. “Using new models to analyze sister-pair trait differences, we find that adaptive ecological divergence to be the exception rather than the rule in vertebrates,” write the authors. “This result contradicts the classical idea that divergent adaptation initiates the earliest stages of speciation, and it supports an emerging picture in which new species commonly arise despite minimal ecological divergence.”

A call to designate World Heritage Environmental Datasets

Data longevity & accessibility are essential to understanding global change

Reports and Proceedings

CARY INSTITUTE OF ECOSYSTEM STUDIES

Weir at Hubbard Brook Experimental Forest 

IMAGE: WEIR AT HUBBARD BROOK EXPERIMENTAL FOREST IN THE WHITE MOUNTAINS OF NEW HAMPSHIRE. view more 

CREDIT: CLAIRE NEMES

“Some environmental datasets are so integral to our understanding of the world around us and our place in it that leaving their continuation to the vagaries of fate or government funding cycles is illogical and irresponsible.”  So reports a Letter, published today in Science by a team of leading ecologists calling for the designation of World Heritage Datasets. 

Long-term datasets such as CO2 measurements at Mauna Loa Observatory in Hawaii (Keeling Curve), cherry blossom dates in Kyoto, Japan, and precipitation and stream water chemistry at Hubbard Brook in New Hampshire have provided information vital to science-based environmental policy, resource management, and climate change adaptation. But the future of these and other vital datasets hangs in the balance due to funding threats and weak support infrastructure. 

The authors note that “high-impact, long-term datasets that document our changing environment are a part of our cultural heritage,” and “by establishing the value of long-term environmental records, World Heritage designation would help secure funds, ensure data longevity and accessibility, and encourage the creation of new datasets of significance for understanding global change.”

 

Authors of the letter include:

Emma J. Rosi, Cary Institute of Ecosystem Studies, Millbrook, NY

Emily S. Bernhardt, Dept. of Biology, Duke University, Durham, NC

Christopher T.  Solomon, Cary Institute of Ecosystem Studies, Millbrook, NY

Gene E. Likens, Cary Institute of Ecosystem Studies, Millbrook, NY; Institute of the Environment, University of Connecticut, Storrs, CT

William. H. McDowell, Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH

Irena F. Creed, Department of Physical and Environmental Sciences, University of Toronto, Toronto

Corresponding author Emma J. Rosi - rosie@caryinstitute.org


  

Disclaimer: A

PHILOSOPHERS STONE

Dynamical fractal discovered in clean magnetic crystal

Peer-Reviewed Publication

UNIVERSITY OF CAMBRIDGE

Example of the fractal structures in spin ice together with a famous example of a fractal (the Mandelbrot set), on top of a photograph of water ice. 

IMAGE: EXAMPLE OF THE FRACTAL STRUCTURES IN SPIN ICE TOGETHER WITH A FAMOUS EXAMPLE OF A FRACTAL (THE MANDELBROT SET), ON TOP OF A PHOTOGRAPH OF WATER ICE. view more 

CREDIT: JONATHAN N. HALLÉN, CAVENDISH LABORATORY, UNIVERSITY OF CAMBRIDGE

The nature and properties of materials depend strongly on dimension. Imagine how different life in a one-dimensional or two-dimensional world would be from the three dimensions we’re commonly accustomed to. With this in mind, it is perhaps not surprising that fractals – objects with fractional dimension – have garnered significant attention since their discovery. Despite their apparent strangeness, fractals arise in surprising places – from snowflakes and lightning strikes to natural coastlines.

Researchers at the University of Cambridge, the Max Planck Institute for the Physics of Complex Systems in Dresden, the University of Tennessee, and the Universidad Nacional de La Plata have uncovered an altogether new type of fractal appearing in a class of magnets called spin ices. The discovery was surprising because the fractals were seen in a clean three-dimensional crystal, where they conventionally would not be expected. Even more remarkably, the fractals are visible in dynamical properties of the crystal, and hidden in static ones. These features motivated the appellation of "emergent dynamical fractal".

The fractals were discovered in crystals of the material dysprosium titanate, where the electron spins behave like tiny bar magnets. These spins cooperate through ice rules that mimic the constraints that protons experience in water ice. For dysprosium titanate, this leads to very special properties.

Jonathan Hallén of the University of Cambridge is a PhD student and the lead author on the study. He explains that “at temperatures just slightly above absolute zero the crystal spins form a magnetic fluid.” This is no ordinary fluid, however.

“With tiny amounts of heat the ice rules get broken in a small number of sites and their north and south poles, making up the flipped spin, separate from each other traveling as independent magnetic monopoles.”

The motion of these magnetic monopoles led to the discovery here. As Professor Claudio Castelnovo, also from the University of Cambridge, points out: “We knew there was something really strange going on. Results from 30 years of experiments didn’t add up.”

Referring to a new study on the magnetic noise from the monopoles published earlier this year, Castelnovo continued, “After several failed attempts to explain the noise results, we finally had a eureka moment, realizing that the monopoles must be living in a fractal world and not moving freely in three dimensions, as had always been assumed.”

In fact, this latest analysis of the magnetic noise showed the monopole’s world needed to look less than three-dimensional, or rather 2.53 dimensional to be precise! Professor Roderich Moessner, Director of the Max Planck Institute for the Physics of Complex Systems in Germany, and Castelnovo proposed that the quantum tunneling of the spins themselves could depend on what the neighboring spins were doing.

As Hallén explained, “When we fed this into our models, fractals immediately emerged. The configurations of the spins were creating a network that the monopoles had to move on. The network was branching as a fractal with exactly the right dimension.”

But why had this been missed for so long?

Hallén elaborated that, “this wasn’t the kind of static fractal we normally think of. Instead, at longer times the motion of the monopoles would actually erase and rewrite the fractal.”

This made the fractal invisible to many conventional experimental techniques.

Working closely with Professors Santiago Grigera of the Universidad Nacional de La Plata, and Alan Tennant of the University of Tennessee, the researchers succeeded in unravelling the meaning of the previous experimental works.

 “The fact that the fractals are dynamical meant they did not show up in standard thermal and neutron scattering measurements,” said Grigera and Tennant. “It was only because the noise was measuring the monopoles motion that it was finally spotted.”

As regards the significance of the results, which appear in Science this week, Moessner explains: “Besides explaining several puzzling experimental results that have been challenging us for a long time, the discovery of a mechanism for the emergence of a new type of fractal has led to an entirely unexpected route for unconventional motion to take place in three dimensions.”

Overall, the researchers are interested to see what other properties of these materials may be predicted or explained in light of the new understanding provided by their work, including ties to intriguing properties like topology. With spin ice being one of the most accessible instances of a topological magnet, Moessner said, “the capacity of spin ice to exhibit such striking phenomena makes us hopeful that it holds promise of further surprising discoveries in the cooperative dynamics of even simple topological many-body systems.”.


 [PP1]Reference perhaps?

One is the loneliest number: game theory shows why sexual misconduct is underreported

Peer-Reviewed Publication

UNIVERSITY OF TORONTO, ROTMAN SCHOOL OF MANAGEMENT

Prof. Ing-Haw Cheng 

IMAGE: ING-HAW CHENG IS AN ASSOCIATE PROFESSOR OF FINANCE AT ATHE UNIVERSITY OF TORONTO'S ROTMAN SCHOOL OF MANAGEMENT. HE RESEARCHES HOW BELIEFS AND INCENTIVES AFFECT CAPITAL MARKETS AND THE ECONOMY. RECENT WORK INCLUDES STUDIES OF VOLATILITY AND COMMODITY DERIVATIVES MARKETS, THE IMPACT OF COVID-19 AND THE 2008 GREAT FINANCIAL CRISIS ON MARKETS, AND NEW AND EMERGING TOPICS IN ECONOMICS AND FINANCE. view more 

CREDIT: ROTMAN SCHOOL OF MANAGEMENT

Toronto - The idea that there’s safety in numbers was a major driver behind the #MeToo movement, which encouraged people who had been targets of sexual misconduct to come forward.

While there have been many heated debates about why people who have experienced abuse don’t report, a pair of economists used their academic discipline’s tools to dispassionately explain why underreporting is at its highest when misconduct is widespread, and why awareness-raising campaigns like #MeToo can help.

“There are real economic reasons why people don’t come forward,” says Ing-Haw Cheng, an associate professor of finance at the University of Toronto’s Rotman School of Management who co-authored the research with Alice Hsiaw of Brandeis University.

The pair built a model of the decision to report using game theory, which applies mathematics to represent situations where the outcome for each individual’s decision is affected by everybody else’s choices.

In an environment where sexual misconduct by one or more individuals is an open secret, those who have been their targets face uncertainty over whether others will come forward. If one person chooses to report misconduct, they do not know if their information will be backed by other reports, or if it will be an outlier, weakening their credibility and making them vulnerable to reprisals. In the language of game theory, the complainant who sticks their neck out to report faces a “first mover disadvantage,” with significant potential costs.

"Uncertainty over whether others will come forward can be so strong enough that no one will report even when misconduct is widespread, creating a 'culture of silence',” says Prof. Cheng.

Reporting improves when individuals are aware that other reports have been made, when problematic behaviour is penalized, or when people who have been targeted by sexual misconduct receive damage awards, such as through a lawsuit, the model shows.

However, it also shows that movements like #MeToo can have unintended consequences, something Prof. Cheng says are unavoidable. As awareness of sexual misconduct rises, some managers choose not to act as mentors to junior employees. If those managers have a tendency towards misconduct, it reduces the number of incidents and the number of reports, leading once again to reluctance to report. If the managers who shy away from mentoring behave ethically, junior employees lose out by not having access to good mentors.

Some organizations attempt to deal with the uncertainty hurdle through a “holding tank” system where misconduct reports are received and held confidentially, but only acted on once there are multiple complaints for an individual. However, the researchers found that the approach does not always help because complainants may again be unsure whether their report will lead to action.

The findings are useful for understanding how to overcome the culture of silence that prevents people from speaking up when they see behaviour that runs counter to a group or organization’s rules, ethics or values.

“A model in economics provides a chain of logic that rests on a set of assumptions,” says Prof. Cheng. “We can use this as a basis for a sensible conversation in an emotionally charged topic.”

The paper appears in the November issue of American Economic Journal: Microeconomics.

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