Tuesday, December 01, 2020

CU Anschutz researcher offers new theory on `Venus' figurines

Investigators say humanity's oldest sculptures may be linked to climate change, diet

UNIVERSITY OF COLORADO ANSCHUTZ MEDICAL CAMPUS

Research News

AURORA, Colo. (Dec. 1, 2020) - One of world's earliest examples of art, the enigmatic `Venus' figurines carved some 30,000 years ago, have intrigued and puzzled scientists for nearly two centuries. Now a researcher from the University of Colorado Anschutz Medical Campus believes he's gathered enough evidence to solve the mystery behind these curious totems.

The hand-held depictions of obese or pregnant women, which appear in most art history books, were long seen as symbols of fertility or beauty. But according to Richard Johnson, MD, lead author of the study published today in the journal, Obesity, the key to understanding the statues lays in climate change and diet.

"Some of the earliest art in the world are these mysterious figurines of overweight women from the time of hunter gatherers in Ice Age Europe where you would not expect to see obesity at all," said Johnson, a professor at the University of Colorado School of Medicine specializing in renal disease and hypertension. "We show that these figurines correlate to times of extreme nutritional stress."

Early modern humans entered Europe during a warming period about 48,000 years ago. Known as Aurignacians, they hunted reindeer, horses and mammoths with bone-tipped spears. In summer they dined on berries, fish, nuts and plants. But then, as now, the climate did not remain static.

As temperatures dropped, ice sheets advanced and disaster set in. During the coldest months, temperatures plunged to 10-15 degrees Celsius. Some bands of hunter gatherers died out, others moved south, some sought refuge in forests. Big game was overhunted.

It was during these desperate times that the obese figurines appeared. They ranged between 6 and 16 centimeters in length and were made of stone, ivory, horn or occasionally clay. Some were threaded and worn as amulets.

Johnson and his co-authors, Professor (ret.) of Anthropology John Fox, PhD, of the American University of Sharjah in the United Arab Emirates, and Associate Professor of Medicine Miguel Lanaspa-Garcia, PhD, of the CU School of Medicine, measured the statues' waist-to-hip and waist-to-shoulder ratios. They discovered that those found closest to the glaciers were the most obese compared to those located further away. They believe the figurines represented an idealized body type for these difficult living conditions.

"We propose they conveyed ideals of body size for young women, and especially those who lived in proximity to glaciers," said Johnson, who in addition to being a physician has an undergraduate degree in anthropology. "We found that body size proportions were highest when the glaciers were advancing, whereas obesity decreased when the climate warmed and glaciers retreated."

Obesity, according to the researchers, became a desired condition. An obese female in times of scarcity could carry a child through pregnancy better than one suffering malnutrition. So the figurines may have been imbued with a spiritual meaning - a fetish or magical charm of sorts that could protect a woman through pregnancy, birth and nursing.

Many of the figurines are well-worn, indicating that they were heirlooms passed down from mother to daughter through generations. Women entering puberty or in the early stages of pregnancy may have been given them in the hopes of imparting the desired body mass to ensure a successful birth.

"Increased fat would provide a source of energy during gestation through the weaning of the baby and as well as much needed insulation," the authors said.

Promoting obesity, said Johnson, ensured that the band would carry on for another generation in these most precarious of climatic conditions.

"The figurines emerged as an ideological tool to help improve fertility and survival of the mother and newborns," Johnson said. "The aesthetics of art thus had a significant function in emphasizing health and survival to accommodate increasingly austere climatic conditions."

The team's success in amassing evidence to support its theory came from applying measurements and medical science to archaeological data and behavioral models of anthropology.

"These kinds of interdisciplinary approaches are gaining momentum in the sciences and hold great promise," Johnson said. "Our team has other subjects of Ice Age art and migration in its research sights as well."

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About the University of Colorado Anschutz Medical Campus

The University of Colorado Anschutz Medical Campus is a world-class medical destination at the forefront of transformative science, medicine, education, and healthcare. The campus encompasses the University of Colorado health professional schools, more than 60 centers and institutes, and two nationally ranked hospitals that treat more than 2 million adult and pediatric patients each year. Innovative, interconnected and highly collaborative, together we deliver life-changing treatments, patient care, professional training, and conduct world-renowned research powered by more than $500 million in research awards. For more information, visit https://www.cuanschutz.edu

 

Cannabidiol (CBD) in cannabis does not impair driving, landmark study shows

Research shows cannabidiol safe for driving and THC effects fade in hours

UNIVERSITY OF SYDNEY

Research News

IMAGE

IMAGE: VEHICLE USED TO TEST CANNABIS IMPACT ON DRIVING. TESTS HAPPENED ON PUBLIC ROADS UNDER CONTROLLED CONDITIONS IN THE NETHERLANDS WITH MAASTRICHT UNIVERSITY. view more 

CREDIT: MAASTRICHT UNIVERSITY

A landmark study on how cannabis affects driving ability has shown that cannabidiol (CBD), a cannabis component now widely used for medical purposes, does not impair driving, while moderate amounts of the main intoxicating component tetrahydrocannabinol (THC) produce mild driving impairment lasting up to four hours.

The study was led the Lambert Initiative for Cannabinoid Therapeutics at the University of Sydney and conducted at Maastricht University in the Netherlands. It was published today in the prestigious Journal of the American Medical Association.

Lead author Dr Thomas Arkell said: "These findings indicate for the first time that CBD, when given without THC, does not affect a subject's ability to drive. That's great news for those using or considering treatment using CBD-based products."

There has been substantial growth in medical treatment using cannabis-related products in Australia and overseas. This includes increasing use of CBD-containing products for conditions such as epilepsy, anxiety, chronic pain and addictions. Many currently available products also contain a mixture of THC and CBD.

The research involved people inhaling vaporised cannabis containing different mixes of THC and CBD, then going for a 100-kilometre drive under controlled conditions on public highways both 40 minutes and four hours later. Cannabis containing mainly CBD did not impair driving while cannabis containing THC, or a THC/CBD mixture, caused mild impairment measured at 40 minutes later but not after four hours.

Dr Arkell said: "With cannabis laws changing globally, jurisdictions are grappling with the issue of cannabis-impaired driving. These results provide much needed insights into the magnitude and duration of impairment caused by different types of cannabis and can help to guide road-safety policy not just in Australia but around the world".

"Road safety is a primary concern," Dr Arkell said. "These results should allow for evidence-based laws and regulation for people receiving medical cannabis."

The Academic Director of the Lambert Initiative, Professor Iain McGregor, said: "We were delighted to have the opportunity to collaborate with Professor Jan Ramaekers and his team on this study. Studying the effects of cannabis on driving with such precision in a real-world context is incredibly important.

"The results should reassure people using CBD-only products that they are most likely safe to drive, while helping patients using THC-dominant products to understand the duration of impairment."


CAPTION

Lead author Dr Thomas Arkell from the Lambert Initiative for Cannabinoid Therapeutics.

METHOD

The study involved giving 26 healthy participants four different types of cannabis in a random order to vaporise on four separate occasions. Each participant's driving performance was then assessed on the road in real-world conditions along a 100-kilometre stretch of public highway in a dual control car with a driving instructor present.

The tests were done at Maastricht University in the Netherlands using a well-established scientific test that measures standard deviation of vehicle position (SDLP), an index of lane weaving, swerving and overcorrecting. SDLP increases under the influence of alcohol and drugs such as Valium and Stilnox.

Participants vaporised cannabis containing mainly THC, mainly CBD, THC and CBD in combination, or placebo cannabis (no active components). The amount of THC vaporised by participants was enough to cause strong feelings of intoxication.

To test how the different types of cannabis affect driving, participants completed two one-hour, on-road highway driving tests commencing at 40 minutes and at four hours after inhaling vaporised cannabis.

Professor McGregor said: "With rapidly changing attitudes towards medical and non-medical use of cannabis, driving under the influence of cannabis is emerging as an important and somewhat controversial public health issue.

"While some previous studies have looked at the effects of cannabis on driving, most have focused on smoked cannabis containing only THC (not CBD) and have not precisely quantified the duration of impairment.

"This is the first study to illustrate the lack of CBD effects on driving and to also provide a clear indication of the duration of THC impairment."

CAPTION

Professor Iain McGregor is Academic Director at the Lambert Initiative for Cannabinoid Therapeutics. 

DOWNLOAD the paper, research images and photos of the researchers at this link.

DOWNLOAD b-roll footage that recreates test conditions and lab tests at this link.

INTERVIEWS

Dr Thomas Arkell | Lead author | thomas.arkell@sydney.edu.au | +61 435 189 732

Professor Iain McGregor | iain.mcgregor@sydney.edu.au | +61 418 765 185

MEDIA ENQURIES

Marcus Strom | Media Adviser | marcus.strom@sydney.edu.au | +61 423 982 485

DECLARATION

This study was funded by the Lambert Initiative for Cannabinoid Therapeutics at the University of Sydney.

ABOUT THE LAMBERT INITIATIVE

The Lambert Initiative for Cannabinoid Therapeutics at the University of Sydney provides national and international leadership both in the science of medicinal cannabis and in the discovery and development of cannabis-based medicines.

It was established thanks to a philanthropic donation by Barry and Joy Lambert.

 

How smart cities can serve citizens

SINGAPORE MANAGMENT UNIVERSITY

Research News

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IMAGE: AT THE DENTONS RODYK DIALOGUE 2020, MINISTER FOR NATIONAL DEVELOPMENT DESMOND LEE JOINED A PANEL OF EXPERTS TO DISCUSS HOW DIGITALISATION CAN HELP TO TRANSFORM CITIES. view more 

CREDIT: SINGAPORE MANAGEMENT UNIVERSITY

SMU Office of Research & Tech Transfer - Although cities and urban areas only make up a small proportion of the world's land mass, they are home to more than half the global population and that number is going to keep rising. As cities swell to capacity with more and more inhabitants, city planners have turned to technology to cope with the challenges that accompany urban density.

The role of digital technologies in overcoming urban development challenges have become even more apparent in the COVID-19 pandemic, said Mr Desmond Lee, Minister for National Development and Minister-in-charge of Social Services Integration.

"This pandemic has starkly shown us that we need to transform the way we design, build and maintain our city so that we move away from a heavy reliance on manpower and labour, [and that] the use of digital tools and technology has a potential to create good jobs and opportunities for Singaporeans," Minister Lee said.

Minister Lee was the guest of honour at the Dentons Rodyk Dialogue 2020, held online on 25 September 2020. A partnership between Singapore law firm Dentons Rodyk and Singapore Management University's (SMU) Centre for Cross-Border Commercial Law in Asia (CEBCLA), the yearly Dialogue serves as a forum for thought leaders to share ideas and interrogate key trends shaping the future. This year, the Dialogue explored the opportunities and challenges posed by the rise of global smart cities, and was moderated by Mr Philip Jeyaratnam, Global Vice Chair and ASEAN CEO, Dentons Rodyk.

Planning for people in Singapore and beyond

"Even before COVID-19, many cities including Singapore had already been striving to deal with increasingly complex and global problems," Minister Lee said. "We have harnessed data and digital tools to better plan and design urban Singapore, and make our city more green, livable and sustainable."

Some of the technologies Singapore has employed to overcome the challenges of living in a densely populated city state includes the Housing & Development Board's (HDB) Smart Hub, a central data repository which acts as a 'brain' for municipal operations to help HDB's planners better understand the usage patterns of common amenities.

HDB also uses environmental modelling tools and computer simulations to analyse wind flow, solar heat and noise within towns to design and position homes in a manner that conserves energy and optimises resident comfort. "Singapore is an equatorial and very densely urban country, and these technologies can bring about real benefits," said Minister Lee.

These benefits are a topic of particular interest to SMU President Professor Lily Kong, a social scientist who has studied the impact of technologies in smart cities on their inhabitants' lives. In her keynote presentation, Professor Kong explained how the ASEAN Smart Cities Network (ASCN), a network of 26 cities established in 2018 to foster cooperation on smart city development, could best promote the use of smart technologies as a method of city management.

Considering the challenges

While it is tempting to think that digital solutions could be a panacea for problems caused by rapid urbanisation and urban density, it may be necessary to get a deeper understanding of the challenges involved, she said.

"There is the antecedent challenge, the issue of divergent infrastructural developments, privatisation and formalisation of city spaces, power and inequality, vertical and horizontal integration, and the balance between speed and efficacy," said Professor Kong. "These challenges are rooted largely in a single danger - that we forget that cities are not passive backdrops for digital technologies," she said.

In explaining each of the challenges, Professor Kong also stressed the importance of not neglecting material infrastructure development in favour of its digital counterparts. "Efficient bus timetables and smart traffic lights are no substitute for wider roads and fewer potholes," she explained, adding that overemphasising digital development could distract from material improvements and exacerbate existing inequalities.

"Nothing as powerful as technology can be implemented without some impact," added the next speaker, Ms Chantal Bernier, National Practice Leader, Privacy and Cybersecurity at Dentons Canada. "Many of these digital innovations are predicated upon the use of personal information, which is where privacy law is engaged."

While governments are allowed to process personal data without consent when it is necessary, Ms Bernier said that the possibilities afforded by current data collection methods are so immense and varied that the line between necessary to collect and simply convenient have started to blur. According to privacy laws, personal data collected for one purpose cannot be used for another purpose; however, there have been examples of government technology being used by third parties without consent.

"During the London 2012 Olympics, one of the security measures introduced was smart bins with the capacity to push notifications of security alerts to devices of people passing by," she explained. "That was certainly a laudable objective - except that in 2013 it was discovered that a private sector actor was using it to push advertisements, which is inconsistent with the reasons why the bins had been put in."

"Go slow and go small"

Privacy concerns aside, another key consideration for smart city technologies is that they should be inclusive, said Minister Lee. "In our anxiety to go digital, we should not leave behind a whole generation of citizens," he said, sharing the example of a 90-year-old man who requested for help but was directed to a website he was unable to read.

Agreeing, Professor Kong shared that the most important strategy for governments is to focus on the real needs of people. Such inclusive and critical thinking is key to ensure no segment of the population is left behind, she said.

"If we're not addressing fundamental issues in society, then introducing a form of tracking and formalisation actually exacerbates some of the challenges that the poor face," Professor Kong said, citing the example of how, in a particular Third World City context where smart technology was introduced, formal GPS tracking of garbage truck routes prevent their drivers from engaging in simultaneous work on the side to make ends meet.

But for all the challenges that may undermine the transition to smarter cities, there is still plenty of impetus for Singapore to push forward with its digitalisation efforts. "In the coming years, technology and digitalisation will play an even greater role in the life cycle of the urban built environment and infrastructure that we enjoy today," said Minister Lee. "Becoming a smart nation, making it a reality, and bringing everyone along with it, is integral to our future."

To navigate the challenges in the journey towards this digital future, Professor Kong had two pieces of advice: go slow and go small. "Go slow to minimise the potentially negative effects that come with speed," she said. "Smart solutions are not quick fixes to systemic problems; they are a catalysing glue that is only as effective as the policy regime and material environment within which it is deployed."

"Second, go small to minimise the potentially negative effects of transformation. Compared to major transformations, small incremental steps are often more in sync with the material conditions of the city in question."

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By Ng Yi-Di

Stimulus relief funds increase social distancing to stop spread of COVID-19

Findings suggest economically vulnerable households need to leave the house more to work

UNIVERSITY OF CALIFORNIA - SAN DIEGO

Research News

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IMAGE: STAGGERED INTRODUCTION OF SHELTER-IN-PLACE ORDINANCES. STATES AND CITIES IN THE SPRING OF 2020 TURNED FIRST TO SHELTER-IN-PLACE ORDINANCES TO TRY TO MITIGATE THE SPREAD OF THE CORONAVIRUS. THE AUTHORS OF... view more 

CREDIT: UC SAN DIEGO

As case rates of COVID-19 reach new heights across the nation, many states and cities are tightening stay-at-home restrictions to stop the spread. New research suggests that that those suffering from economic hardships are less likely comply with new stay-at-home orders; however, these same U.S. residents would be more likely to adhere to the new public health guidelines if their households received stimulus funds.

The results, published in the Journal of Economic Behavior & Organization, suggest that of the measures taken to address economic dislocation caused by the COVID-19 pandemic, the CARES Act helped reduce an important source of viral spread: social interaction.

In the new paper, researchers from the University of California San Diego School of Global Policy and Strategy and the University of Chicago Harris School of Public Policy sought to accurately measure public willingness to abide by shelter-in-place ordinances first introduced in spring of 2020.

The researchers examined large quantities of geolocated cellular phone device use patterns. The data, provided by the analytics company UNACAST, estimates information such as the number of people who are living in a home, the average time spent at home or outside, and changes in the average distance a user traveled. This information helped the researchers assess compliance with stay-at-home orders.

To determine how economic conditions shape compliance, the researchers compared the cell-phone data to county records containing average household incomes for every county across the U.S. from February through July 2020. They also took account of other factors that might influence county residents' willingness to comply, including how severely each county was hit by the virus, unemployment levels, population density, partisanship and where residents get their news.

Counties with above median income comply with shelter-in-place policies with reducing movement by an additional 60% compared to before the policies were introduced; however, compliance with shelter-in-place orders in counties where the average income is below the median is uneven at best.

"Not surprisingly, impoverished communities exposed to economic dislocation are the least likely to comply with shelter-in-place policies," said co-author Jesse Driscoll, associate professor of political science at UC San Diego's School of Global Policy and Strategy. "The data showed that working-class families -- especially those who had lost jobs or might soon lose them -- were overall much less likely to stay home, since they needed to leave the house to work. The more urgent public policy question going into this winter is whether these behaviors changed when stimulus checks arrived last time."

To assess how stimulus checks from the $2.2 trillion CARES Act, passed in March 2020, impacted compliance, the researchers used the same cellphone movement data to determine whether household income increases changed behavior as more of a county's residents began receiving stimulus payments.

While some beneficiaries received their checks weeks ahead of when others, the team were able to measure the impact stimulus dollars had on residents from data of recipients who used an electronic banking to deposit the funds, made available by the financial data company Facteus.

The researchers found that local stimulus injections significantly increased social distancing. For every additional dollar per capita a county received, movement temporarily declined by over 1 percent.

"As counties received more stimulus funds, their residents stayed home more," the authors write. "When they did head out, people in counties where most had received stimulus checks traveled less than people in counties where most checks had not yet arrived."

The authors conclude, "Targeted economic relief such as direct stimulus transfers and increased unemployment benefits may have limited potential spread of COVID-19 among economically disadvantaged populations."

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Co-authors of the "Poverty and economic dislocation reduce compliance with COVID-19 shelter-in-place protocol," paper include Konstantin Sonin, Austin L. Wright of University of Chicago Harris School of Public Policy and Jarnickae Wilson of JP Morgan.


Warbler coloration shaped by evolution via distinct paths

Color-related genes help explain how there are so many species of warblers

PENN STATE

Research News

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IMAGE: ACCORDING TO A NEW STUDY, THE EVOLUTION OF TWO COLOR RELATED GENES HELPS EXPLAIN THE STRIKING DIVERSITY IN COLORS AND PATTERNS AMONG WOOD WARBLERS, LIKE THE BLACKBURNIAN WARBLER PICTURED HERE. view more 

CREDIT: DARRELL COCHRAN

UNIVERSITY PARK, Pa. -- Two genes that are important for the diverse colors and patterns of warbler plumage have evolved through two very different processes, according to a new study led by Penn State researchers. These evolutionary processes could help explain the rapid evolution of these songbirds into so many unique species.

"Wood warblers are an incredibly colorful and diverse group of birds, with more than a hundred species in total," said Marcella Baiz, postdoctoral researcher at Penn State and first author of the paper. "These species arose very quickly in evolutionary time in what biologists call a species radiation. To better understand this radiation, we studied genetic regions related to plumage coloration within a particularly colorful subset of warblers."

The research team sequenced the genomes of all 34 species within the Setophaga genus of wood warblers and created a phylogenetic tree that clarifies how each species is related to one another. Then, they focused on nine closely related pairs of "sister species." Each pair is the result of one species diverging into two. Seeing if similar evolutionary processes are at play in each of the pairs allowed the researchers to gain a better understanding of the overall radiation.

A paper describing their results appears today (Nov 30.) in the journal Current Biology.

"In most cases it is difficult to get at the genes underlying the diversification process because it can be hard to link specific genes to specific traits, like colors," said David Toews, assistant professor of biology at Penn State and leader of the research team. "But many species of warblers readily interbreed, producing hybrid offspring with a mix of the parent species' traits, so we were previously able to link certain color patterns with their underlying genetic regions. In this study, we focused on two coloration genes, but were able to study them across all the species in this large genus, to give us a window into the rest of the radiation."

The first gene, the Agouti-signaling protein (ASIP), is involved in producing the pigment melanin, which underlies brown and black plumage in these warblers. Within each pair of sister species where there were differences in the amount or location of the black or brown in their plumage, the team predictably found genetic differences near ASIP.

"We created an evolutionary tree based solely on the ASIP gene region, which more clearly shows how the gene has changed across the genus," said Baiz. "The patterns in this gene tree mirror patterns in the phylogenetic tree based on what we see across the whole genome. This implies that the differences we see in ASIP resulted from mutations that arose independently in different species. However, the gene tree from the second gene, BCO2, showed a very different pattern that did not match up with the whole genome tree, which suggests different processes are at play."

The second gene, beta-carotene oxygenate 2 (BCO2), is involved in producing carotenoid pigments, which result in bright yellow, red, and orange plumage. The researchers suggest that a process called introgression-- the exchange of genes between species that have evolved separately--may explain why the pattern of genetic changes in BCO2 didn't align with the overall radiation of the group.

"Introgression can occur when two separate species hybridize, and the hybrid offspring go on to mate with one of the original species," said Baiz. "After several generations, genetic material from one species can be incorporated into the other. The signal of this kind of ancient introgression can be maintained in the genomes of living individuals--like how ancestry tests can reveal how many Neanderthal genes you have. In this instance, we unexpectedly found evidence for ancient introgression at BCO2 in two otherwise distantly related warblers in this genus."

The researchers found evidence of introgression involving the yellow warbler and magnolia warbler and involving the prairie warbler and vitelline warbler, all species with colorful carotenoid coloration in their feathers. However, they note that with the current data it is difficult to tell the directionality of the gene transfer.

"One possibility is that the magnolia warbler version of BCO2 introgressed into the yellow warbler, and this 'new to them' version produced a broader deposition of carotenoids in the feathers of the yellow warbler," said Toews. "It is fun to think that ancient introgression is what made the yellow warbler so yellow!"

This is one of the first examples of carotenoid gene transfer among vertebrates. Collectively, the results of this study suggest that both introgression and a more standard mode of evolution, where mutations occur and are passed from parent to offspring, have played a role in generating the diversity of colors in this genus and could have helped enable the extreme diversification of warblers.

In the future, the researchers hope to link specific mutations in these genes to changes in plumage coloration and to map out the molecular pathways involved in pigment production. They would also like to expand their study to all 110 species of warblers.

"There's a possibility that there may be introgression from another genus entirely," said Toews. "Expanding to other warblers would allow us to explore this possibility, and to more broadly understand the radiation of these fascinating birds."

CAPTION

The research team found that one color-related gene has undergone a standard mode of evolution, with mutations arising in separate species. By contrast, portions of the second gene in some cases have been transferred between species through a process known as introgression, where hybrid birds mate with a parent species and, over generations, transfer genetic material.

CREDIT

Todd Fellenbaum


In addition to Baiz and Toews, the research team includes Andrew Wood, a research technologist at Penn State, Alan Brelsford at the University of California Riverside, and Irby Lovette at the Cornell Lab of Ornithology. The Cornell Lab of Ornithology, the Penn State Eberly College of Science, and the Penn State Huck Institutes of the Life Sciences.

Scientists uncover the mysterious origin of canal grass in Panama

SMITHSONIAN TROPICAL RESEARCH INSTITUTE

Research News

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IMAGE: BECAUSE ITS TINY SEEDS BLOW IN THE WIND, CANAL GRASS READILY INVADES CLEARINGS AND SPREADS TO FORM IMPENETRABLE STANDS. ITS WHITE FLOWERS AND ITS HISTORICAL ASSOCIATION WITH THE PANAMA CANAL... view more 

CREDIT: KRISTIN SALTONSTALL

Urban legends about the origins of canal grass in Panama abound, but the Smithsonian has new evidence that puts the question to rest. Canal grass is an invasive weed, native to Asia. Because its tiny seeds blow in the wind, it readily invades clearings and spreads to form impenetrable stands by budding from tillers and rhizomes. Once established, canal grass is challenging to eliminate. Fire burns the tops and stimulates the roots. Glassy hairs edging its leaf blades cut skin and dull machetes.

The most widespread story is that the Panama Canal Co. imported canal grass (paja canalera or paja blanca in Spanish, Latin name: Saccharum spontaneum L.) for erosion control. In other versions, the U.S. Army brought it to landscape areas for military exercises or it arrived on ships transiting the canal during the 1950s or 1960s. Another study suggested that seeds or fragments of roots may have washed into the canal from a piece of earth-moving equipment from Thailand or Vietnam shipped through the canal in the 1970s.

"These explanations are all unlikely," said Kristin Saltonstall, STRI staff scientist. "The first documentation of its presence in Panama is a report by the Missouri Botanical Gardens from 1948."

A parent of sugarcane, S. spontaneum often arrives in out-of-the-way places as an escapee from breeding collections. Several previous reports from the Tropical Agriculture and Higher Education Research Center suggested that canal grass escaped from a U.S. Department of Agriculture sugarcane breeding program at the Canal Zone Experimental Gardens (now Summit Nature Park) in the early 1940s. Saltonstall's new genetic results support this idea.

In 1939, the U.S. Department of Agriculture sent more than 500 different varieties of sugarcane and close relatives to the Gardens. Breeders may have been concerned that they could be damaged by hurricanes at the sugarcane experimental station in Canal Point, Florida. The plants were allowed to flower in the gardens as part of ongoing sugarcane breeding trials between 1940 and 1945.

CAPTION

Kristin Saltonstall, STRI staff scientist, is fascinated by large, invasive grass species, which often radically change the ecosystems they invade.

Saltonstall compared DNA extracted from leaves of plants she collected in Panama to DNA samples from a large, international collection of sugarcane and sugarcane relatives maintained by colleagues in Australia, including many of the accessions that were likely brought to Panama in 1939.

"The conditions were right, the plants were there and the timing is right," Saltonstall said. "We can never say with 100% certainty that it came from the Gardens, but it certainly looks like it, because DNA from canal grass in Panama is very similar to accessions from Indonesia in the germplasm collection. All of these plants also have high ploidy levels [many copies of the chromosomes in each cell] and come from the same maternal lineage."

Sugarcane is the world's largest crop. In 2018, Panama produced 2.9 million tons of sugarcane. It was first domesticated in Southeast Asia in the eighth millennium B.C. and gradually spread around the world. Today, a hectare of sugarcane (a cross between S. spontaneum and S. officinarum) yields between 30 and 180 tons of sugar. Sugarcane breeders are eager to improve yield by producing hybrids with other species of grasses, but as they continue to experiment, the possibility of escapes like this continues.

"This was not an intentional introduction," Saltonstall said. "No one was thinking about invasive species at that time. More recently there have been escapes in the U.S. in Florida and Louisiana. Germplasm collections need to be monitored and if there is an escape, it needs to be dealt with before it becomes a problem."

Saltonstall will continue to study canal grass, fascinated by the way these large, invasive plants can take over an area and change its whole ecosystem. And as the world's climate changes, Panama may become drier and more subject to fires, which often start in urban patches of canal grass near burning garbage or roads and then burn into the forest and clear new areas for the canal grass to invade. Canal grass can tolerate drier conditions and outcompete other plants that are not resistant to drought, which may give it an advantage if the climate becomes drier.

CAPTION

Its white flowers and its historical association with the Panama Canal area inspired the common names paja blanca or paja canalera for this sugarcane relative, Saccharum spontaneum L..

CREDIT

Kristin Saltonstall

When businesses behave badly

SINGAPORE MANAGMENT UNIVERSITY

Research News

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IMAGE: WE'VE ALL HEARD OF CORPORATE SOCIAL RESPONSIBILITY, BUT WHAT HAPPENS WHEN COMPANIES DO THE OPPOSITE? THIS WAS THE QUESTION OF THE HOUR AT THE CONFERENCE ON GREEN AND ETHICAL FINANCE,... view more 

CREDIT: SINGAPORE MANAGEMENT UNIVERSITY

SMU Office of Research & Tech Transfer - On a fateful April night ten years ago, the Deepwater Horizon oil rig exploded - taking the lives of 11 crew members and triggering the largest marine oil spill in history. Nearly five million barrels of oil spilled into the Gulf of Mexico, polluting around 2,100 kilometres of shoreline and killing thousands of marine mammals.

A federal probe later pinned the explosion on cost-cutting measures by British oil supermajor BP, owner of the doomed rig. Not only did BP pay US$20 billion in fines to resolve claims from the catastrophic spill, but the company was also blocked for two years from seeking new contracts with the US government owing to their perceived "lack of business integrity".

However, BP is not the only corporation to have landed in hot water for its lapses in judgment. In 2018, US tech giant Google was hit with a US$1.7 billion fine for stifling competition in online advertising. Such negative incidents resulting from the unscrupulous behaviour of corporations can be considered as instances of corporate social irresponsibility (CSI).

Yet, little research has been done on the impacts of CSI on the corporations themselves. To address this gap in literature, Drs Chloe Ho, Thu Ha Nguyen and Van Vu examined how negative environmental and social-related (E&S) incidents affected corporate policies in a study published in SSRN.

As part of the Conference on Green and Ethical Finance held from 16 to 18 September 2020, their findings were tackled in the environmental, social and governance (ESG) session chaired by Professor Dave Fernandez, Director of Singapore Management University's (SMU) Sim Kee Boon Institute for Financial Economics (SKBI). The virtual conference was jointly organised by SKBI, Asian Development Bank Institute and the Journal of Banking and Finance.

A financial trail of misbehaviour

According to Dr Vu, a Lecturer at La Trobe University who presented the paper on behalf of her co-authors, existing studies tend to focus on corporate social responsibility (CSR), but there is still no consensus on how such activities influence corporate policymaking. This is partly because CSR activities are typically disclosed by firms themselves, making their reports prone to greenwashing biases that distort the company's true impact, said Dr Vu.

This limitation can be overcome by examining negative E&S incidents. As these incidents are 'exogenous shocks' - that is, they are covered by external news reports - focusing on them avoids the problem of firms self-reporting. "Instead of looking at CSR performance, we looked at negative events and asked: what would happen to the firm's activities following these events?" explained Dr Vu.

To answer their primary research question, the authors collected data on E&S incidents dating from 2010 to 2018 and obtained the financial information of the firms involved. They found that following such incidents, the cash holdings, net equity issuances and capital expenditure of firms decrease, while their net debt issuances and leverage increase to buffer the negative shock of the incident.

According to Dr Vu, these findings suggest that firms tend to follow the pecking order theory. This means that after such incidents, firms first draw down on their internal funds to pay penalties and other reputational costs, after which they rely on debt financing rather than equity financing to manage the scandal. Further investigation by the authors also revealed that firms rely more heavily on long-term debt after E&S incidents, due to the liquidity risk posed by short-term debt.

However, companies appear to react differently to the incidents depending on their financial constraints. "Financially constrained firms are unable to raise additional equity in the equity market, which is why they have to cut back on their capital expenditure," Dr Vu said. "This is in contrast to non-financially constrained firms, who tend to be able to rely on the debt market to raise additional funds. This could explain why they don't have to cut back on their investment."

Proving that a little goodwill goes a long way, the authors also observed that firms with a high CSR reputation were more capable of cushioning the impacts of E&S incidents. This was reflected in the fact that firms with high reputational capital do not change their investment and financing decisions compared to low-reputation firms. "CSR is important in a sense that when the firm experiences a negative incident, there are less adverse effects on their business," Dr Vu said.

Zooming out from firm to industry

While the study of Dr Vu and her colleagues certainly addressed a gap in literature, SMU Associate Professor Liang Hao, who was the discussant of the Dr Vu's paper, suggested that their arguments could have been strengthened by the presence of an overarching theory. "We know that CSR affects corporate policies. What's the one story that can expand the results across five dimensions - cash holdings, net equity issuance, capital expenditure, net debt issuance and leverage?" asked Professor Liang.

For instance, CSR could be framed as a risk-management tool. "You do CSR in advance such that after negative shocks, firms and stakeholders will still view you positively and are less likely to punish you," he explained. Alternatively, CSR could also be used as a strategic signalling tool. "Some firms use CSR as a public-relations strategy to signal that they are actually good firms, even though they experience negative shocks." Regardless of which narrative the authors would have chosen, linking the findings to a particular mechanism would have benefitted the paper, Professor Liang said.

Though the authors report on exogenous shocks, Professor Liang argued that E&S incidents are a wider reflection of the firm's corporate governance quality. "There's a high correlation between E&S and governance. This means that well-governed firms have certain patterns of corporate policies," he explained. "What you're probably capturing is a governance effect rather than an E&S effect. Therefore, the results could be driven by poor governance."

Some firm-level E&S incidents may also be emblematic of wider industry-level issues, Professor Liang suggested. Hence, future research could examine the policies of peer firms that did not experience negative shocks following the E&S incidents of other firms. Incidents at the firm level and at the industry level could also be separately analysed, as the latter are considered more exogenous compared to firm-level incidents, Professor Liang noted.

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By Kami Navarro

Flashy lizards are more attractive to mates and to predators

BINGHAMTON UNIVERSITY

Research News

IMAGE

IMAGE: A WATER ANOLE WITH A COLORFUL DEWLAP. view more 

CREDIT: J. MONTEMARANO.

BINGHAMTON, NY -- In the lizard world, flashy colors attract the interest of females looking for mates. But they can make colorful males desirable to other eyes, too -- as lunch.

Assistant Research Professor of Biological Sciences Lindsey Swierk is the first author of an article in the journal Evolutionary Ecology on the topic. Called "Intrasexual variability of a conspicuous social signal influences attach rate of lizard models in an experimental test," the article details an experiment involving clay models of water anoles (Anolis aquaticus), a species of lizard only found in Costa Rica and a small slice of Panama. The researchers conducted the experiment at the Las Cruces Biological Station in Costa Rica, which is one of the Organization for Tropical Studies' field stations.

To attract females' notice, male anoles have dewlaps: colorful extendable flaps of skin under their chins. In most species of anole, dewlaps evolved to be as noticeable as possible within the environment, given an environment's predominant colors and lighting conditions.

"Even so, we see a lot of variation within a species in just how bright dewlaps are," Swierk said.

While some water anoles have dramatic red-orange flaps, others have more muted colors, more of a dull brownish-red. Researchers wanted to determine the effect these color variations had on their risk of predation.

While it's widely assumed that flashier males will attract more attention from predators, few studies actually test this assumption. Logistics may be a factor: Researchers have to separate the effects of sexual colors from other aspects of a creature's body and behavior, a difficult task when using real animals. As a result, many studies show correlation but not causation.

To prove that flashier males face greater risks of being attacked, the researchers created clay models with colored dewlaps -- some bright, some more muted. Many visual predators use a stereotyped "search image" to identify prey, so the models only had to approximate anoles' general size, color and shape. The dewlap color, however, required special attention.

"Because different animals have different visual sensitivities than we do as humans, getting the colors right was an important consideration in our model design," Swierk explained. "We ran some pilot trials before this experiment to make sure our models were convincing as 'lizards' -- and they certainly seemed to be, as many birds and other lizards took bites out of them!"

Researchers were able to identity predators from bite marks in the clay models. They included many species of bird, including the strikingly beautiful motmot with its serrated beak. Basilisks and whiptail lizards were also among the likely attackers. The results proved that flashier lizards really do end up as lunch more often.

If bright colors have deadly consequences, why do female anoles prefer them? One answer is that brighter males have either high-quality genetic material or resources that allow them to handle the risk of getting eaten, Swierk explained.

"Because every individual's evolutionary 'mission' in life is to pass on as many copies of its genes as it can, conspicuous traits like these can evolve if they give an individual a high level of reproductive success -- even if the flashy trait ends up killing them in the end," Swierk said.