Friday, July 09, 2021

 

Why insisting you're not racist may backfire

Experimental study finds white people often send the opposite message when they explain why they're not prejudiced

UNIVERSITY OF CALIFORNIA - BERKELEY HAAS SCHOOL OF BUSINESS

Research News

When you insist you're not racist, you may unwittingly be sending the opposite message.

That's the conclusion of a new study* by three Berkeley Haas researchers who conducted experiments with white participants claiming to hold egalitarian views. After asking them to write statements explaining why they weren't prejudiced against Black people, they found that other white people could nevertheless gauge the writers' underlying prejudice.

"Americans almost universally espouse egalitarianism and wish to see themselves as non-biased, yet racial prejudice persists," says Berkeley Haas Asst. Prof. Drew Jacoby Senghor, one of the authors. "Our results suggest that the explicit goal of appearing egalitarian might blind people to the possibility that they could be communicating, and perpetuating, prejudicial attitudes."

Co-authored by Derek Brown, PhD 24, and Michael Rosenblum, PhD 20--a post-doctoral scholar at NYU Stern School of Business--the study builds on past research finding people's racial prejudice "leaks out" through nonverbal behavior, such as facial expressions or physical distance. In a series of experiments published in the Journal of Experimental Social Psychology, the researchers looked at perceptions based solely on written content.

They selected a group of white participants, screening out the small percentage who expressed overt prejudice, and scored subjects' racial attitudes with two widely used assessments. The subjects were then asked: "Do you believe that all people are equal and should have equality of opportunity? Why or why not?," and "Are you prejudiced toward Black people? Why or why not?" A second group of white participants, asked to read the written responses, accurately estimated how the writers had scored on the prejudice scale.

Linguistic cues

In a second experiment to parse out whether people were signaling racial attitudes intentionally or inadvertently, they asked one group to answer as honestly as possible and another group to answer "in the least prejudiced way possible." There was no difference to the readers, who accurately scored both groups' answers.

"That gave us some confidence that people are naturally trying to come across as egalitarian, but something about the language they choose is betraying them," Rosenblum said.

What were those linguistic cues? The most powerful indicator, they found, was language that dehumanized or objectified African Americans--for example, "I have a great relationship with the Blacks." Other characteristics such as defensiveness, references to personal responsibility, or a belief that equal opportunity exists were strongly associated with higher levels of prejudice, and cues such as focus on equity or an acknowledgement that inequality exists were associated with lower levels of prejudice. Interestingly, references to being colorblind or mentions of personal contact with Black people weren't indicative of the white participants' attitudes.

"This demonstrates that peoples' use of the cues are meaningful not only for how prejudice is expressed, but also how egalitarianism is perceived," said Brown.

Contagion effect

A third experiment had a sobering result. The researchers found that white participants reported greater prejudice towards Black people after reading statements from the self-avowed white egalitarians who scored high on underlying prejudice. In other words, the readers mirrored the attitudes of the writers, even when they identified themselves as ideologically dissimilar (conservative vs liberal).

"We don't know reading other people's views gave them permission to express more prejudice, or whether they thought that this is the norm and their actual prejudice level changed, but there seemed to be a contagion effect," Rosenblum said. "One of the lessons here is that words carry weight. It does seem that this is one way that prejudice is unwittingly spread."

###

*This study was first made available online in February 2021 ahead of publication in the May 2021 issue of the Journal of Experimental Social Psychology.

 

For neuroscientists and researchers in general, a checklist for eliminating gender bias

Changing mindsets is key, so that everyone, including men, are vocal advocates for women

UNIVERSITY OF CALIFORNIA - BERKELEY

Research News

In 2019, Anaïs Llorens and Athina Tzovara -- one a current, the other a former University of California, Berkeley, postdoctoral scholar at the Helen Wills Neuroscience Institute (HWNI) -- were attending a scientific meeting and pleased that one session, on gender bias in academia, attracted nearly a full house. The problem: The audience of some 300 was almost all women.

Where were the men, they wondered? More than 75% of all tenured faculty in Ph.D. programs around the world are men, making their participation key to solving the problem of gender bias, which negatively impacts the careers, work-life balance and mental health of all women in science, and even more so for minority women and members of the LGBTQ+ community.

"If they are not on board, and they don't feel that this is also their fight, then nothing will change," Llorens said.

That was only one of the incidents that led the two women to round up 45 men and women from 40 institutions across 10 countries and 18 nationalities, divide them into small groups and task them with scouring the literature for practical tips -- proven and unproven -- on how best to counteract all aspects of gender bias in academia. The study, with Llorens and Tzovara as first authors, appears today in the journal Neuron, and provides a comprehensive summary of the many forms that gender bias takes, along with a checklist that individuals, lab leaders, university administrators, journal editors and grant reviewers at funding agencies can use to remedy them.

Both women thank their mentor, Bob Knight, a UC Berkeley professor of psychology and neuroscience in the HWNI, for his enthusiastic support of women researchers and of their project, which they admit was substantially different from their main fields of research: how the brain deals with language and conscious perception of the environment. But as the two women transition to the next stages of their careers -- Tzovara, originally from Greece, left two years ago to become an assistant professor at the University of Bern in Switzerland, while Llorens, who is French, is finishing up her postdoctoral research at UC Berkeley -- they wanted to leave a legacy for women who follow them in neuroscience.

In a Q&A, Llorens and Tzovara talk about their motivations and the problem of gender bias in the ivied halls.

What drove you to undertake this year-long project?

Llorens: The starting point was at the end of 2019, when we went to a neuroscience conference, a big one, and we talked with many of our women colleagues and realized how many of us were struggling to find a correct balance between having a family, a life, and also finding a permanent position. In science, you often have to move abroad, for most of us in Europe, especially, and it is a long process before you can settle down and find a permanent position.

Then, at this very same conference, we attended a workshop on how to strive as a woman in neuroscience, and we really felt the discrepancy between what we were actually living as scientists and what the panelists were telling us. There were five successful women who managed to have a perfectly balanced life, with 300 women listening. When we came out of the room, we felt like we were the issue, because, obviously, they made it. Maybe we are the problem?

Tzovara: There is this notion of survivorship bias -- often we look at people who have made it, and we forget all the people who did not have a straightforward career path and are not there yet. That helped us to identify this gap between what others described, and what we experienced ourselves, and realize that the more we talk about bias, the more interest we find from men and women. That is why we wanted to give voice to all these discussions that we had among ourselves and write them down, hoping that these will be the beginning of a bigger conversation.

Llorens: After that workshop, I felt that had I wasted my time, because nothing will change by simply listening to successful women, if I may say so; we need more than that to actually see some improvements. That is why, for us, it was important to have as many men on board in this project who felt concerned and also wanted to fight for equity. It is something we need to discuss together.

Hasn't the situation improved for women in STEM fields over the past generation?

Llorens: Absolutely. We can really see improvement in many aspects of science. In many countries, between 20% and 25% of women are professors. We can also see progress in preventing sexual harassment. It is better, but we are far from equity. It is still not safe enough and still not equal enough.

Tzovara: I've observed improvements even in the last five or 10 years. These days, if there are conferences that have men-only panels, they will be called out. If there are journals where the editorial board is composed exclusively of men, they will be called out. So, there is concrete change compared to some years ago. I think it might be like a cascade effect -- the more we talk about bias, the more people are aware of it, the more we can realize that we need to take action. All this together has the power to bring positive change.

Llorens: But now some people think, "Ok, there is some improvement, so maybe we don't need to work as hard to make things better." And that is a problem, because equity won't just come magically; we need to keep working on it. And that is also an issue when we talk to people and they say, "It's better, it is just a matter of time." No, it isn't, actually. It is a matter of people making that change. We still need actions to make things right. There is progress, for sure. We are moving in the right direction. But we need to keep making the effort.

You provide many suggestions, but one is having a gender target in grants to improve equity, which some people -- women, as well as men -- might object to in the same way that people have objected to affirmative action for people of color.

Llorens: We advocate for a more equitable distribution of funding. Funding agencies should make an extra effort to insure a fairer distribution of the resources between genders. That said, during my career, I was hired through a grant promoting diversity by potentially hiring a woman, and I must admit when I read that I wondered, "Did I get the job because I was the best applicant or because I was a woman?" That is the tricky thing with positive actions: We still need them, as academia is still imbalanced for now, but we must somewhat force it. But I also had to work on my own self-esteem to understand that this is the way that things have to be done. It is not because I am not good, but it is just because we have to make things right.

Tzovara: Sometimes it is just about giving the right opportunities to people who are not traditionally represented in academia and then giving them some space. And that can often be enough by itself to let individuals that are traditionally underrepresented shine.

Do men suffer from the same pressures when trying to succeed in academia?

Tzovara: That reminds me of a discussion we had with one of our men co-authors who was trying to understand the way that women experience science. He, too, felt that he had experienced similar issues: difficulties moving abroad or difficulties with his family. But as women, we experience it much, much worse. Sometimes bias and discrimination or micro- and macro aggressions pile on top of the usual challenges associated with working in science.

Llorens: Biology is different. Men don't feel the same pressure as we do because, for us, literally, everything happens at the same time. In this window between 28 and 36 years of age, we need to find a position, but this is also when we have to be the most mobile, and it is the right age to build a family. For men, they can wait. It is challenging for everyone to keep relationships, but it is not the same pressure.

If you had to prioritize the most important interventions for reducing gender bias, where would you start?

Llorens: There are existing tools that people can use to mitigate bias pretty easily. For instance, regarding equitable citations in journal articles or in syllabi for teaching. These are easy actions that can be taken right now to make things better, and they are already known to be valuable.

For me, the biggest challenge, and I think the most impactful, would be to change mindsets. Everyone needs to be on board with this topic to make real change. If men are on board, then we will have allies at the top, because most of the leaders are men. We also need more action around sexual harassment. Stopping sexual harassment is everyone's job, of course, but the leaders need to be strict and clear with sexual harassment policies; they have to lead by example. Change has to come from the top. It is really important to make the working environment safe.

Tzovara: There are so many different things that we can do, and I think everybody should do both the smaller and the larger things. If they see injustice or bias, they should speak up. If someone is representing an institute, like a university or funding agency, they should make sure that the work of the institute represents equity. They should make sure that funding is equally distributed, that the institute doesn't only hire men, that promotions take gender bias into account, and so on. If someone has the power to change society and change mindsets, they should start working on that. And that is the message we tried to convey with this manuscript, where we split the suggested solutions into three levels of individual, institutional and societal to show that everybody has a responsibility, depending on their position and abilities.

Llorens: And also removing the burden that we have as women. On top of having to represent ourselves as women, we have to be part of committees and to add some extra work to represent women in science. If we can have everyone on board, meaning everyone advocates for underrepresented groups, even though they are not part of a one of those groups themselves, then the burden will be shared, and it will become easier for everyone. For me, that will be the most impactful action, for everyone to be more aware of these issues and take a stand and help us with that.

I also think that transparency is key. For instance, institutions must be transparent regarding negotiations, such as about the scale you can ask for salaries. The institution has to make things easier for everyone to navigate academia, to be honest. And because most of the biases are implicit, we need to call them out and make them explicit because many people think that they are not biased. I feel like I, too, am part of the problem. I have my own biases, everyone has their own bias. But I think acknowledging them, making them explicit, is also a step forward that people need to take.

How would you characterize UC Berkeley's response to gender bias?

Llorens: I think the way that they advertise now for positions -- making it mandatory to have women applicants -- is a good step forward. It means that the department has to actually do research when they are hiring for a position. When we talk now with students about gender bias, some of them are worried that if we do that, it means that we might need to go for someone who is not the best candidate. When I mentioned this to Bob Knight, who has been part of recruiting committees for many, many years, he said that the fact that you actually have to look for a broader pool of people you might not have thought of before was actually a good thing, that they never, ever chose someone that wasn't the top choice. For him, it didn't change the way he was recruiting people, it only diversified and increased the pool of subjects. The best candidate was offered the job. It just might not have been the best person they thought about before.

Also, in the past few years UC Berkeley has done a good job of increasing awareness of sexual assault and sexual harassment. The kinds of services and help offered by the university, including the Path to Care Center, for example, I found really interesting. Not all institutions have that. I also would add that UC Berkeley has really tried to raise awareness about women in science this year with the emphasis on 150 Years of Women at Berkeley. It is always important to try to raise awareness of this topic.

But UC Berkeley is a bubble.

Tzovara: And the lab we were in is a bubble within a bubble. I think I speak for a lot of people in the lab that we felt secure that, if something happened, Bob would have our backs. It is very important for members of any institution or individual lab to know that their mentors have their backs and speak up when they see injustice.

Llorens: You know the imposter syndrome -- it impacts women and men, but mostly women. When you have a PI who makes sure you are in a safe environment and makes you feel like you can do it, it helps a lot. It is not like that in many places, to be honest with you. Bob and Nina Dronkers (an adjunct professor of psychology who also is a co-senior author of the paper) were wonderful mentors.

How did you put together these checklists?

Tzovara: We wanted to base the paper on data. We read a lot -- we have almost 300 references in the paper -- and tried to back up everything with science and describe what worked and what didn't in remedying gender bias. We wanted to give examples of which of the proposed solutions can work and have been actually tested, and which are implemented in some parts of the world, but may still have uncertain results. The goal is to start from there and see what can be done to improve things on the individual, institutional and societal level.

What are your hopes for this paper?

Llorens: We want this paper to be disseminated widely and across different borders in academia. We are also now giving workshops at various scientific meetings and talking to undergraduate students.

Tzovara: Other activities that we plan to pursue include organizing mentoring seminars for women in science. One of the next steps is to also reach out to even younger ages. We would like to start talking about bias to young students in schools when their mindsets are still being shaped, in order to have an impact on the next generation.

Llorens: Gender bias is a sensitive topic, but we just want to get the discussion rolling. Hopefully, we can do a follow-up study in five years and say which suggestions worked to mitigate gender bias, and keep making progress on that topic so that we will end up with a checklist that each lab can refer to.

###

 

'Fortunate accident' may yield immunity weapon against antibiotic-resistant bacteria

Johns Hopkins Medicine study uncovers enzyme inhibitor that boosts immune system to fight MRSA and other dangerous skin infections

JOHNS HOPKINS MEDICINE

Research News

IMAGE

IMAGE: SCANNING ELECTRON MICROGRAPH OF METHICILLIN-RESISTANT STAPHYLOCOCCUS AUREUS (MRSA) BACTERIA BEING ENGULFED BY AN IMMUNE CELL KNOWN AS A NEUTROPHIL. JOHNS HOPKINS MEDICINE RESEARCHERS HAVE DISCOVERED THAT BLOCKING A SPECIFIC GROUP... view more 

CREDIT: NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES, NATIONAL INSTITUTES OF HEALTH

FOR IMMEDIATE RELEASE

In what turned out to be one of the most important accidents of all time, Scottish bacteriologist Alexander Fleming returned to his laboratory after a vacation in 1928 to find a clear zone surrounding a piece of mold that had infiltrated a petri dish full of Staphylococcus aureus (S. aureus), a common skin bacterium he was growing.

That region of no bacterial growth was the unplanned birth of a medical miracle, penicillin, and would lead to the era of antibiotics. Now, in a paper published today in the journal Science Translational Medicine, researchers at Johns Hopkins Medicine have announced another accidentally discovered, potentially game-changing treatment -- one that may one day provide an alternative immune-based solution to the danger of antibiotic-resistant bacterial infections.

And like Fleming's surprise finding, the bacterium of note is once again S. aureus -- but this time, methicillin-resistant Staphylococcus aureus, the life-threatening strain unharmed by methicillin and other antibiotics, and better known by its acronym, MRSA.

The paper's senior author, Lloyd Miller, M.D., Ph.D., former professor of dermatology, infectious diseases and orthopaedic surgery at the Johns Hopkins University School of Medicine, and now with Janssen Research and Development, says the research team was originally intending to study the mechanisms behind MRSA skin infections in mice with and without the ability to manufacture interleukin-1 beta (IL-1β). This protein, transformed into its active form by enzymes called caspases, enhances protective immunity by helping immune cells called neutrophils, monocytes and macrophages fight bacterial infections.

"We gave the mice a blocker of all caspases [pancaspase inhibitor], a compound known as Q-VD-OPH, thinking it would leave both sets of mice more vulnerable to MRSA infection," Miller says. "To our surprise, blocking caspases had the opposite effect, resulting in a rapid and remarkable clearing of the MRSA bacteria by keeping the immune cells alive and boosting their protective function."

Sensing they might have accidentally uncovered a means of fighting bacterial "superbugs," Miller and his colleagues conducted their latest study to confirm the unexpected finding was not a fluke.

The results were encouraging.

"A single oral dose of Q-VD-OPH decreased the size of MRSA skin lesions and rapidly cleared the bacteria compared with vehicle-treated [given the carrier solution without Q-VD-OPH] and untreated mice," says study lead author Martin Alphonse, Ph.D., a dermatology postdoctoral fellow at the Johns Hopkins University School of Medicine. "And surprisingly, the treatment worked whether IL-1β was present or not -- and without administering any antibiotics."

The researchers, says Alphonse, found that the pancaspase inhibitor reduces apoptosis -- one of three main methods the body uses to remove worn-out or damaged cells -- of neutrophils and monocytes, leaving them in plentiful numbers and better able to remove MRSA bacteria.

"It's like a fire department where older firetrucks are kept operating to help put out blazes, when otherwise, they would have been taken out of service," says Miller.

The researchers also saw enhanced necroptosis -- a second controlled cell death process similar to apoptosis -- of macrophages, which are mature monocytes.

"The destruction of macrophages by necroptosis releases large amount of tumor necrosis factor, or TNF, a protein that triggers bacteria-fighting immune cells to swarm into an infected area of skin," says Alphonse.

Finally, the researchers tested whether Q-VD-OPH in mice could have broader activity against two other dangerous skin bacteria, Streptococcus pyogenes (the cause of multiple diseases, including scarlet fever, necrotizing fasciitis and toxic shock syndrome) and Pseudomonas aeruginosa (often a threat to hospitalized patients on ventilators, with catheters or suffering wounds from surgery or burns). The targeting of the body's immune system against bacteria via pancaspase inhibition -- referred to as "host-directed immunotherapy" -- proved just as successful as it had been for MRSA.

"It was an accidental finding by Alexander Fleming that led to the golden age of antibiotics, but now that's nearing the end because of antibiotic-resistant bacteria," says Miller. "It seems fitting that another surprise in the lab could be the start of a second golden age, the use of host-directed immunotherapy," says Miller.

###

Along with Miller and Alphonse, the Johns Hopkins Medicine research team includes Jessica Rubens, Roger Ortines, Nicholas Orlando, Aman Patel, Dustin Dikeman, Yu Wang, Ivan Vuong, Daniel Joyce, Jeffrey Zhang, Mohammed Mumtaz, Halyun Liu, Qi Liu, Christine Youn, Garrett Patrick, Advaitaa Ravipati, Robert Miller and Nathan Archer.

Data from this study were included earlier this year in a U.S. patent application (PCT/US2021/024889) through Johns Hopkins Technology Ventures for "caspase inhibition as a host-directed immunotherapy against bacterial infections."

The work was supported by grant T32AI052071 from the National Institute of Allergy and Infectious Diseases, and grants R01AR073665 and R01AR069502 from the National Institute of Arthritis, Musculoskeletal and Skin Diseases.

Miller is a full-time employee of Janssen Research and Development; has received grant support from AstraZeneca, Pfizer, Boehringer Ingelheim, Regeneron Pharmaceuticals, and Moderna Therapeutics; holds stock from Johnson & Johnson and Noveome Biotherapeutics; and was a paid consultant for AstraZeneca, Armirall and Janssen Research and Development, which are all developing therapeutics against S. aureus and other pathogens.

None of the other authors have financial disclosures or conflicts of interest related to this study.

 

Experts recommend a varied and moderate consumption of sushi limiting quantities of tuna

A research group from the Universitat Rovira i Virgili and the Pere Virgili Health Research Institute have analysed the concentration of various toxic elements in these foods and evaluated the risk of consuming them in infant, adolescent and adult population

UNIVERSITAT ROVIRA I VIRGILI

Research News

Eight pieces of salmon-based maki, nigiri or sashimi or maki unagi (eel) is the safest combination of sushi for adult and adolescent populations. That is one of the findings of TecnATox (Centre for Environmental, Food and Toxicological Technology), a joint research group from the URV and the Pere Virgili Health Research Institute (IISPV), which has analysed the presence of arsenic and various heavy metals in sushi. The consumption of sushi has increased significantly since the start of the 21st century, as has the number of restaurants offering it throughout the region. Although eating fish is recommended because of its high nutritional value, it can also lead to exposure to contaminants, such as heavy metals. Likewise, rice is a food that provides many nutrients and fibre and is low in fat, but it too can be source of pollutants such as arsenic.

The research group analysed the concentrations of various toxic elements (cadmium, nickel, lead, mercury, inorganic arsenic and methylmercury) and iodine in a hundred pieces of sushi, specifically those known as sashimi (raw fish), maki (a seaweed roll stuffed with rice, raw fish or other ingredients) an nigiri (balls of rice with fish or seafood on top). The researchers also calculated dietary exposure to all of these contaminants in various population groups (infants, adolescents and adults) and evaluated the risks to health.

The main results show a significantly higher concentration of inorganic arsenic in maki and nigiri, compared to sashimi, a finding associated with the presence of rice. They also show higher levels of mercury and methylmercury in sushi that contains tuna due to the bioaccumulation and biomagnification of this metal.

The research group also wanted to determine how consumption of this foodstuff varied in different groups of the population. They examined an average intake of 8 pieces of sushi in adults and adolescents and an average intake of 3 pieces in infants and found an increase in exposure to nickel and lead, although this remained within safe established levels. "The most worrying finding concerns methylmercury, a highly neurotoxic compound, for which there was an estimated exposure of 0.242 μg per kg of bodyweight in adolescents, a value higher than the safe daily limit established by the European Food Safety Authority (EFSA)", explained Montse Marquès, one of the researchers who worked on the study. By the same token, although not as high as in adolescents, the exposure levels calculated for adults and infants also suggest a relatively high intake of methylmercury.

Finally, the results were analysed as a whole to determine which combinations of sushi do not represent a risk. "We recommend that people combine 8 pieces of salmon-based maki, nigiri or sashimi or maki containing unagi (eel) and limit their consumption of any type of sushi containing tuna", warned Marquès.

The researchers stressed that the amounts of sushi analysed constitute only one of the five recommended meals a day. This means that the consumption of other foods throughout the day may also lead to exposure to certain toxic elements, such as arsenic (present in rice and rice-based foods), mercury (present in tuna and swordfish) or nickel (present in vegetables, pulses and cereals).

Due to its nutritional benefits, the researchers still recommend the consumption of sushi, but they also stress the need to do so in moderation in order to minimise the intake of certain food toxins.

###

 

How fishing communities are responding to climate change

Wellesley professor examines how fishers are adapting to climate-related changes in species distribution and location

WELLESLEY COLLEGE

Research News

IMAGE

IMAGE: LARGER FISHING TRAWLERS ARE SEEN IN POINT JUDITH, RHODE ISLAND. COMMUNITIES OF VESSELS HAVE VARYING RESPONSES TO SHIFT IN SPECIES' DISTRIBUTION, BASED IN PART ON THE RELATIVE SIZE OF VESSELS. view more 

CREDIT: COURTESY OF EVA PAPAIOANNOU

What happens when climate change affects the abundance and distribution of fish? Fishers and fishing communities in the Northeast United States have adapted to those changes in three specific ways, according to new research published in Frontiers in Marine Science.

Becca Selden, Wellesley College assistant professor of biological sciences, and a team of colleagues examined how fishing communities have responded to documented shifts in the location of fluke and of red and silver hake. The team found that fishers made three distinct changes to their approaches: following the fish to a new location; fishing for a different kind of fish; and bringing their catch to shore at another port of landing.

Selden began this research as a postdoctoral scholar at Rutgers University in New Jersey with Eva Papaioannou, now a scientist at GEOMAR. They combined quantitative data on fish availability from surveys conducted by the National Marine Fisheries Service at the Northeast Fisheries Science Center and a unique geographic information system database from fishing trip records developed for this project. The researchers then interviewed fishers in 10 ports from North Carolina to Maine.

They explored three dominant strategies, and found that fishers throughout the Northeast were more likely to shift their target species. In interviews, the researchers learned that targeting a mix of species is a critical option for adaptation. Doing so can be complicated, however, because in many cases regulations and markets (or the lack of a market) constrain fishers' ability to take advantage of a changing mix of species in fishing grounds. For example, in Point Pleasant, N.J., fishers can't capitalize on an increase in dogfish in the region because of strict conservation measures that have been in place since 1988, when the species was declared over-fished, and the resulting absence of a market for those fish.

"Most communities tend to fish where they have fished for generations, and therefore, for any fishery management plan to be more climate-ready in the future, it needs to take that into account," Selden said. "They're less likely to move where they fish, more likely to switch what they fish, but only if they can, and regulations play a big role in that being successful."

The researchers also learned about a previously undescribed strategy in which fishers change where they bring the fish ashore to sell. This is particularly common for vessels coming from northern fishing communities that sell fluke in Beaufort, N.C. "Had we not combined the quantitative data with the in-depth interviews with community members, we would have totally missed the phenomenon we saw come to light in Beaufort," Papaioannou said. "It made for such a powerful way of analyzing the data, so that we were really using it to influence the questions we would ask in each interview, and the interviews would drive what we would examine in the quantitative data. I think that approach really made for a much more complete look at the impact of changes in species distribution and fishers' adaptations."

Of the fishing communities they studied, only the one in Beaufort used the tactic of following fish to new grounds. Unlike communities in the north, fishers in Beaufort have targeted fluke heavily in the past, and because the port is on the southern edge of the range for this species they are more vulnerable as the species shifts north. "Beaufort fishers have gone to tremendous lengths to keep fishing fluke," Selden said, "and following fish to new grounds brings its own constraints and concerns." These include the cost of increased fuel use, safety issues due to vessel size, and the local environmental knowledge needed to fish successfully in new locations.

All of these responses are intertwined, Selden said, so as we learn more about the effects of climate change on the future of fishing, understanding, predicting, and planning for any one of them will require examining all three together.

The researchers focused on the Northeast because it has been a hotspot of recent ocean warming, especially in the Gulf of Maine, and in some ways it is a harbinger of what other areas might be experiencing soon, Selden said. Along the East Coast, she said, "you have species that have these state-by-state regulations, you're passing through different jurisdictions and three different fisheries management councils, and species are crossing boundaries all over the place. This all has an impact on fishers, their behavior, and their communities."

Selden plans to continue this work on the West Coast--where there are only three states and one fishery management council--to compare how stable their fishing grounds are and how much fishers are switching species versus shifting where they fish.

"Fisheries are really on the frontline of climate impacts," Selden said. "It's really a bipartisan issue, and there are stakeholders across party lines. That was my motivation to focus on how communities are adapting, how they've adapted to past change. We need to be able to understand how they might adapt to future change and potentially how we would need to change management to facilitate some of the adaptations that they are already demonstrating."

The team is building a website that fishers and communities can use to see some of these patterns and learn more about what their counterparts elsewhere are doing about them. Community leaders and fishery management officials could also use the information to promote a broader understanding of the issues and potentially prioritize fishery development projects or plan for where a species will go next.

###

Disclaimer: AAAS and EurekAlert! are not responsible for t

 

To predict underwater volcano eruptions, scientist looks at images from space

A new study monitored satellite images to obtain sea discoloration data as a novel indicator in detecting if an underwater volcano's eruption is imminent.

HIROSHIMA UNIVERSITY

Research News

IMAGE

IMAGE: THIS PHOTO SHOWS A SAMPLE OF THE (FE + AL)/SI DISTRIBUTION AS A VOLCANIC ACTIVITY INDEX FROM MAY 16 TO JUNE 25 AROUND NISHINOSHIMA ISLAND: (A) MAY 16-23, 2020, (B)... view more 

CREDIT: JAXA/YUJI SAKUNO

A new study suggests sea discoloration data obtained from satellite images as a novel criterion in predicting if eruption looms for an underwater volcano.

There have been frequent eruptions of submarine volcanoes in recent years. The past two years alone recorded the explosions of Anak Krakatau in Indonesia, White Island in New Zealand, and Nishinoshima Island in Japan. Observing signs of volcanic unrest is crucial in providing life-saving information and ensuring that air and maritime travel are safe in the area.

Although predicting when a volcano will erupt can be difficult as each behaves differently, scientists are on the lookout for these telltale signs: heightened seismic activity, expansion of magma pools, increases in volcanic gas release, and temperature rises.

For submarine volcanoes, Yuji Sakuno, remote sensing specialist and associate professor at Hiroshima University's Graduate School of Advanced Science and Engineering, proposed a new indicator -- sea color.

The relationship between the chemical composition of discolored seawater and volcanic activity has been known for a long time. Still, there have been very few quantitative studies that used remote sensing to explore it. And among these few studies, only the reflectance pattern of discolored seawater has been analyzed.

"This is an extremely challenging research result for predicting volcanic disasters that have frequently occurred in various parts of the world in recent years using a new index called sea color," Sakuno said.

"I was the first in the world to propose the relationship between the sea color information obtained from satellites and the chemical composition around submarine volcanoes."

The findings of the study are published in the April 2021 issue of the journal Water.

Sakuno explained that volcanoes release chemicals depending on their activity, and these can change the color of the surrounding water. A higher proportion of iron can cause a yellow or brown discoloration, while increased aluminum or silicon can stain the water with white splotches.

One problem, however, is that sunlight can also play tricks on sea color. The study looked at how past research that chromatically analyzed hot spring water overcame this hurdle and fixed brightness issues. A relational model between seawater color and chemical composition was developed using the XYZ colorimetric system.

Sakuno examined images of Nishinoshima Island captured last year by Japan's GCOM-C SGLI and Himawari-8 satellites. Himawari-8 was used to observe volcanic activity and GCOM-C SGLI to get sea color data. GCOM-C SGLI's short observation cycle -- it takes pictures of the ocean every 2-3 days -- and high spatial resolution of 250 m makes it an ideal choice for monitoring.

Using the new indicator, Sakuno checked satellite data from January to December 2020 and was able to pick up signs of looming volcanic unrest in Nishinoshima Island approximately a month before it even started.

"In the future, I would like to establish a system that can predict volcanic eruptions with higher accuracy in cooperation with the Japan Aerospace Exploration Agency (JAXA), the Maritime Security Agency, which is monitoring submarine volcanoes, and related research," he said.


CAPTION

This image illustrates the colorimetric data of discolored seawater in four directions (north, east, south, and west) around Nishinoshima Island in 2020. The study investigated the color characteristics of the water to validate if the data obtained by SGLI accurately captures the actual conditions of the discolored seawater. It detected significant fluctuations in the distribution of chemicals in Nishinoshima Island, estimated from SGLI data, about one month even before the volcano became active.

CREDIT

Photo courtesy of Yuji Sakuno


 

Seismic monitoring of permafrost uncovers trend likely related to warming

SEISMOLOGICAL SOCIETY OF AMERICA

Research News

IMAGE

IMAGE: FIELD WORK AT SVALBARD : INSTALLATION OF THE TEMPORARY SEISMIC NETWORK AROUND THE ADVENTDALEN VALLEY IN MAY 2014. view more 

CREDIT: JULIE ALBARIC

Seismic waves passing through the ground near Longyearbyen in the Adventdalen valley, Svalbard, Norway have been slowing down steadily over the past three years, most likely due to permafrost warming in the Arctic valley. The trend, reported in a new study published in Seismological Research Letters, demonstrates how seismic monitoring can be used to track permafrost stability under global climate change. The study is part of a focus section in an upcoming issue of the journal on Arctic and Antarctic seismology.

Julie Albaric of the University of Bourgogne Franche-Comté, while employed at NORSAR (Norway), and colleagues used data collected from a variety of seismic networks and active seismic experiments to learn more about the seismic environment of the Adventdalen valley of Svalbard, and to understand more about the dynamics of permafrost in the region.

The researchers were able to detect seasonal variations in seismic wave velocity, which they attribute to changes in the ice content of shallow (2 to 4 meters deep) permafrost. Seismic waves move faster through solid materials like rock and ice, and slower through more liquid or softer material.

Shallow permafrost is sensitive to seasonal temperature changes, which would explain the seasonal variations in seismic velocity uncovered by Albaric, Daniela Kühn at NORSAR and their colleagues. But the researchers also found a linear decreasing trend in velocity between 2009 and 2011 after analyzing data collected by a permanent seismic network in the area, indicating an increasingly melted permafrost layer.

"To our knowledge it's the first study showing this long-term velocity trend," said Albaric. "Our study demonstrates that it is worth maintaining permanent observatories, such long-term data collections are precious, and that options for data use may turn up that were not the focus of the original installation."

Researchers are looking for ways to monitor permafrost because its stability can have a significant impact on global climate, with widespread melting potentially leading to an increase in greenhouse gas emissions.

Seismic monitoring can be a powerful tool to detect permafrost changes, especially since data are recorded continuously unlike some other geophysical methods, Albaric said. "In addition, seismic methods are very sensitive and depending on the network geometry, they allow us to target different depths and to cover large areas, allowing us to extend the very localized observations provided by borehole temperature measurements."

The ambient seismic activity noise on Svalbard consists of body waves (which move through the interior of the Earth), along with intermittent surface waves that occur when the average temperature rises above the freezing point. These surface waves have a cryogenic origin, the research team suggests.

The challenging Arctic environment makes it difficult to deploy, maintain and retrieve data from the networks, Kühn noted. "In the summer, for instance, the valley fills with a broad, braided river that limits where permanent seismometers can be installed. In the winter, cold temperatures, snow and ice are harsh on equipment and shrink the time when power can be supplied by solar panels."

"Meteorological conditions obviously make field work challenging," added Albaric, "particularly when installing the stations and using a keyboard without gloves at temperatures below -30°C."



CAPTION

The site of the SPITS array, Svalbard.

CREDIT

NORSTAR

Model predicts when rivers that cross faults will change course

Researchers created a model that uses the movement at fault lines to understand river flow and vice versa

UNIVERSITY OF CALIFORNIA - SANTA CRUZ

Research News

IMAGE

IMAGE: THIS AERIAL IMAGE OF THE SAN ANDREAS FAULT IN THE CARRIZO PLAIN SHOWS NUMEROUS CURVED DRAINAGES WHERE FAULT SLIP HAS STRETCHED STREAM CHANNELS TO THE LEFT. EVENTUALLY, THE CHANNELS GET... view more 

CREDIT: KELIAN DASCHER-COUSINEAU/B4 LIDAR PROJECT

As tectonic plates slip past each other, the rivers that cross fault lines change shape. The shifting ground stretches the river channels until the water breaks its course and flows onto new paths.

In a study published July 9 in Science, researchers at UC Santa Cruz created a model that helps predict this process. It provides broad context to how rivers and faults interact to shape the nearby topography.

The group originally planned to use the San Andreas fault in the Carrizo Plain of California to study how fault movement shapes the landscapes near rivers. But after spending hours pouring over aerial imagery and remote topographic data, their understanding of how the terrain evolves began to change. They realized that rivers play a more active role in shaping the area than once thought.

"The rivers are their own little beasts, and they interact in really interesting ways with the kinematics and the motion along these faults," said Kelian Dascher-Cousineau, seismology Ph.D. student at UC Santa Cruz and lead author on the study.

As the offset of a fault grows, it elongates river channels and slows the flow of water. With lower speeds, the river carries less sediment. The material builds up and eventually blocks the path, forcing the water to change course in a process known as avulsion.

This diversion happens rapidly, and the unexpected flooding can easily become destructive for nearby communities.

Over the last few years, geomorphologists have gained a clearer idea of how these avulsions happen in different types of rivers. But identifying long-term patterns in the way that rivers respond to fault movement still proves challenging.

"You can't really observe channels for thousands of years at a time," said Dascher-Cousineau. To make up for that inability, the researchers used the well-studied past of the San Andreas Fault at the Carrizo Plain to test their model.

"We have a history that we actually know really well from the earthquakes, and we can use that as a natural experiment to see what the channels are doing over these geomorphologically relevant timescales," said Dascher-Cousineau.

The group closely examined images and maps of the Carrizo Plain and began testing complex models of river flow and sediment transport. They slowly removed variables, eventually identifying the most important elements in the system. The resulting model introduces a new framework for thinking about how rivers and active fault-lines interact.

"Most seismologists typically have a view that the surface of the Earth is a passive thing that just responds to the faulting," said Noah Finnegan, professor of Earth and planetary sciences at UC Santa Cruz and co-author on the study.

"This paper embraced the fact that rivers are constantly changing and was able to show that the coevolution of the fault-offset and the river provides us with information that we weren't able to get previously," he said. "You get a richer understanding of how the system works by recognizing that there's an interesting coupling going on there."

In addition to predicting when fault-crossing rivers will abandon their original channels, the model can also help scientists estimate how quickly the sides of a fault are moving past one another--an important question to many seismologists that can be difficult to measure accurately.

"If you know something about how the river works, you can get quantitative constraints on the rate of slip on the fault, which is something that is a common goal of studies of faults," said Finnegan. "Alternatively, if you know something about the rate at which the fault is slipping, you can learn something about how efficient the river is at moving sediment, which is a basic question in almost every study of rivers and is almost impossible to know in a really accurate way."

Although it addresses complex questions, the model itself is surprisingly straightforward.

"Like with a lot of discoveries, once you see it in the right way, there's incredible simplicity," said Finnegan. "I'll never look at these landscapes in the same way again."

The group created the model while working entirely virtually--a challenge that Finnegan said inspired creativity.

"We were forced to look at remote topographic data and aerial imagery that made us think in a more synoptic way about this," he said.

How the model will fit different regions and the fault at a larger scale remains to be seen.

"We've outlined the set of physics that should operate in one range of conditions," said Dascher-Cousineau. Next, they will turn their focus to new types of topography.

###

Emily Brodsky, professor of Earth and planetary sciences at UCSC, is also a coauthor of the paper, in addition to Dascher-Cousineau and Finnegan. This research was supported by the NASA FINESST fellowship and the Southern California Earthquake Center.

Continental pirouettes

Supervolcano fed from Earth's mantle caused crustal plates to rotate

GFZ GEOFORSCHUNGSZENTRUM POTSDAM, HELMHOLTZ CENTRE

Research News

IMAGE

IMAGE: THE 3-D ILLUSTRATION SHOWS THE SO-CALLED MANTLE PLUME FEEDING THE SUPER VOLCANO WHICH FORCED THE PLATES APART. THE ARROWS INDICATE THE DIFFERENT MOVEMENTS. view more 

CREDIT: ALISHA STEINBERGER

The plates of the Earth's crust perform complicated movements that can be attributed to quite simple mechanisms. That is the short version of the explanation of a rift that began to tear the world apart over a length of several thousand kilometers 105 million years ago. The scientific explanation appears today in the journal Nature Geoscience.

According to the paper, a super volcano split the Earth's crust over a length of 7,500 kilometers, pushing the Indian Plate away from the African Plate. The cause was a "plume" in the Earth's mantle, i.e. a surge of hot material that wells upwards like an atomic mushroom cloud in super slow motion. It has long been known that the Indian landmass thus made its way northward and bumped into Eurasia. But a seemingly counterintuitive east-west movement of the continental plates was also part of the process. This is supported by calculations by a team led by Dutch scientist Douwe van Hinsbergen (Utrecht University) and Bernhard Steinberger (GFZ German Research Centre for Geosciences).

According to the findings, the Indian Plate did not simply move away from Africa, but rotated in the process. The reason for this is the subcontinent, whose land mass acts on the much larger continental plate like an axis around which the entire plate rotates. In the south, the scissors opened, in the north they closed - there, mountain-building processes and the subduction of crustal plates were induced.

This has dramatic effects up to the present time: The subduction processes continue and trigger earthquakes again and again in the Mediterranean region between Cyprus and Turkey. The traces of the plume and the supervolcano can still be identified today. They are flood basalts on Madagascar and in the southwest of India. They testify to immense volcanic activity fed by the mantle plume.

Bernhard Steinberger has calculated the movement and pressure that the super volcano near present-day Madagascar could cause further north on the Arabian Peninsula and in what is now the Mediterranean. He has also published a "kitchen table experiment" on Youtube, which illustrates the movements. Link: https://www.youtube.com/watch?v=1VzCzg2KRgg

###

Original study:

Douwe J.J. van Hinsbergen, Bernhard Steinberger, Carl Guilmette, Marco Maffione, Derya Gürer, Kalijn Peters, Alexis Plunder, Peter McPhee, Carmen Gaina, Eldert L. Advokaat, Reinoud L.M. Vissers, Wim Spakman, "A record of plume-induced plate rotation triggering subduction initiation", Nature Geoscience https://doi.org/10.1038/s41561-021-00780-7.