COVID-19 reduced US life expectancy, especially among Black and Latino populations

Life expectancy at birth will shorten by more than one year

UNIVERSITY OF SOUTHERN CALIFORNIA

NEWS RELEASE 14-JAN-2021

Research News

 

The COVID-19 pandemic, which claimed more than 336,000 lives in the United States in 2020, has significantly affected life expectancy, USC and Princeton researchers have found.

The researchers project that, due to the pandemic deaths last year, life expectancy at birth for Americans will shorten by 1.13 years to 77.48 years, according to their study published Thursday in the Proceedings of the National Academy of Sciences.

That is the largest single-year decline in life expectancy in at least 40 years and is the lowest life expectancy estimated since 2003.

The declines in life expectancy are likely even starker among minority populations. For Blacks, the researchers project their life expectancy would shorten by 2.10 years to 72.78 years, and for Latinos, by 3.05 years to 78.77 years.

Whites are also impacted, but their projected decline is much smaller -- 0.68 years -- to a life expectancy of 77.84 years.

Overall, the gap in life expectancy between Blacks and whites is projected to widen by 40%, from 3.6 to more than 5 years -- further evidence of the disease's disparate impact on disadvantaged populations.

"Our study analyzes the effect of this exceptional number of deaths on life expectancy for the entire nation, as well as the consequences for marginalized groups," said study author Theresa Andrasfay, a postdoctoral fellow at the USC Leonard Davis School of Gerontology. "The COVID-19 pandemic's disproportionate effect on the life expectancy of Black and Latino Americans likely has to do with their greater exposure through their workplace or extended family contacts, in addition to receiving poorer health care, leading to more infections and worse outcomes."

COVID-19 appears to have eliminated many of the gains made in closing the Black-white life expectancy gap since 2006. Latinos, who have consistently experienced lower mortality than whites -- a phenomenon known as the "Latino paradox" -- would see their more than three-year survival advantage over whites reduced to less than one year.

"The huge decline in life expectancy for Latinos is especially shocking given that Latinos have lower rates than the white and Black populations of most chronic conditions that are risk factors for COVID-19," said study co-author Noreen Goldman, the Hughes-Rogers Professor of Demography and Public Affairs at the Princeton School of Public and International Affairs. "The generally good health of Latinos prior to the pandemic, which should have protected them from COVID-19, has laid bare the risks associated with social and economic disadvantage."

The study's authors estimated life expectancy at birth and at age 65 for 2020 for the total U.S. population and by race and ethnicity. They used four scenarios of deaths -- one in which the COVID-19 pandemic had not occurred and three others that include COVID-19 mortality projections by the Institute for Health Metrics and Evaluation, an independent global health research center at the University of Washington.

"The bigger reductions in life expectancy for the Black and Latino populations result in part from a disproportionate number of deaths at younger ages for these groups," Goldman said. "These findings underscore the need for protective behaviors and programs to reduce potential viral exposure among younger individuals who may not perceive themselves to be at high risk."

Life expectancy as an indicator of population health

Of the analyzed deaths for which race and ethnicity have been reported to the National Center for Health Statistics, 21% were Black and 22% Latino. Black and Latino Americans have experienced a disproportionate burden of coronavirus infections and deaths, reflecting persistent structural inequalities that heighten risk of exposure to and death from COVID-19.

The researchers say life expectancy is an important indicator of a population's health and an informative tool for examining the impact of COVID-19 on survival.

In the decades before the COVID-19 pandemic, annual improvements in U.S. life expectancy had been small but overall life expectancy had rarely declined. An exception was the annual reduction of 0.1 year for three consecutive years -- 2015, 2016, and 2017 -- which were attributed in part to increases in so-called "deaths of despair" among middle-aged whites related to drug overdoses, including opioids, as well as alcohol-related liver disease and suicide.

The projected pandemic-related drop in life expectancy is about 10 times as large as the declines seen in recent years.

The last major pandemic to significantly reduce life expectancy in a short period of time was the 1918 influenza pandemic, which research indicates reduced life expectancy by an extraordinary 7-12 years.

As of Wednesday, more than 10 million Americans had received their first COVID-19 vaccination dose, according to the U.S. Centers for Disease Control and Prevention. But the vaccines may not be enough to immediately reverse the impact of the disease on U.S. life expectancy.

"While the arrival of effective vaccines is hopeful, the U.S. is currently experiencing more daily COVID-19 deaths than at any other point in the pandemic," Andrasfay said. "Because of that, and because we expect there will be long-term health and economic effects that may result in worse mortality for many years to come, we expect there will be lingering effects on life expectancy in 2021."

"That said," she added, "no cohort may ever experience a reduction in life expectancy of the magnitude attributed to COVID-19 in 2020."

The study authors say they are now studying occupational exposures to COVID-19 by race and ethnicity to further comprehend its disproportionate impact.

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The research was supported by the National Institute on Aging (grant number T32AG000037).

 

COVID-19: Science scepticism may be reinforced by UK rush to approve vaccines

SAGE

Research News

 

Former director of public health Professor John Ashton has said that scientific scepticism may be reinforced by the UK's rush to approve COVID vaccines for public use and the apparent political desire to be the first out of the blocks in contrast to our European neighbours.

Writing in the Journal of the Royal Society of Medicine, Prof Ashton says that to risk the trust of the public for the sake of a couple of weeks propaganda advantage could prove to be unforgivable should vaccine uptake fall below that required for the ubiquitous 'herd immunity' as a result of giving oxygen to the sceptics.

"In this age of scientific rationality, superstition and anti-science still run deep," he writes. "When an overwhelming majority of the public welcomes the arrival of COVID vaccination, it is salutary to remind ourselves of the main arguments deployed against its value and use."

As well as the readily understood fear of injections, Prof Ashton writes that other objections have included that vaccination is 'unchristian', that it is an infringement of personal liberty and that it is part of a more general suspicion of scientific medicine.

In his paper, Prof Ashton draws on the experience of the Victorian anti-vaccination leagues which were set up in the 19th century to campaign against smallpox vaccination and which offer a history lesson on the breakdown of trust between the government and the public.

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Temperature scanners of limited value in detecting Covid-19

THE PHYSIOLOGICAL SOCIETY

Research News

 

Making people stand in front of a scanner to have their body temperature read can result in a large number of false negatives, allowing people with Covid-19 to pass through airports and hospitals undetected.

Leading experts in physiology have suggested instead that taking temperature readings of a person's fingertip and eye would give a significantly better and more reliable reading and help identify those with fever. The study is published in Experimental Physiology.

Professor Tipton, of the University of Portsmouth, said: "If scanners are not giving an accurate reading, we run the risk of falsely excluding people from places they may want, or need, to go, and we also risk allowing people with the virus to spread the undetected infection they have."

The study found four key factors:

• Temperature alone isn't a good indicator of disease -- not all who have the virus have a fever and many who do, develop one only after admission to hospital;
• Measuring skin temperature doesn't give an accurate estimation of deep body temperature (raised in a fever). A direct measure of deep body temperature is impractical;
• A high temperature, even one taken from deep body, does not necessarily mean a person has Covid-19; and
• Taking two temperature measurements, one of the finger, the other of the eye, is likely to be a better and more reliable indicator of a fever-induced increase in deep body temperature.

Professor Tipton said: "Using a surface temperature scanner to obtain a single surface temperature, usually the forehead, is an unreliable method to detect the fever associated with Covid-19. Too many factors make the measurement of a skin temperature a poor surrogate for deep body temperature; skin temperature can change independently of deep body temperature for lots of reasons. Even if such a single measure did reflect deep body temperature reliably, other things, such as exercise can raise deep body temperature.

"The pandemic has had a devastating global effect on all aspects of our lives, and unfortunately, it's unlikely to be the last pandemic we face. It's critical we develop a method of gauging if an individual has a fever that's accurate and fast."

The most common symptom of 55,924 confirmed cases of Covid-19 reported in China up to February 22, 2020 was fever, followed by other symptoms, including dry cough, sputum production, shortness of breath, muscle or joint pain, sore throat, headache chills, nausea or vomiting, nasal congestion, and diarrhoea.

However, the researchers say a significant proportion (at least 11 %) of those with Covid-19 do not have a fever, and that fewer than half those admitted to hospital with suspected Covid-19 had a fever. Although the majority of positive cases go on to develop a high temperature after being admitted to hospital, they were infectious before their temperature soared.

Professor Tipton said: "We think we can improve the identification of the presence of fever using the same kit but looking at the difference between eye and finger temperature - it's not perfect, but it is potentially better and more reliable."

The same scanners can easily be adapted to take these two measurements.

The new study argues that taking temperature readings of a person's fingertip and eye would give a significantly better and more reliable reading and help identify those with fever.

A change in deep body temperature is a critical factor in diagnosing disease with as little as a one degree increase indicating a potential disease.

The many methods of detecting deep body temperature, widely used in hospitals, are too expensive, invasive and time consuming to be widely used outside hospitals.

Professor Tipton said: "During the SARS epidemic, in 2003, there was a need for a fast, effective mass screening method and infrared thermography became and remains the cornerstone measurement, despite concerns over its reliability."

A 2005 study of 1,000 people comparing forehead temperature with three different infrared thermometers gave different temperatures, ranging from 31 °C to 35.6 °C. The infrared thermometers measurements alone varied by as much as 2 °C. In another study, more than 80 per cent of the 500 people tested using infrared, gave a false negative result.

Such differences in skin temperature could be due to a range of reasons, including whether the individual has recently exercised, has an infection, sunburn or recently drunk alcohol, how close an individual stands to a scanner, how warm or cool the air is, how much fat a person has on their body and even their blood pressure.

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Scientists discover the secret of Galápagos' rich ecosystem

UNIVERSITY OF SOUTHAMPTON

 Research News

 

IMAGE: A GALÁPAGOS TOROISE view more 

CREDIT: ALEXANDER FORRYAN

New research has unlocked the mystery of how the Galápagos Islands, a rocky, volcanic outcrop, with only modest rainfall and vegetation, is able to sustain its unique wildlife habitats.

The Galápagos archipelago, rising from the eastern equatorial Pacific Ocean some 900 kilometres off the South American mainland, is an iconic and globally significant biological hotspot. The islands are renowned for their unique wealth of endemic species, which inspired Charles Darwin's theory of evolution and today underpins one of the largest UNESCO World Heritage Sites and Marine Reserves on Earth.

Scientists have known for decades that the regional ecosystem is sustained by upwelling of cool, nutrient-rich deep waters, which fuel the growth of the phytoplankton upon which the entire ecosystem thrives.

Yet despite its critical life-supporting role, the upwelling's controlling factors had remained undetermined prior to this new study. Establishing these controls, and their climate sensitivity, is critical to assessing the resilience of the regional ecosystem against modern climatic change.

In this new research, published in Nature Scientific Reports, scientists from the University of Southampton, National Oceanography Centre and Universidad San Francisco de Quito in Ecuador used a realistic, high-resolution computer model to study the regional ocean circulation around the Galápagos Islands.

This model showed that the intensity of upwelling around the Galápagos is driven by local northward winds, which generate vigorous turbulence at upper-ocean fronts to the west of the islands. These fronts are areas of sharp lateral contrasts in ocean temperature, similar in character to atmospheric fronts in weather maps, but much smaller.

The turbulence drives upwelling of deep waters toward the ocean surface, thus providing the nutrients needed to sustain the Galápagos ecosystem.

Alex Forryan of the University of Southampton, who performed the research, said: "Our findings show that Galápagos upwelling is controlled by highly localised atmosphere-ocean interactions. There now needs to be a focus on these processes when monitoring how the islands' ecosystem is changing, and in mitigating the ecosystem's vulnerability to 21st -century climate change."

Professor Alberto Naveira Garabato, also of the University of Southampton, who led the project supporting the research, said: "This new knowledge of where and how the injection of deep-ocean nutrients to the Galapagos ecosystem happens is informing ongoing plans to expand the Galápagos Marine Reserve, and improve its management against the mounting pressures of climate change and human exploitation."

CAPTION

Iguana on the Galápagos Islands

Spectacular fossil discovery:

150 million-year-old shark was one of the largest of its time

UNIVERSITY OF VIENNA

 NEWS RELEASE 14-JAN-2021

Research News

 

IMAGE: TENTATIVE LIFE RECONSTRUCTION OF THE HYBODONTIFORM SHARK ASTERACANTHUS; FOR SCALE SEE SILHOUETTES AT THE RIGHT LOWER CORNER view more 

CREDIT: © SEBASTIAN STUMPF/FABRIZIO DE ROSSI

In a new study, an international research team led by Sebastian Stumpf from the University of Vienna describes an exceptionally well-preserved skeleton of the ancient shark Asteracanthus. This extremely rare fossil find comes from the famous Solnhofen limestones in Bavaria, which was formed in a tropical-subtropical lagoon landscape during the Late Jurassic, about 150 million years ago. The almost complete skeleton shows that Asteracanthus was two-and-a-half meters long in life, which makes this ancient shark one of the largest of its time. The study is published in the journal Papers in Palaeontology.

Cartilaginous fishes, which include sharks and rays, are one of the most successful vertebrate groups still alive today. Due to their life-long tooth replacement, teeth of cartilaginous fishes are among the most common fossil vertebrate finds. However, the low preservation potential of their cartilaginous skeletons prevents fossilization of completely preserved specimens in most cases. The extremely rare preservation of fossil cartilaginous fish skeletons is therefore linked to special conditions during fossilization and restricted to a few fossil-bearing localities only.

The Solnhofen limestones in Bavaria, Germany, which were formed during the Late Jurassic, about 150 million years ago, is such a rare occurrence. They are world-renowned for having produced skeletons of the small feathered dinosaur Archaeopteryx and have yielded numerous shark and ray skeletons, recovered during excavations over the past 150 years. A new study published in the journal Papers in Palaeontology and led by the paleontologist Sebastian Stumpf from the University of Vienna presents the largest fossil shark skeleton that has ever been discovered in the Solnhofen limestones. The specimen is represented by an almost completely preserved skeleton of the extinct hybodontiform shark Asteracanthus, the total length of which was two-and-a-half meters in life, which made it a giant among Jurassic sharks.

Hybodontiform sharks, which are the closest relatives of modern sharks and rays, first appeared during the latest Devonian, about 361 million years ago, and went extinct together with dinosaurs at the end of the Cretaceous, about 66 million years ago. They had two dorsal fins, each supported by a prominent fin spine. The body size of hybodontiform sharks ranged from a few centimeters to approximately three meters in maximum length, which consequently makes Asteracanthus one of the largest representatives of both its group and its time. In contrast, modern sharks and rays, which were already diverse during the Jurassic, only reached a body size of up to two meters in maximum length in very rare cases.

Asteracanthus was scientifically described more than 180 years ago by the Swiss-American naturalist Louis Agassiz on the basis of isolated fossil dorsal fin spines. However, articulated skeletal remains have never been found - until now. The dentition of the skeleton is exceptionally well-preserved and contains more than 150 teeth, each with a well-developed central cusp that is accompanied on both sides by several smaller cusplets. "This specialized type of dentition suggests that Asteracanthus was an active predator feeding on a wide range of prey animals. Asteracanthus was certainly not only one of the largest cartilaginous fishes of its time, but also one of the most impressive." says Sebastian Stumpf.

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Publication in Papers in Palaeontology: Stumpf, S., López-Romero, F.A., Kindlimann, R., Lacombat, F., Pohl, B. & Kriwet, J. 2020. A unique hybodontiform skeleton provides novel insights into Mesozoic chondrichthyan life. Papers in Palaeontology.

DOI: https://doi.org/10.1002/spp2.1350

How aerosols are formed

ETH ZURICH

Research News

 

IMAGE: THE EXPERIMENTAL SETUP IN AN ETH ZURICH LABORATORY. view more 

CREDIT: ETH ZURICH / RUTH SIGNORELL

Aerosols are suspensions of fine solid particles or liquid droplets in a gas. Clouds, for example, are aerosols because they consist of water droplets dispersed in the air. Such droplets are produced in a two-step process: first, a condensation nucleus forms, and then volatile molecules condense onto this nucleus, producing a droplet. Nuclei frequently consist of molecules different to those that condense onto them. In the case of clouds, the nuclei often contain sulphuric acids and organic substances. Water vapour from the atmosphere subsequently condenses onto these nuclei.

Scientists led by Ruth Signorell, Professor at the Department of Chemistry and Applied Biosciences, have now gained new insights into the first step of aerosol formation, nucleation. "Observations have shown that the volatile components can also influence the nucleation process," Signorell says, "but what was unclear was how this was happening at the molecular level." Previously it was impossible to observe the volatile components during nucleation in an experimental setting. Even in a famous CERN experiment on cloud formation, the "Cloud" experiment, certain volatile components could not be directly detected.

Volatile components detected for the first time

The ETH researchers developed an experiment aimed at the first microseconds of the nucleation process. In the experiment, the particles formed remain intact during this time and can be detected using mass spectrometry. The scientists looked at nucleation in various gas mixtures containing CO2 and for the first time, they were able to detect the volatile components as well - in this case, the CO2. The researchers could show that the volatile components were essential for the formation of nuclei and also accelerated this process.

An analysis of the experimental data revealed that this acceleration is the result of the volatile components catalysing the nucleation of other, less volatile components. They do this by forming short-lived, heterogeneous molecular aggregates, known as chaperon complexes. "Because temperature determines the volatility of gas components, it also plays a decisive role in these processes," Signorell explains.

One reason the new research results are interesting is that they improve the understanding of nucleation, its molecular mechanisms and speed, in order to properly account for it in models for, say, cloud formation in the atmosphere. In addition, the results should help to improve the efficiency of technical processes for producing aerosols - such as the use of rapid cooling to capture CO2 from natural gas.

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Reference
Li C, Krohn J, Lippe M, Signorell R: How volatile components catalyze vapor nucleation, Science Advances, 13 January 2021, doi: 10.1126/sciadv.abd9954

Measuring the belowground world

Researchers call for greater consideration of soil biodiversity and functions in international conservation strategies

GERMAN CENTRE FOR INTEGRATIVE BIODIVERSITY RESEARCH (IDIV) HALLE-JENA-LEIPZIG

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VIDEO: AUTHORS EXPLAIN THE MESSAGE OF THEIR SCIENCE PAPER FROM JANUARY 2021: THE IMPORTANCE OF SOIL BIODIVERSITY AND FUNCTIONING BEYOND AGRICULTURAL NEEDS MUST BE ACKNOWLEDGED IN ALL NATURE CONSERVATION STRATEGIES. TO... view more 

CREDIT: CARLOS GUERRA

If you asked people which group of animals is the most abundant on earth, hardly anyone would know the right answer. Ants? Fish? No, and not humans either. The answer is nematodes, also known as roundworms. Four out of five animals on earth belong to this group, and the reason hardly anyone is aware of the fact is that they live underground, invisible to us. Together with thousands of other soil organisms, they quietly, discreetly and constantly perform enormously important services for the world above them.

The soil is one of the most species-rich habitats in existence. Living under one square meter of healthy soil you can find up to 1.5 kilograms of organisms: among others, roundworms, earthworms, springtails, mites and insect larvae. There is also a multitude of microorganisms including bacteria, protists and fungi. They eat and transform living and dead animal and plant material into nutrients which become the basis for growth and new life. Without soil organisms, no plants would be able to grow and no humans could live.

It is therefore all the more astonishing that soils have so far hardly featured in international strategies for protecting biodiversity. The authors of the new article in Science see this as a big problem: "If we do not protect soils for the next generations, aboveground biodiversity and food production cannot be guaranteed either". Their appeal goes out to the 196 nations who are currently negotiating a new strategy to protect biodiversity within the framework of the UN Convention on Biological Diversity (CBD).

CAPTION

Collembola, such as this Acanthanura sp., can be useful indicators of soil quality and also the focus of nature conservation measures.

Healthy soils are becoming increasingly rare. They suffer the burden of intensive cultivation with heavy machinery, fertilisers and pesticides, are compacted, built over or are lost due to wind and water erosion. Global warming is putting them under additional pressure. According to the German Heinrich Böll Foundation, around 24 billion tons of fertile soil are lost worldwide every year. As a result, the soils' wide variety of services such as water purification and protection against plant diseases gradually decline. In addition, soils are the most important carbon reservoir on earth and therefore help slow global climate warming.

Call for greater consideration of soil biodiversity in global biodiversity protection strategies

According to the researchers, these services are given far too little attention in the political debate. "Up to now, soil conservation has been mostly reduced to the impacts related to soil erosion and its importance for agriculture," said first author Dr Carlos Guerra (iDiv, MLU). "It's about time that soil conservation policies consider the protection of soil organisms and ecosystem functions more than just for food production and other productive systems. Soil biodiversity monitoring and conservation can support the achievement and tracking of many sustainability goals, targeting areas such as climate, food and biodiversity protection."

"Protection measures have so far mainly focused on life above ground, for example in the designation of protected areas", said senior author Dr Diana Wall from Colorado State University. However, since these do not necessarily benefit underground biodiversity, the specific needs of the biotic communities in the soil have to be taken into account.

CAPTION

Earthworms are the architects of the soil. They mix the soil layers, form a network of burrows essential for soil water, air and nutrient dynamics, and decompose dead materia

Establishing global monitoring network Soil BON

In order to be able to decide which regions of the world are particularly in need of protection, and which protective measures are appropriate, sufficient information must be available on the status and trends of biodiversity in soils. Since this has not been the case so far, the researchers launched the Soil BON monitoring network. "We want to move biodiversity in soils into the focus of conservation efforts. To do this, we must provide policymakers with the necessary information to support decision-making," said senior author Prof Nico Eisenhauer, research group leader at iDiv and Leipzig University. "Soil BON will produce and support the production of the relevant data to achieve this goal."

The purpose of Soil BON is to help gather equivalent soil data, comprehensively and over extended periods of time. What is required is an internationally recognised standard which sets out what is to be recorded and how. The researchers propose a holistic system for this: the so-called Essential Biodiversity Variables (EBVs). EBVs are key parameters for measuring biodiversity. The concept was developed by, among others, iDiv and includes criteria such as soil respiration, nutrient turnover and genetic diversity. Indicators are derived from the EBVs which then serve as a basis for soil status evaluation and subsequent decisions regarding the level and type of protection necessary for the soils.

According to the researchers, their proposed monitoring and indicator system will enable the worldwide condition of soils and their capacity to function to be recorded efficiently and monitored long term. They emphasise that it also serves as an important early warning system; with its help, it will be possible to identify, at an early stage, whether existing nature conservation goals can be achieved with current measures.

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Posidonia marine seagrass can catch and remove plastics from the sea

A trap for plastics in coastal areas

UNIVERSITY OF BARCELONA

Research News

 

IMAGE: IN THE GRASSLANDS, THE PLASTICS ARE INCORPORATED TO AGGLOMERATES OF NATURAL FIBER WITH A BALL SHAPE (AEGAGROPILA OR POSIDONIA NEPTUNE BALLS). view more 

CREDIT: UNIVERSITY OF BARCELONA

Posidonia oceanica seagrass -an endemic marine phanerogam with an important ecological role in the marine environment- can take and remove plastic materials that have been left at the sea, according to a study published in the journal Scientific Reports. The article's first author is the tenure-track 2 lecturer Anna Sànchez-Vidal, from the Research Group on Marine Geosciences of the Faculty of Earth Sciences of the University of Barcelona (UB).

The study describes for the first time the outstanding role of the Posidonia as a filter and trap for plastics in the coastal areas, and it is pioneer in the description of a natural mechanism to take and remove these materials from the sea. Other authors of the study are the experts Miquel Canals, William P. de Haan and Marta Veny, from the Research Group on Marine Geosciences of the UB, and Javier Romero, from the Faculty of Biology and the Biodiversity Research Institute (IRBio) of the UB.

A trap for plastics in coastal areas

The Posidonia oceanica makes dense prairies that make a habitat with a great ecological value (nutrition, shelter, reproduction, etc.) for marine biodiversity. As part of the study, the team analysed the trapping and extraction of plastic in great seagrasses of the Posidonia in the coasts of Majorca. "Everything suggests that plastics are trapped in the Posidonia seagrass. In the grasslands, the plastics are incorporated to agglomerates of natural fiber with a ball shape -aegagropila or Posidonia Neptune balls- which are expulsed from the marine environment during storms", notes Anna Sànchez-Vidal, member of the Department of Ocean and Earth Dynamics of the UB.

"According to the analyses -she continues- the trapped microplastics in the prairies of the Posidonia oceanica are mainly filaments, fibers and fragments of polymers which are denser than the sea water such as polyethylene terephthalate (PET).

How are Posidonia Neptune balls made?

This marine phanerogam has a vegetative structure made by a modified stem with a rhizome shape from which the roots and leaves appear. When the leaves fall, its bases (pods) are added to rhizomes and give them a feather-like appearance. "As a result of the mechanical erosion in the marine environment, those pods under the seafloors are progressively releasing lignocellulosic fibres which are slowly added and intertwined until they make agglomerates in a ball-shape, known as aegagropilae. Aegagropilae are expulsed from prairies during periods of strong waves and a certain part ends up in the beaches", says Professor Javier Romero, from the Department of Evolutionary Biology, Ecology and Environmental Sciences and the Biodiversity Research Institute (IRBio) of the UB.

Posidonia aegagropilae are expelled from the prairies during periods of strong waves and a part ends up piled in the beaches. Although there are no studies that quantify the amount of aegagropilae expelled from the marine environment, it is estimated that about 1,470 plastics are taken per kilogram of plant fibre, amounts which are significantly higher than those captured through leaves or sand. As researcher Anna Sànchez-Vidal says, "we cannot completely know the magnitude of this plastic export to the land. However, first estimations reveal that Posidonia balls could catch up to 867 million plastics per year".

CAPTION

This natural mechanism could trap about 867 million plastic per year in coastal areas.

Plastic-free oceans: everyone's responsibility

The polluting footprint of plastics that come from human activity is a serious environmental problem affecting coastal and ocean ecosystems worldwide. Since plastics were created massively in the 20th century fifties, these materials have been left and accumulated at the sea -seafloors act as a sink for microplastics-- and are transported by ocean currents, wind and waves. "The plastics we find floating in the sea are only a small percentage of everything we have thrown onto the marine environment", warns Anna Sànchez-Vidal.

The paper published in the journal Scientific Reports has been carried out within the frame of the subject of the EHEA bachelor's degree final project of the degree in Marine Sciences of the Faculty of Earth Sciences, and counted on the support from the Scientific and Technological Centers of the UB (CCiTUB). The new ecosystemic service of the Posidonia described in the article has a significant value in a marine area such as the Mediterranean -with high quantities of floating plastic and in the seafloors-- and with Posidonia seagrass that can occupy large areas up to forty meters deep.

"This is why we need to protect and preserve these vulnerable ecosystems. However, the best environmental protection strategy to keep oceans free of plastic is to reduce landfills, an action that requires to limit its use by the population", conclude the experts.

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Teeth pendants speak of the elk's prominent status in the Stone Age

UNIVERSITY OF HELSINKI

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IMAGE: A TOTAL OF 90 ELK TEETH WERE PLACED NEXT TO THE HIPS AND THIGHS OF THE BODY IN GRAVE 127, POSSIBLY ATTACHED TO A GARMENT RESEMBLING AN APRON. THERE WERE... view more 

CREDIT: DRAWING BY TOM BJORKLUND

Roughly 8,200 years ago, the island of Yuzhniy Oleniy Ostrov in Lake Onega in the Republic of Karelia, Russia, housed a large burial ground where men, women and children of varying ages were buried. Many of the graves contain an abundance of objects and red ochre, signifying the wish to ensure the comfort of the buried also after death. Pendants made of elk incisors were apparently attached to clothing and accessories, such as dresses, coats, cloaks, headdresses and belts. Although no clothing material has been preserved, the location of the elk teeth sheds light on the possible type of these outfits.

A people of grooved elk tooth pendants

A study headed by archaeologist Kristiina Mannermaa, University of Helsinki, aimed to determine who the people buried in outfits decorated with elk tooth ornaments were, and what the pendants meant to them. The study analysed the manufacturing technique of a total of more than 4,000 tooth ornaments, or the way in which the teeth had been processed for attachment or suspension. The results were surprising, as practically all of the teeth had been processed identically by making one or more small grooves at the tip of the root, which made tying the pendants easier. Only in two instances had a small hole been made in the tooth for threading, both of which were found in the grave of the same woman. The tooth pendants found in graves located in the Baltic area and Scandinavia from the same period as the Yuzhniy Oleniy Ostrov graves are almost exclusively perforated. Perforation is the surest way of fastening the pendant, but making holes in the narrow tip of a tooth is more laborious than grooving.

Archaeological and ethnographic research has shown that humans have been using decorations almost always and everywhere in the world, for several different purposes. To many indigenous peoples in Eurasia, including the Sámi communities, decorations have been and still are an important way of describing a person's identity and origin. They are not only aesthetic details, but also connected to intercommunity communication and the strengthening of intracommunity uniformity. External elements such as ornaments can also influence the names which neighbouring groups use to refer to a community. In fact, Kristiina Mannermaa calls the people found in the burial site the people of grooved elk tooth pendants.

"Even though there are pendants made of beaver and bear teeth in the graves, the share of elk teeth in them is overwhelming," Mannermaa says.

Typically, only one or at the most a couple of different groove types were prevalent in individual graves. This indicates that the pendants found in a specific grave or cluster were the result of routine serial production of sorts carried out in a fairly short period of time. The most common groove types were firm as well as quick and easy to make.

"Interestingly, the grooves were not always made on the broadest side of the tooth, which would be the easiest option. In many graves, the grooves are on the thin side of the tooth where the unstable position of the tooth makes them harder to do. The artisan may have resorted to this method in order to tie them in a specific position," researcher Riitta Rainio notes.

The highest number of elk teeth were found in the graves of young adult women and men, the lowest in those of children and elderly people. In other words, elk tooth ornaments were in one way or another linked to age, possibly specifically to the peak reproductive years.

Elk was the most important animal in the ideology and beliefs of the prehistorical hunter-gatherers of the Eurasian forest zone, and their limited availability made elk teeth a valuable material to ancient hunters. Elks were not brought down very often, and not all members of the community contributed to hunting. It may be that a single individual was given all of the incisors of a caught elk. Elks have a total of eight incisors, six permanent ones in the lower jaw and two permanent canines in the shape of incisors. At times, corresponding deciduous teeth were also processed into ornaments. The largest ornaments required the teeth of at least 8 to 18 elks.

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In addition to Mannermaa, Riitta Rainio from the University of Helsinki as well as Evgeniy Yurievich Girya and Dmitriy Gerasimov from Peter the Great's Museum of Anthropology and Ethnography contributed to the study.