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Tag: Environment

Microplastics Increase Toxicity of Organic Pollutants by a Factor of 10

Written by AUFTAU on . Posted in Newsroom.

May cause severe damage to our health.

Microplastics are tiny fragments of plastic that are found almost everywhere: in wells, soil, food products, water bottles, and even in glaciers at the North Pole. A new study by Tel Aviv University researchers found that in a marine environment, microplastics encounter environmental pollutants that attach to their surface and increase their toxicity by a factor of 10, which may cause severe harm to the environment and human health.

The study was conducted by Dr. Ines Zucker of the School of Mechanical Engineering and the Porter School of the Environment and Earth Sciences at Tel Aviv University, together with Ph. D. student Andrey Eitan Rubin. The study was recently published in the prestigious journal Chemosphere.

‘Magnets’ for Environmental Pollutants

In the study, the researchers examined the entire process that the microplastic undergoes, from the interactions it has with environmental pollutants to the release of the pollutants and the creation of increased toxicity.

The researchers found that adsorption of those organic pollutants to the microplastics increases toxicity by a factor of 10 and may also cause severe impact on humans who are exposed to contaminated food and drink.

“In this study we showed that even very low concentrations of environmental pollutants, which are non-toxic to humans, once adsorb to the microplastic result in significant increase in toxicity,” says Dr. Zucker. “This is because microplastics are a kind of ‘magnet’ for environmental pollutants, concentrating them on its surfaces, ‘ferrying’ them through our digestive tract, and releasing them in a concentrated form in certain areas – thus causing increased toxicity.”

 

From left to right: Ph. D. student Andrey Eitan Rubin, Dr. Ines Zucker and Dr. Amit Kumar Sarkar

Not Just a Remote Problem

Ph. D. student Andrey Eitan Rubin adds: “For the first time we are presenting a complete ‘life cycle’ of microplastics: from the moment of their release into the environment, through the adsorption of environmental pollutants and up to their joint toxicity in humans.”

“The amount of waste dumped into the ocean every year is enormous – the best known example is the plastic island in the Pacific Ocean, which has an area 80 times larger than the State of Israel.”

This is not just a remote problem. The researchers’ preliminary monitoring data show that Israel’s shores are among the most polluted with microplastic waste. “Each of the microplastic particles secreted in these areas has tremendous potential for harm, as they serve as an effective and stable platform for any pollutant that they may encounter on their way to the human body,” warns Rubin.

                                                                                                                   “This is another painful reminder of the dire consequences of polluting the marine and terrestrial environment with hazardous industrial waste, which has unfortunately been saturated with plastic in recent decades. The dangers are not theoretical but are more tangible than ever. Although there is a great deal of awareness of this problem, the preventive measures in the field are still far from imprinting a significant mark,” concludes Dr. Zucker.

Reading Tea Leaves

Written by AUFTAU on . Posted in Magazine, Newsroom.

What is the origin of tea, and does the climate crisis threaten its production?

Tea – the ancient beverage comes in different flavors and colors. The Queen of England will never go without her afternoon tea, in India it’s enjoyed with milk and spices and we all like to pour ourselves an occasional cup of Earl Grey, especially when winter comes knocking. But have you ever wondered whether the saying “all the tea in China” really does indicate where tea drinking started? Or if the soothing drink may be affected by the climate crisis? Should we, in fact, be drinking it? We have, and our researchers explained, surprised us and busted some myths in the process.

When the Chinese Mystics Met the Tea Plant

We’re not going to keep you in suspense: It turns out that the coveted drink was sipped by the Indian Buddhist monks two thousand years ago – long before it became an integral part of Chinese culture and a long, long time before it became popular in Western cultures.

“The tea plant was known in China as early as the first centuries BCE, but recent studies show that the custom of drinking tea was brought to China from India,” explains Prof. Meir Shahar from The Department of East Asian Studies of The Lester and Sally Entin Faculty of Humanities at Tel Aviv University, who researches, among other things, the influence of Indian culture on Chinese religion and literature.

“In the first centuries CE Buddhism came to China from India and the Buddhist monks, who wanted to stay awake during the meditation, used to drink tea. The Chinese monks would observe this, and went on to adopt the custom as well, which then continued to spread to the rest of the Chinese population.”

While tea originates from India, the origin of the word ‘tea’ in most of the world’s languages, however, is Chinese. “In northern China it is called cha, hence the Russian chai, and in southern China it is pronounced as tcha, which is the origin of the English word tea,” reveals Prof. Shahar.

Buddhist monks on their tea break

What’s in Your Cuppa?

Buddhist monks realized long ago that tea keeps them awake and today, thanks to science, we are able to explain how the active ingredients of the plant affect us.

“Contrary to many people’s beliefs, all types of tea are produced from the same plant, namely the leaves and buds of the Camellia Sinensis plant. While there are several varieties of the plant, the types of tea that we are familiar with – white, green, oolong and black – differ according to the part of the plant from which they are produced and the way they’re processed. Green tea, for example, contains less caffeine than black tea. The leaves used to produce green tea undergo a minimal drying process while the leaves intended for black tea undergo drying and fermentation,” explains Guy Shalmon, a sports nutritionist and exercise physiologist at the Sylvan Adams Sports Institute.

“Tea leaves contain substances known as flavonoids. Their composition, however, varies from one tea to another. For example, green tea has a higher concentration of a substance called epigallocatechin 3-gallate, known for short as ‘EGCG’, than black tea which undergoes a prolonged processing process. It has antioxidant activity and is attributed various health effects,” says Guy.

“Having said that, tea may reduce the absorption of iron-derived iron minerals. The polyphenols (compounds with antioxidant properties), which exist in tea leaves, may bind inorganic iron mineral before it is excreted in the feces. In order to prevent this, one does not need to give up drinking tea, but instead make sure not to drink it while consuming iron-rich plant foods,” he advises.

Will Tea Survive the Climate Crisis?

The climate crisis brings with it many changes and different regions of the world are experiencing major climate fluctuations, ranging from heat and droughts to floods, storms and extreme cold. This could threaten the continued survival of agricultural crops. Some plants have crossed oceans and been absorbed by other continents, but what about those that require special conditions to thrive? Will the tea plant survive the changing conditions?

“A plant can adapt to new conditions up to a certain limit,” says Prof. Shaul Yalovsky of the School of Plant Sciences and Food Security at The George S. Wise Faculty of Life Sciences, who studies plant development mechanisms and their response to environmental stresses. His lab has succeeded in developing tomato varieties that consume less water and still deliver the same amounts of fruit while maintaining its quality.

“Tea is a crop that grows in very rainy areas. Therefore, it is not cultivated in an area like Israel, for example. Tea plantations are usually located on hills, where the weather is humid and cool to the appropriate extent and the soil is deep enough.”

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The tea fields stretching over hills and mountains. Tea harvest in action

Disguised as Tea

Did you know that red “tea” (also known as “red bush tea”) is actually an infusion from the Rooibos plant that grows in South Africa? Because it is processed in the same way as the tea plant, it is commonly referred to as “red tea”, while in reality it is not a tea, but an herbal infusion. It is naturally caffeine-free.

Just like many other plants, tea requires specific conditions to grow: deep and airy soil rich in minerals, and an optimal temperature range between 18 and 20 degrees Celsius. “Tea is sensitive to cold, dryness, humidity and lighting conditions. For example, high humidity impairs the quality of the tea while periods of dryness increase its quality, and growing at high altitudes increases the quality of the tea but lowers the amount of crop,” explains Prof. Yalovsky.

The tea is grown in Asia, Africa and South America. The six largest tea producers in the world are China, India, Kenya, Sri Lanka, Vietnam and Turkey. So what happens if growing conditions in East and Southeast Asia change? Prof. Yalovsky explains that it is necessary to adapt the types of tea plants according to their growing areas. “What works at one location does not necessarily work elsewhere: what grows well in East and Southeast Asia will not necessarily grow well in Kenya or Turkey, for example. Even if we should manage to copy a crop from one place to another, we may not succeed in maintaining its qualities and taste.”

When we drink Earl Grey tea we expect a very specific taste, and if the same tree were to be grown elsewhere – where the temperature may be the same as the original habitat but the soil is not – we would likely notice a change in the taste of the product. This is possibly one of the reasons why drinking Japanese green tea differs in taste from Chinese green tea.

With regard to the future of the in-demand beverage, Prof. Yalovsky says: “Even if the regions of the cultivated areas should experience floods – the tea plantations are positioned on the slopes of hills and mountains so it should not become an issue.” Another good news is that unlike many crops that depend on pollination to develop fruit – the tea plant is less reliant on this. “In the production of tea, we use its leaves and not its flowers or fruits and so it can be propagated by pruning (cutting a branch from a mature plant, a so-called ‘mother plant’, and creating a new plant through rooting). This method also ensures the genetic uniformity of the ‘daughter plants’, with everything that implies,” he concludes.

We made sure to ask Guy Shalmon which type of tea (if any) he recommends that our students drink during the exam period, to which he replied: “Actually, I wouldn’t say there’s any unique advantage or need to drink tea during an exam period. I’d say drink the kind of tea that you fancy and, ideally, try to rotate different types of tea. If the need for caffeine is the main consideration, black tea is the best choice, as it has the highest caffeine concentration. Black tea contains approx. 60-40 mg of caffeine per cup, while green tea contains only 20-15 mg.”

Well, who needs the exams as an excuse, anyway? If you’re like us, we suggest you pour yourself a cuppa on any day of the week – no special occasion required – and enjoy a peaceful break from everything and everyone.

How Can We Boost Our Fight Against Marine Plastic Pollution?

Written by AUFTAU on . Posted in Newsroom.

TAU researchers say global standardization must be established.

Plastic wastes endanger marine life in many ways: animals get entangled in large plastic items or swallow small particles and chemicals, consequently dying of suffocation, starvation or poisoning. Awareness is growing, and research is expanding, but the effort to monitor and prevent plastic pollution encounters many obstacles, first of all due to the enormous complexity and diversity of plastic debris.

A new review from Tel Aviv University has determined that global standardization of methodologies for monitoring and measuring marine plastic pollution can significantly boost international efforts to mitigate this troubling phenomenon. In a comprehensive survey of all methods described in existing literature, the researchers charted the great complexity and diversity of marine plastic pollution, which makes unified measurement and accurate evaluation very difficult. According to the researchers, this is precisely why a standardized system is urgently needed, enabling comparisons, exchange of information, and effective tools for decisionmakers.

Grave and Immediate Threat

The study was led by Gal Vered and Prof. Noa Shenkar of the School of Zoology at The George S. Wise Faculty of Life Sciences and The Steinhardt Museum of Natural History at Tel Aviv University. Gal Vered is also a researcher at the Interuniversity Institute for Marine Sciences in Eilat. The review was published in Current Opinion in Toxicology.

According to Prof. Shenkar, plastic pollution, which is all human-made, poses a grave and immediate threat to the marine environment, with constantly rising amounts of plastic entering the oceans. Thus, for example, a 2013 survey conducted by Israel’s Ministry of Environmental Protection found that plastic accounts for about 41% of the volume of waste produced annually by Israelis. The Covid-19 pandemic, which has generated extreme demands for personal protective and single-use products, has further exacerbated the problem.

Comes in Different Shapes and Forms

The researchers explain that marine plastic pollution comprises many different types of plastic and plastic products of various shapes and sizes – from huge ghost nets to nanoparticles, as well as a vast range of chemical additives. Different methods for monitoring, sampling, and identifying plastic pollution relate to different properties of the sampled material: from size, source, and original use, through shape and color, to chemical composition and physical properties. Sampling is usually conducted with a towed net, with the size of collected pollutants dependent on the net’s mesh size, and tiny particles are identified in the lab using various spectroscopic and chemical methods. In addition to the diversity in sampling and identification methods, units used for reporting measured concentrations of pollutants also vary: from the number of plastic objects per area, to the weight of particles per organism, and more.

“These differences generate confusion and lack of communication among researchers in different parts of the world, hampering our efforts to work together toward our common goal: providing decision makers with reliable data in order to promote the efforts to reduce plastic pollution and its many hazards,” explains Prof. Shenkar. “We are in urgent need of standardized methods and comparable measures for monitoring, sampling, identifying, classifying, and quantifying marine plastic pollution and its impact.”

International Collaboration Needed

“This study is a response to problems encountered in my research, which deals with the impact of plastic and its chemical additives on marine life in the Eilat coral reef (presenting Israel’s largest marine biodiversity),” says Gal Vered and explains: “The differences in methodology make it difficult to use the findings of other researchers – as either a source of information or for comparing results. Thus, for example, most measurements worldwide relate to samples obtained with a towed net from the surface of the water, while I wish to discover which materials reach the seafloor and reef organisms.”

“Standardization will enable accurate evaluations and valid comparisons between plastic pollutions in different places on the globe. This will maximize the power of scientific research, enhance our understanding of the impact of plastic pollution on ecosystems and marine life, and help us develop effective tools for decisionmakers facing this crucial issue.”

Prof. Shenkar concludes: “Marine plastic pollution is a global problem, which requires extensive international collaboration. At the bottom line, we all wish to focus our efforts and obtain the best results. Like many others, we believe that efforts should begin close to the shoreline, in areas directly impacted by plastic pollution. However, a great deal of research is still required in order to establish this assumption and build effective strategies for managing plastic pollution. But first of all, we urgently need standardization that will enable all of us, all over the world, to work together.”

Featured image: Prof. Noa Shenkar 

Learning from The Fastest Growing Alga in The World

Written by AUFTAU on . Posted in Newsroom.

In scientific first, researchers successfully map photosynthetic properties of the Chlorella ohadii.

Sustainable food are grown, produced, distributed and consumed whilst keeping the environment in mind, and thus believed to help combat climate change. In a recent study, researchers set out to reveal the secret behind the rapid growth of “the fastest growing plant cell in the world,” the green alga Chlorella ohadii. Why? A better understanding of Chlorella ohadii, they assessed, might possibly help improve the efficiency of photosynthesis in other plants as well, and in turn help develop new engineering tools that could provide a solution for sustainable food. 

Can We Boost the Photosynthesis in Plants?

The study’s findings indicate that the main factors behind the plant’s rapid photosynthesis rate lie in its efficient metabolic processes. The researchers found that this alga has a unique ability to elicit a chemical reaction in which it is able to efficiently and quickly recycle one of the components used by an enzyme called RuBisCO, in a manner that significantly speeds up the photosynthetic processes.

The study was led by researchers from the Max-Planck Institute for Molecular Plant Physiology in Germany, Participating in the study was Dr. Haim Treves, a member of the School of Plant Sciences and Food Security at Tel Aviv University, together with colleagues at the Max-Planck Institute for Molecular Plant Physiology in Germany. The study was published in the prestigious journal Nature Plants.

In the framework of the study, the researchers sought to examine whether it is possible to improve the efficiency of photosynthesis in plants, an energetic process that has been occurring in nature for about 3.5 billion years. To try to answer this question, the researchers decided to focus on green algae, particularly the Chlorella ohadii variety. This alga is known for its ability to survive in extreme conditions of heat and cold, which forces it to exhibit resilience and grow very quickly.

The researchers assessed that a better understanding of Chlorella ohadii (named after the late botanist Prof. Itzhak Ohad) would make it possible to improve the efficiency of photosynthesis in other plants as well, and in turn to develop new engineering tools that could provide a solution for sustainable food.

Online Monitoring of Photosynthesis

In the process of photosynthesis, plants and algae convert water, light and carbon dioxide into the sugar and oxygen essential for their functioning. The researchers used innovative microfluidic methods based on complex physical, chemical and biotechnological principles in order to provide the algae with carbon dioxide in a measured and controlled manner and monitor the photosynthesis “online.”

By using a comparative analysis, the researchers identified that there was a fundamental difference in the photosynthetic processes carried out in in green algae compared to the model plants. They assess that the difference lies in variations in the metabolic networks, a deeper understanding of which will help in developing innovative engineering solutions in the field of plant metabolism, as well as the optimal engineering of future agricultural products.

“Past empirical studies have shown that photosynthetic efficiency is higher in microalgae than in C3 or C4 crops, both types of plants that have transport systems but which are completely different in terms of their anatomy and the way they carry out photosynthesis,” Dr. Treves explains. “The problem is that the scientific community does not yet know how to explain these differences accurately enough.”

Dr. Treves adds, “In our current study we mapped the patterns of energy production and photosynthetic metabolism in green algae and compared them to existing and new data collected from model plants. We were able to clearly identify the factors that influence the difference in these patterns. Our research reinforces previous assessments that the metabolic pathway responsible for recycling is one of the major bottlenecks in photosynthesis in plants. The next step, is to export the genes involved in this pathway and in other pathways in which we have detected differences from algae, and to test whether their insertion into other plants via metabolic engineering will increase their rate of growth or photosynthetic efficiency.

“The toolbox we have assembled will enable us to harness the conclusions from the study to accelerate future developments in engineering in the field of algae-based sustainable food as a genetic reservoir for plant improvement; monitoring the photosynthesis is a quantitative and high-resolution process, and algae offer an infinite source of possibilities for improving photosynthetic efficiency.”

Featured image: Dr. Haim Treves

Climate Action: From Campus to Glasgow

Written by AUFTAU on . Posted in Newsroom.

TAU researchers report on global summit.

As more than 130 heads of state and thousands of delegates converged in Glasgow for the two week-long United Nations global climate summit known as COP26 and Tel Aviv University researchers were there as well, taking part in the international conversation.

This year’s summit aimed to set new targets for cutting emissions from burning coal, oil and gas that are heating our planet, as scientists urge nations to make an immediate switch away from fossil fuels to avoid the most catastrophic impacts of climate change. TAU has placed climate change research and action among its top priorities and has launched the Center for Climate Change Action to drive innovative solutions to the climate crisis.

Inside the Climate Summit

TAU researchers attended the summit, exchanging knowledge and gathering observations to apply on campus and throughout Israel. They shared with us their perspectives on what comes next to ensure a cleaner, healthier and safer world for the future:

Prof. Colin Price, Head of the Center for Climate Change Action and the Department of Environmental Studies at TAU, attended COP26 as a member of Israel’s 120-person delegation. “Academia has a role in advising the government and addressing uncertainty,” said Price, who debriefed Israel’s Prime Minister Naftali Bennett on local and global climate matters in the weeks preceding COP26. “It is the role of scholars to provide neutral views based on science that policy-makers can use to swiftly guide decisions. Otherwise, they could be misinformed by people with less expertise.”

 

Israel’s Prime Minister Naftali Bennett addresses the plenary at COP26. (Photo: Colin Price)

Price added that the national security risks posed by climate change, as discussed at COP26, are an imminent concern for Israel and that academia can help address this challenge by providing objective data and analysis. “Climate-spurred humanitarian issues in neighboring countries are perhaps one of the biggest external threats to Israel,” he stressed. He mentioned droughts in Syria that led to mass migration, civil unrest and resource drainage during the country’s ongoing civil war, noting similar cases could cause further instability in the Middle East. For example, rising sea levels could expel millions along Egypt’s Nile River, leading to an overwhelming refugee crisis at Israel’s door.

He said the topics of discussion covered at COP26 were in line with the Center for Climate Change Action’s four main foci this year: regional cooperation on finding solutions, the financial sector’s role in addressing climate change, public behaviors that influence our environment, and the public health risks of the growing crisis. Price pointed toward a reported UAE-backed deal between Israel and Jordan for a solar energy and water exchange as a current example of how these forces are taking shape on the ground.

“COP26 was the beginning of the hard work ahead of us all,” he concluded.

 

Prof. Colin Price (right) and PhD student Tsur Mishal at the climate conference in Glasgow.  

Meital Peleg Mizrachi, a PhD student at TAU’s Department of Public Policy and social entrepreneur turned government advisor, attended COP26 on behalf of Israeli grassroots climate organizations “Change Direction” and “Life and Environment.” Locally recognized as a promising young leader in the field, her activism and research focus on sustainable fashion and environmental justice. She aims to raise awareness of the environmental and social ramifications of the fashion industry—the second-most polluting industry on the planet after oil—and to drive policies for greater ecological integrity in textile production and consumption.

“The unique encounter at COP26 of politicians, environmental activists, green entrepreneurs, researchers and so many different parties involved in global climate efforts allowed for new connections that otherwise would not have happened,” she reflected after the summit. “For the first time, I met with other sustainable fashion researchers from around the world. This was particularly beneficial as the field is rarely studied in Israel, and it is difficult to develop a professional network without such opportunities.”

 

TAU PhD student Metial Peleg Mizrahi at the climate conference. (Photo: Courtesy)

Tsur Mishal, a PhD candidate at the Department of Environmental Studies, was also at the convening in Glasgow. As part of a team from TAU’s Sagol Center for Neuroscience and the Porter School of the Environment and Earth Sciences, Mishal’s research contributes to virtual reality (VR) technology for climate change awareness.

“Meeting with climate media experts and leading scientists at the conference, I was happy to see interest in our VR model, which simulates the future climate in Tel Aviv,” he mused. “VR experiences can bring us closer to the lives of the people affected by the climate crisis today to create solidarity and empathy.” He explained that the technology further aims to bridge the psychological gaps people face in understanding the gap between the climate scenario today and its implications on the future, before it’s too late to reverse damages.

 

TAU PhD candidate Tsur Mishal tests virtual reality technology at COP26

During a special live broadcast on COP26 hosted from campus, Dr. Ram Fishman, a leading researcher on sustainable development in the Department of Public Policy underlined that, “Israeli climate innovation is key to these climate efforts, many of which are borne from ideas stemming from academia.” 

Hitting Rock Bottom?

Written by AUFTAU on . Posted in Newsroom.

First meta-analysis of its kind shows warming of Mediterranean Sea causes marine species to migrate.

As has been heavily discussed at the recent the UN Climate Change Conference (COP26) in Glasgow, our entire planet has been warming in recent decades. This process has been particularly marked in the Mediterranean Sea, where the average water temperature rises by one degree every thirty years, and the rate is only accelerating. One of the urgent questions that must be asked is how, if at all, the various species living in the Mediterranean will adapt to this sudden warming.

In recent years, evidence has accumulated that some species have deepened their habitats in order to adapt to global warming, while other studies have found that species are limited in their ability to deepen into cooler water. A new TAU study shows that there are species of marine animals such as fish, crustaceans and mollusks (for example squid) that change their habitats and deepen an average of 55 meters across the climatic gradient of the Mediterranean (spanning a range of 60 C) to live in cooler waters.

The Mediterranean – An Ideal Test Case

“It should be remembered that the Mediterranean was hot in the first place, and now we are reaching the limit of many species’ capacity,” explains Prof. Jonathan Belmaker from the School of Zoology in The George S. Wise Faculty of Life Sciences. “Moreover, the temperature range in the Mediterranean is extreme – cold in the northwest and very hot in the southeast. Both of these factors make the Mediterranean an ideal test case for species’ adaptation to global warming.”

The groundbreaking study was led by PhD student Shahar Chaikin under the supervision of Prof. Jonathan Belmaker, and along with researchers Shahar Dubiner, all from the School of Zoology in The George S. Wise Faculty of Life Sciences and The Steinhardt Museum of Natural History at Tel Aviv University. The results of the study were published in the journal Global Ecology and Biogeography, and have far-reaching implications for both fishing and future marine nature reserves.

Life at the Bottom

Cause for Preparation

The results of the study have many implications for the future, in the Mediterranean and in general, given that the response of each species to rising temperatures can be predicted according to its traits, such as temperature preference. This, for the first time, offers researchers the opportunity to forecast changes in the composition of the marine community, as well as for the public the opportunity to prepare for these changes accordingly.

“Our research clearly shows that species do respond to climate change by changing their depth distribution,” Chaikin concludes, “and when we think about the future, decision-makers will have to prepare in advance for the deepening of species. For example, future marine nature reserves will need to be defined so that they can also provide shelter to species that have migrated to greater depths. And on the other hand, fishing in the future will involve fishing the same fish at greater depths, which means sailing further into the sea and burning more fuel.”

So, How Deep is Our Love?

In the framework of the study, the Tel Aviv University researchers conducted a meta-analysis of data on the depth distribution of 236 marine species collected in previous bottom-trawl surveys. The data collected revealed for the first time that species deepen their minimum depth limits in parallel with warming seawater temperatures, from the west to the east Mediterranean, and on average deepen 55 meters across the Mediterranean (a range of 60 C).

However, the pattern of deepening is not uniform between species: cold-water species were found to deepen significantly more than warm-water species, species that live along a narrow depth range deepen less than species that live along a wide depth gradient, and species that can function within in a wider temperature range deepen more than those who can function only within a narrow temperature range.

“Various studies collect fishing data from trawling – that is, a boat that drags a net along the seabed and collects various species – and these studies often also measure the depth at which the species were caught in the net,” says Shahar Chaikin. “We cross-referenced these data with water temperature data, and by analyzing 236 different species we came to a broad and compelling conclusion: there has been a deepening of the depth limits of species’ habitats. The minimum depths for species in the Mediterranean are getting deeper, while the maximum depths remain stable. The deepening effect was found to be more significant among cold-water species. In contrast, there are species that function within a narrow temperature range and at a certain depth that deepen much less, probably because they cannot survive in deeper water.”

 

“Even if species deepen to escape the warm waters and this rapid adaptation helps them, there is still a limit – and that limit is the seabed,” adds Prof. Belmaker. “We are already seeing deep-sea fish like cod whose numbers are declining, probably because they had nowhere deeper to go.”

TAU Initiates Model for Carbon Neutrality

Written by AUFTAU on . Posted in Newsroom.

Climate change efforts among University’s top priorities.

Against the backdrop of the UN Climate Change Conference (COP26) in Glasgow, and following a comprehensive series of tests, TAU prepares to formulate a strategic plan for significantly reducing greenhouse gas emissions generated by its activities and promoting more efficient use of resources and renewable energy. The university places great importance on reducing its environmental footprint by using sustainable energy, recycling water and materials, reducing use of paper, introducing green purchasing procedures and other activities designed to reduce the campus’ carbon footprint, and eventually attain carbon neutrality.

Inspecting Footprints

To this end, a team of academic and administrative experts appointed by TAU’s Green Campus Committee headed by TAU President Prof. Ariel Porat, launched a comprehensive inspection to assess the overall carbon footprint (in terms of CO2 equivalent) and water footprint of all TAU activities both on and off campus. The analysis, which began approximately a year ago, included assessment of the following:

  • energy consumption from various sources on campus
  • water consumption
  • transportation to and on campus
  • construction inputs
  • pruning and gardening
  • waste production and food consumption
  • serving utensils and packaging at cafes and kiosks on campus, and more

The team will soon complete their mission and submit their findings to the Green Campus Committee and TAU’s senior management. Based on their report, TAU will formulate a strategic plan for reducing greenhouse gas emissions on campus and reaching carbon neutrality.

“It Can Be Done, And We Will Do It”

TAU President Prof. Ariel Porat: “As a leading academic research and teaching institution in the fields of ecology and environmental science, committed to addressing the climate crisis, TAU established an ‘initiative for carbon neutrality’ about a year ago – the first of its kind at an Israeli university. Currently we are completing the initial inspection, and its findings will serve as a foundation for a strategic plan that will significantly reduce the campus’ carbon footprint, and eventually bring us as close as possible to carbon neutrality. As a leading public university, it is our duty to lead the efforts for addressing the climate crisis on and beyond our campus. We hope that other institutions will join us. Time is running out and we must act immediately.”

“It is our duty to lead the efforts for addressing the climate crisis on and beyond our campus,” says TAU President Prof. Ariel Porat.

Prof. Marcelo Sternberg of the School of Plant Sciences and Food Security at The George S. Wise Faculty of Life Sciences, co-leader of TAU’s carbon neutrality initiative, added: “I am proud to be part of the team leading an historical move toward reducing TAU’s carbon footprint and turning it into a sustainable institution. The current climate crisis leaves no room for inaction. As a teaching and research institution, we can show the government and society the way to reducing the environmental footprint and ensuring a better world for future generations. It can be done, and we will do it.

Lior Hazan, Chair of TAU’s Student Union, added: “The climate crisis is spreading and intensifying, causing great concern. It is no longer something occurring far away, it is happening right here and now. We, the young people, have the power to change and work for a better future, in face of the gravest crisis of the 21st century, and academia is an excellent place to begin. Students must become leading ambassadors of this cause, since they are the future of society, industry, and leadership, and to this end, we must change and introduce change for the benefit of our planet. The Student Union takes an active part in TAU’s plan to attain carbon neutrality and continues to work for the rapid reduction of environmental damage.”

Ofer Lugassi, Vice President for Construction & Maintenance at TAU emphasized that the mapping of the university’s carbon and water footprints was carried out by a specialized external company, which made a great effort to include all activities on campus. 

Featured image: Students enjoying a moment on the increasingly greener TAU campus (Photo: Rafael Ben-Menashe)

Fighting Pollution With Seaweed

Written by AUFTAU on . Posted in Newsroom.

Coastal seaweed farms can help fight environmental damage.

Nitrogen is a common fertilizer for agriculture, but it comes with an environmental and financial price tag. Once nitrogen reaches the ocean, it disperses randomly, damaging various ecosystems. As a result, the state local authorities spend a great deal of money on reducing nitrogen concentrations in water, including in the Mediterranean Sea.

A new study by Tel Aviv University and University of California, Berkeley suggests that establishing seaweed farms in areas where freshwater rivers or streams meet the oceans, or so-called “river estuaries”, significantly reduces nitrogen concentrations and prevents pollution in marine environments.

As part of the study, the researchers built a large seaweed farm model for growing the ulva sp. green macroalgae in the Alexander River estuary, hundreds of meters from the open sea. The Alexander River was chosen because the river discharges polluting nitrogen from nearby upstream fields and towns into the Mediterranean Sea. Data for the model were collected over two years from controlled cultivation studies.

The study was headed by doctoral student Meiron Zollmann, under the joint supervision of Prof. Alexander Golberg of the Porter School of Environmental and Earth Sciences and Prof. Alexander Liberzon of the School of Mechanical Engineering at The Iby and Aladar Fleischman Faculty of Engineering, Tel Aviv University, and was conducted in collaboration with Prof. Boris Rubinsky of the Faculty of Mechanical Engineering at UC Berkeley. It was published in the prestigious journal Communications Biology.

“My laboratory researches basic processes and develops technologies for aquaculture,” explains Prof. Golberg. “We are developing technologies for growing seaweed in the ocean in order to offset carbon and extract various substances, such as proteins and starches, to offer a marine alternative to terrestrial agricultural production. In this study, we showed that if seaweed is grown according to the model we developed, in rivers’ estuaries, they can absorb the nitrogen to conform to environmental standards and prevent its dispersal in water and thus neutralize environmental pollution. This way, we actually produce a kind of ‘natural decontamination facility’ with significant ecological and economic value, as seaweed can be sold as biomass for human use.”

Profitable and Environmentally Friendly

“Our model allows marine farmers, as well as government and environmental bodies, to know in advance what the impact will be and what the products of a large seaweed farm will be – before setting up the actual farm,” adds Meiron Zollmann. “Thanks to mathematics, we know how to make the adjustments also concerning large agricultural farms and maximize environmental benefits, including producing the agriculturally desired protein quantities.”

“The whole world is moving towards green energy, and seaweed can be a significant source,” adds Prof. Liberzon, “and yet today, there is no single farm with the proven technological and scientific capability. The barriers are also scientific: We do not really know what the impact of a huge farm will be on the marine environment. It is like transitioning from a vegetable garden outside the house to endless fields of industrial farming. Our model provides some of the answers, hoping to convince decision-makers that such farms will be profitable and environmentally friendly. Furthermore, one can imagine even more far-reaching scenarios. For example, green energy: If we knew how to utilize the growth rates for energy in better percentages, it would be possible to embark on a one-year cruise with a kilogram of seaweed, with no additional fuel beyond the production of biomass in a marine environment.”

“The interesting connection we offer here is growing seaweed at the expense of nitrogen treatment,” concludes Prof. Golberg. “In fact, we have developed a planning tool for setting up seaweed farms in estuaries to address the environmental issue while producing economic benefit. We offer the design of seaweed farms in river estuaries containing large quantities of agriculturally related nitrogen residues to rehabilitate the estuary and prevent nitrogen from reaching the ocean while growing the seaweed itself for food. In this way, aquaculture complements terrestrial agriculture.”

Featured image: The cultivation reactor that was used as the base of the model

Diminishing at the Edges

Written by AUFTAU on . Posted in Newsroom, Press release.

TAU study reveals: overfishing severely harms marine protected areas around the world

A new study by Tel Aviv University reveals significant ecological damage to many marine protected areas (MPAs) around the world. A strong “edge effect” was observed, resulting in a 60% reduction in the fish population living on their outer edges (1-1.5 km), compared to the core areas. The “edge effect” significantly diminishes the effective size of those areas, and largely stems from human pressures, first and foremost overfishing at their borders.

Marine protected areas were designed to preserve marine ecosystems, and help to conserve and restore fish populations and marine invertebrates whose numbers are increasingly dwindling due to overfishing. The effectiveness of the protected areas has been proven in thousands of studies conducted worldwide. At the same time, most studies sample only their “inside” and “outside”, and there still is a knowledge gap about what happens in the space between their core and areas around them that are open for fishing.

The study was conducted by Sarah Ohayon, a doctoral student at the laboratory of Prof. Yoni Belmaker, School of Zoology, The George S. Wise Faculty of Life Sciences, and The Steinhardt Museum of Natural History at Tel Aviv University. The study was recently published in the Nature Ecology & Evolution Journal.

 

The “Edge Effect”

When a protected area functions properly, the expectation is that the recovery of the marine populations within it will result in a spillover, a process where fish and marine invertebrates migrate outside its borders. In this way, the protected area can contribute not only to the conservation of marine nature, but also to the renewal of fish populations surrounding it that have dwindled due to overfishing.

To identify the dominant spatial pattern of marine populations from within the protected areas to the surrounding areas (that are open for fishing), the researchers analyzed marine populations from dozens of protected areas located in different parts of the oceans. 

“When I saw the results, I immediately understood that we are looking at a pattern of edge effect”, says Ohayon. “The edge effect is a well-studied phenomenon in terrestrial protected areas, but surprisingly it has not yet been studied empirically in MPAs. “This phenomenon occurs when there are human disturbances and pressures around the protected area, such as hunting/fishing, noise or light pollution that reduce the size of natural populations within the protected areas, close to their borders”.

 

No-Take Marine Protected Areas Are Too Small

The researchers found that 40% of the no-take MPAs (areas where fishing activity is completed prohibited) around the world are less than 1 km2, which means that entire area is likely to experience an edge effect. In total, 64% of all no-take MPAs in the world are smaller than 10 km2 and may hold only about half (45-56%) of the expected population size in their area compared to a situation without an edge effect. These findings indicate that the global effectiveness of existing no-take areas is far less than previously thought.

It should be emphasized that the edge effect pattern does not eliminate the possibility of fish spillover, and it is quite plausible that fishers still enjoy large fish coming from within the protected areas. This is evidenced by the concentration of fishing activity at their borders. At the same time, the edge effect makes it clear to us that marine populations near the borders of the protected areas are declining at a faster rate than the recovery of the populations surrounding them.

 

Buffer, Enlarge and Enforce

The study findings also show that in protected areas with buffer zones around them, no edge effect patterns were recorded, but rather a pattern consistent with fish spillover outside their borders. Additionally, a smaller edge effect was observed in well-enforced protected areas than in those where illegal fishing was reported.

“These findings are encouraging, as they signify that by putting buffer zones in place, managing fishing activity around marine protected areas and improving enforcement, we can increase the effectiveness of the existing protected areas and most probably also increase the benefits they can provide through fish spillover”, adds Ohayon.

“When planning new marine protected areas, apart from the implementation of regulated buffer zones, we recommend that the no-take MPAs targeted for protection be at least 10 km2 and that their shape be as round as possible. These measures will reduce the edge effect. Our research findings provide practical guidelines for improving the planning and management of marine protected areas, so that we can do a better job of protecting our oceans.” 

Featured image: Photo credit Dr. Shevy Rothman

This Exhibition Will Make You Sweat

Written by AUFTAU on . Posted in Magazine, Newsroom.

New exhibition on climate crisis gives us tools to save the planet.

Recent news has covered extreme events all over the world: floods in Germany, Belgium and central China, huge wildfires raging in California, consuming thousands of acres of land and extreme temperatures in Canada, Iraq and the United States. Scientists no longer doubt that all this and more is taking place due to global warming, and what is commonly referred to as the “climate crisis”

Seeking to educate the Israeli public on the science behind the concepts that we keep hearing, such as the greenhouse effect, global warming and carbon footprint, the Steinhardt Museum of Natural History has set up the exhibition “Global Warning: The Climate, the Crisis and Us”, which encourages the public to learn more about the subject and become ambassadors who will lead the long-awaited change. We checked, and can share with you that it is impossible to remain indifferent after visiting the exhibition.

How Many Trees Are Working Just for You?

The exhibition, which the museum has been working on for over a year, guides the visitors to the sea, land, glaciers and forests, in the past, present and future. It presents current scientific findings and basic concepts in the field in simple terms and through interactive means, such as videos, thermal cameras that expose thermal gases that surround us, and more.

It uncovers the dire consequences of the climate crisis here in Israel and worldwide, and illustrates the impact of our daily choices as individuals. Everything is not lost; the exhibition illuminates how we can counteract the changes that are causing the crisis and reduce the harm caused to us and the environment.

The various stations of the exhibition show how popular tourist spots may look like in 20 years from now, what the atmospheric composition was thousands of years ago, and what it may be in a few decades from now. The connection between allergies and global warming is explained, as well as what it will be like when sea level reaches our shoulders. You can even check what your personal carbon footprint is, by the help of an online calculator which was developed especially for the exhibition and is the first of its kind in Israel.

 

What do greenhouse gases look like? Judi Lax explains big concepts in simple language.

Fostering Change Agents

The new exhibition does not, however, intend to scare us into passivity: “We wish to increase the awareness surrounding our daily choices, such as what to eat, how to travel, what to buy and what not to buy. These things have implications and a price beyond the cost of the purchase itself. Oftentimes, people hear about the climate crisis and say, “Ok, but how does this relate to me?” We wish to impart that, although a lot [of damage] has accumulated, it is not all lost. We also have a hand in the matter, and can undo some of the damage,” explains Hadas Zemer Ben-Ari, the exhibition’s curator and designer. “Along with the experience of visiting the exhibition, we strive to make our visitors agents of change, who will spread the message outside the walls of the museum and inspire many others to work for the change that we so desperately need,” says Prof. Tamar Dayan, Museum Chair at the Steinhardt Museum of Nature.

The Museum joins some of the worlds’ largest museums in the common mission to carry out their social role in educating the wider audience on the topic of the climate crisis and the discussion of the biodiversity crisis and its impacts. Museum Director Alon Sapan explains that museums are capable of illustrating and simulating a complex reality and the processes that led to it, along with predictions for the future, while ensuring the visitors’ experience and encouraging their curiosity. “I hope that the exhibition will inspire questions, and also enlighten individuals on how they contribute to positive change by adjusting their personal habits,” concludes Sapan.

 

An invitation to change a habit (or three!) at the “Global Warning” exhibition.

Featured image: The exhibition “Global Warning: The Climate, the Crisis and Us” (Photo: Dor Kimchi)

Read more and purchase tickets here >> 

Victoria

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