Wednesday, July 03, 2024

 

New study on children and food:  Fruit chunks in yogurt are a turn off for one age group in particular



It’s no secret that kids aren’t crazy about having too many seeds, pulp or chunks in their food. But six-year-olds in particular definitely can’t stand lumps, according to a new study from the University of Copenhagen published today. 



Peer-Reviewed Publication

UNIVERSITY OF COPENHAGEN - FACULTY OF SCIENCE




If you feel like your six-year-old has suddenly gotten extra fussy about the texture of their dinner, don't worry. It will pass. A new study from the University of Copenhagen’s Department of Food Science demonstrates that at the age of six, children prefer to avoid crunch in their peanut butter, berries in jam and pieces of fruit in yogurt,  

In the study, the researchers asked 485 children between the ages of five and twelve to choose between six different foods with and without lumps, seeds and pieces of fruit in them. The foods were bread, orange juice, peanut butter, strawberry jam, yogurt and tomato soup. The researchers showed children drawings of these foods both with and without lumps, and then asked them to choose between them.

In 76 percent of the instances, six-year-olds opted for foods without lumps, the highest preference rate observed across the age groups.

"The fact that children in general are not happy with too many lumps in food is probably something many people can recognize, but this is the first time that a scientific study has linked a specific age group, namely six-year-olds, so clearly to this food preference," says Dr. Ching Yue Chow, first author of the study. 

To get answers that were as precise as possible, the researchers have used real foods to test how consistent children were in answering these questions in other studies.

Protection against dangerous foods

According to Ching Yue Chow, there may be an explanation for why children's fear of complex texture in food peaks around the age of six.

"Food neophobia is often described as the reluctance to eat new or unfamiliar foods. It is thought to be a protective function to prevent children from eating potentially poisonous foods or other dangerous things when they start to become more independent. Studies have reported that food neophobia starts from a low baseline at weaning. It increases sharply as a child becomes more mobile and independent, reaching a peak at around 6 or 7 years old.

As such, it makes sense that this particular group in our study does not like too many lumps in food, as it is at this age that they are most cautious when it comes to food," explains Ching Yue Chow.         

The researchers also examined whether chunk size in food has anything to say. But here, they found no unequivocal answer.

"It seemed that the children generally had no problem in distinguishing different sizes of chunks when foods were in their mouths. For them, it's mostly about the presence or absence of chunks," says Ching Yue Chow. 

However, despite there being a low point in the desire to eat food with chunks at the age of six, it gradually goes the other way in 7-12-year-olds, the study shows. And this is supported by our previous knowledge in advance of how children's food preferences mature with age.

"As children reach school age, they may become more influenced by classmates and others within their circle to try new types of food and have more of a desire to expand their horizons. We can also see that the proportion that would like to have food with chunks in food grows in concert with their age in the study," says Ching Yue Chow.

New dishes may need to be introduced 8-15 times

And according to the researcher, the "anti-chunk phase" that 6-year-olds have, you have to accept as a parent, although it can be frustrating when the kids don't want to eat the food they're served. But that can easily change once they're past the critical age of six. You just have to keep trying – often up to 15 times, the recommendation goes:

"A lot of research on children and foods shows that repeated exposures to new dishes have a positive effect on whether they’ll bother eating them. Specifically, it is about giving children the opportunity to taste new food while there is something on the plate that they already know. Often they need to be presented with the new dish 8-15 times before they develop preference for it, but persistence pays off," explains Ching Yue Chow.

Furthermore, it’ a good idea to avoid compulsions and rewards for children to eat their vegetables.

“Rewarding a child with an ice cream if they eat their broccoli, is a very short-term strategy. Because the moment you remove the ice cream, they don't want to eat the healthy foods. At the same time, you shouldn’t pressure a child or try to force them to eat certain things, because you risk that they will eat the new food even less than before because they associate it with something negative," says Ching Yue Chow.

The new research results shed more light on the food preferences of children between the ages of five and twelve, which the researcher hopes can make parents and the food industry wiser about our relationships with food.

"It is important to understand the underlying psychology of children when you, as a parent, serve them food and when you as a company develop new products to avoid children becoming unnecessarily picky. Here, I hope that our study can serve as an inspiration to parents and those who develop new food products," concludes Ching Yue Chow

 

The 6-year-olds like lumps in their food the least:

About the study:

  • The study is published in [link]
  • The research was carried out in a close collaboration between Future Consumer Lab, Department of Food Science, University of Copenhagen and the CASS Food Research Centre at Deakin University, Australia.
  • The researchers behind the study are: Ching Yue Chow, Anne C. Bech, Annemarie Olsen, Russell Keast, Catherine G. Russell and Wender L.P. Bredie.
  • The study involved 485 Australian children aged 5-12 years.
  • The study is funded by Innovation Fund Denmark and Arla Foods.

 

 

Flexible and durable bioelectrodes: the future of healthcare wearables


The proposed bioelectrode can lead to comfortable and long-lasting wearables for healthcare and fitness applications


Peer-Reviewed Publication

TOKYO INSTITUTE OF TECHNOLOGY

Stretchable and Humidity-Permeable Electrode Material  for Wearable Bioelectrodes 

IMAGE: 

THE PERMEABILITY AND STRETCHABILITY OF THE SWCNT-SBS NANOSHEET MAKE IT SUITABLE FOR SKIN-CONFORMABLE BIOELECTRODES.

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CREDIT: TOKYO TECH.




The use of wearable electronics that continuously monitor biosignals has transformed the healthcare and fitness industries. These devices are becoming increasingly common and are projected to reach a market valuation of approximately USD 572.06 billion by 2033. With this rapid growth, there is an escalating demand for high-quality bioelectrodes capable of accurately recording biosignals over extended periods. However, many of the materials currently used for bioelectrodes, such as metals, conductive polymers, and hydrogels, have limitations. They often lack the flexibility to stretch the skin without breaking and have low humidity permeability, leading to sweat buildup and discomfort.

To address these limitations, in a study published in the journal NPG Asia Materials on 20 June 2024, a research team led by Assistant Professor Tatsuhiro Horii and Associate Professor Toshinori Fujie from Tokyo Institute of Technology (Tokyo Tech) has developed a bioelectrode material that is stretchable and permeable to humidity and conforms closely to the skin. This innovative material is composed of layers of conductive fibrous networks consisting of single-wall carbon nanotubes (SWCNTs) on a stretchable poly(styrene-b-butadiene-b-styrene) (SBS) nanosheet. The nanosheet conforms tightly to the skin, allowing for precise biosignal measurements, while the carbon nanotube fibers maintain the material’s stretchability and humidity permeability.

“Self-supporting electrodes that are stretchable, permeable to humidity, and conformable to skin surface bumps are required to allow for the natural deformation of skin without restricting body movements,” says Horii.

The researchers applied SWCNTs as aqueous dispersions onto SBS nanosheets, creating multiple layers reaching a thickness of only 431 nm. Each coating of SWCNTs increased the density and thickness of the fibers, modifying the bioelectrode's characteristics. While adding more SWCNT layers increased nanosheet stiffness (from an initial 48.5 MPa elastic modulus to 60.8 MPa for a single layer and 104.2 MPa for five layers), the bioelectrode maintained impressive flexibility. Pristine SBS nanosheets and those with one or three layers of SWCNTs (SWCNT 3rd-SBS) stretched elastically by 380% of their original length before permanent deformation. This flexibility surpasses metal electrodes like gold, which have Young's moduli in the several-hundred-GPa range and can only stretch less than 30% of their original length before breaking.

Another crucial requirement for bioelectrodes is high water vapor permeability to prevent sweat buildup during exercise. Adding SWCNTs is beneficial as its fibrous network structure improves breathability compared to continuous films. In experiments measuring water vapor transmission rate (WVTR), researchers found that SWCNT 3rd-SBS exhibited a WVTR of 28,316 g m-2 (2 h)-1, which is twice that of normal skin. 

The bioelectrode material is also highly resilient for extended use. To test the material’s durability, the researchers immersed the bioelectrodes in artificial sweat and subjected them to repeated bending, measuring the change in resistance. In these tests, they found that the resistance increased negligibly, by only 1.1 times in sweat and by 1.3 times over 300 cycles of bending. Furthermore, the SWCNT 3rd-SBS nanosheets showed little to no detachment after being rubbed ten times, indicating its suitability for prolonged use.

To assess its real-world performance, the researchers compared an SBS nanosheet with three layers of SWCNT to commercially available bioelectrode materials such as Ag/AgCl gel electrodes. The bioelectrodes were attached to the forearm, and surface electromyography (sEMG) measurements were taken during gripping motions. In this experiment, the performance of the SWCNT-SBS nanosheet was comparable to that of commercial Ag/AgCl gel electrodes, achieving similar signal-to-noise ratios of 24.6 dB and 33.3 dB, respectively.

“We obtained skin-conformable bioelectrodes with high water vapor permeabilities, which showed comparable performance in sEMG measurements to those of conventional electrodes,” concludes Fujie, highlighting the material’s promising capabilities for healthcare wearables.

 

 

About Tokyo Institute of Technology

Tokyo Tech stands at the forefront of research and higher education as the leading university for science and technology in Japan. Tokyo Tech researchers excel in fields ranging from materials science to biology, computer science, and physics. Founded in 1881, Tokyo Tech hosts over 10,000 undergraduate and graduate students per year, who develop into scientific leaders and some of the most sought-after engineers in industry. Embodying the Japanese philosophy of “monotsukuri,” meaning “technical ingenuity and innovation,” the Tokyo Tech community strives to contribute to society through high-impact research. https://www.titech.ac.jp/english/ 

 

Unveiling East Asia's urban landscape: a massive mapping project illuminates 280 million buildings




JOURNAL OF REMOTE SENSING
The comparison results with different products in China. Images are from © Google Earth 2021. 

IMAGE: 

THE COMPARISON RESULTS WITH DIFFERENT PRODUCTS IN CHINA. IMAGES ARE FROM © GOOGLE EARTH 2021.

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CREDIT: JOURNAL OF REMOTE SENSING




A pioneering study has completed a detailed mapping of 280 million buildings in East Asia, a region grappling with urbanization challenges. This mapping, the most extensive to date, utilizes very high-resolution (VHR) imagery to create a precise and comprehensive dataset. The findings are set to transform urban planning and management, offering an unprecedented level of detail that was previously unattainable.

Accurate and comprehensive building data is critical for urban management and planning. Existing datasets, such as those from Microsoft and OpenStreetMap, often lack completeness and accuracy in East Asia, limiting their utility for large-scale applications. The complex distribution of buildings and scarcity of auxiliary data in this region further complicate the extraction of reliable building footprints. Based on these challenges, there is a need for a more detailed and accurate dataset to support urban analysis and planning. Therefore, a comprehensive mapping framework was developed to address these issues and produce a high-quality building dataset for East Asia.

Researchers from Sun Yat-sen University, in collaboration with international experts, published their findings (DOI: 10.34133/remotesensing.0138) in the Journal of Remote Sensing, on 9 May, 2024. The study details a novel framework for building extraction using very high-resolution (VHR) images, marking a significant leap in urban data acquisition.

The study addresses the limitations of existing building datasets in East Asia by introducing a comprehensive large-scale building mapping (CLSM) framework. This framework employs innovative strategies such as region-based adaptive fine-tuning, stable boundary optimization, and high model efficiency through model distillation. Using high-resolution Google Earth images, researchers extracted building footprints across five East Asian countries, resulting in a dataset of over 280 million buildings spanning 2,897 cities, with an average overall accuracy of 89.63% and an F1 score of 82.55%. The CLSM framework effectively manages the complex layouts and diverse appearances typical of East Asian urban environments. Its boundary enhancement and regularization modules improve building boundary extraction accuracy, while the model distillation technique boosts computational efficiency. The region-based adaptive fine-tuning strategy enhances the model's generalization capabilities, ensuring consistent high-quality results across various regions. Compared to existing datasets, this new dataset offers superior quality and completeness, making it invaluable for urban planning, energy management, and related research fields.

Dr. Jiajun Zhu, a lead researcher in the study, stated, "Our comprehensive mapping framework addresses the critical need for accurate and complete building data in East Asia. This dataset not only enhances urban planning and management but also supports a wide range of research applications. The high accuracy and detailed representation of building footprints offer new opportunities for urban analysis and sustainable development."

The implications of this research are far-reaching, offering support for urban analysis, energy modeling, and sustainable city planning. The dataset's availability promises to be a cornerstone for future studies and urban development strategies in one of the world's most populous and rapidly urbanizing regions.

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References

DOI

10.34133/remotesensing.0138

Original Source URL

https://spj.science.org/doi/10.34133/remotesensing.0138

Funding information

This study was supported in part by the National Key R&D Program of China under Grant 2022YFB3903402, in part by the National Natural Science Foundation of China under Grant 42222106, in part by the National Natural Science Foundation of China under Grant 61976234, and in part by the Fundamental Research Funds for the Central Universities, Sun Yat-sen University under Grant 22lgqb12.

About Journal of Remote Sensing

The Journal of Remote Sensingan online-only Open Access journal published in association with AIR-CAS, promotes the theory, science, and technology of remote sensing, as well as interdisciplinary research within earth and information science.

 

Meet the team 3D modelling France’s natural history collections



SOCIETY FOR EXPERIMENTAL BIOLOGY





France’s natural history collections contain nearly 6% of the world’s total natural specimens across multiple institutions, and the e-COL+ project aims to capture and reconstruct these specimens in 3D for easy access and 3D printing around the world.

“I’m a researcher of vertebrate locomotion and vocalisation, so I produce a lot of CT scans and 3D models – and now I’m in charge of developing the museum’s own 3D digital collection,” says Dr Pauline Provini, a lecturer at the Natural History Museum in Paris, France and collaborator on the e-COL+ project. Dr Provini is in line to become the Scientific and Technical Coordinator for the project, following the announced retirement of the current Coordinator Pierre-Yves Gagnier.

Dr Provini and her partners plan to produce several thousands of 3D models of whole animal specimens and fragmental specimens, which includes bones and partial remains. The e-COL+ project is led by France’s National Natural History Museum and includes 9 other national research institutions and universities.

The e-COL+ project has four main objectives. Firstly, to provide modern equipment, especially 3D scanning tools, to the partcipating project partners so that they can digitise their collections.

Secondly, to create a comprehensive dataset of 3D models of animals that cover a wide range of taxonomy, including both living and extinct species. “We want to have digital versions of representatives of most modern vertebrates and arthropods,” says Dr Provini. “We also want to incorporate any existing 3D models from the French collections and help to fill the gaps.”

Depending on the size and type of the specimen, Dr Provini and her team use different scanning techniques. “We use surface scanners for bones and whole skeletons, but we use CT scans for specimens that are kept in fluid,” she says. “For small specimens like insects, we use external providers like the European Synchrotron Radiation Facility.”

Thirdly, they wish to build AI tools to help improve the 3D model reconstruction process. “This can help with the automatic identification of a species or the parts of the specimen, which is a very important development for the project,” says Dr Provini.

The fourth and final objective is to organise storage, availability, and presentation of the digital models for both research and public use. “We want to build an online 3D catalogue that people can use to download the models. Not only researchers, but also more general audiences,” says Dr Provini.

A major benefit of this project is the ability to rapidly share access to specimens between research institutions and other museums around the world. “Typically, institutions can borrow specimens from other places for their own exhibitions, but it can be very complicated because there's a lot of paperwork to do – especially if they’re very rare or fragile specimens,” says Dr Provini. “Now we just send the numerical model, and they can 3D print the model whenever they want.”

The e-COL+ project also has benefits for teaching by providing access to specimens that may otherwise be restricted. “It will be important for learning anatomy and other subjects, but also useful for learning to use 3D printing technology and software," says Dr Provini.

The e-COL+ project is set to conclude in 2029. It is funded by the French government and managed by the French National Research Agency under the Programme d'Investissements d'Avenir (ANR-21-ESRE-0053).

This project is being presented at the Society for Experimental Biology Annual Conference in Prague on the 2-5th July 2024.

 

Social media is a likely cause of ‘confusion’ in modern mate selection



SOCIETY FOR EXPERIMENTAL BIOLOGY
Diagram explaining the cascading effects of social media on confusion in relationships 

IMAGE: 

DIAGRAM EXPLAINING THE CASCADING EFFECTS OF SOCIAL MEDIA ON CONFUSION IN RELATIONSHIPS.

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CREDIT: CHAYAN MUNSHI




A recent sociological study finds that most young adults surveyed reported feeling confused about their options when it comes to dating decisions. Preliminary analysis suggests that more than half of young people experience confusion about choosing life-partners, with women appearing to be more likely to report partner selection confusion than men.

Due to the pervasiveness of social media and digital dating in everyday lives, humans are now exposed to many more potential mates than ever before, but the availability of popular dating apps and ease of photo enhancement can distort the reality of the available pool of dating candidates.

“Human mate selection is a complicated psychological process, which is effectively influenced by multiple societal factors including appearance, personality and financial situation,” says Chayan Munshi, Founder and Executive Director of the Ethophilia Research Foundation in Santiniketan, India. “More recently, this has become significantly influenced by social media where constant exposure to sexually stimulating or attractive content creates certain perceptions of reality in the young mindset, which ultimately creates confusion in terms of selecting potential mating partners.”

The Ethophilia Research Foundation is a research group focused on behavioural biology research and public health, who have recently started to investigate how the digitalisation of society is regulating human behaviour. “This project started with extensive observation of human behavioural patterns regarding partner choice,” says Mr Munshi. “This observational study was followed by direct interactions with a young population using an open questionnaire.”

The preliminary results of this ongoing project come from a survey of young adults in India, with most respondents being between 18 and 30 years old. Further analysis of the results is underway, with an expanded survey in preparation to include more specific lines of inquiry.

The questionnaire included questions related to romantic partner selection, such as “Do you feel confused when selecting a life-partner?”, “What are your criteria for selecting a life-partner?”, “Do you still look for other partners if you are already in a stable relationship?” and “Do you like to switch to a ‘better option’ when selecting a life-partner?”.

These initial results show that the perception of potential mate availability may be skewing how people judge their life-partner options, even while in existing relationships. “For instance, impulsiveness is significantly exhibited, and there is a decrease in in-person social interactions,” says Mr Munshi. “This is exposing confusion while people search for a mating partner and can manifest complexities in maintaining a relationship.”

Mr Munshi expects that this ongoing research will help to build a better understanding of how mate selection is evolving in humans. “Our hypothesis strongly indicates that the ‘pleasure index’ or ‘adrenaline rush’ of relationships is taking more prime importance in the younger generation over long-term stability,” he says. “It is alarming that impulsiveness or confusion can lead to instability in the human relation-maintaining behaviour, which is actually affecting the normal social behaviour in humans.”

“The pattern now is notable enough to indicate that this might modify the social norms of partner choice behaviour in young humans, which might have significant effect on the brain-behaviour circuit,” says Mr Munshi. “In the long run, this may eventually alterthe fundamental protocol of evolutionary mating strategies.”

This research is being presented at the Society for Experimental Biology Annual Conference in Prague on the 2-5th July 2024.

 BIRD BRAINED, NOT

Blue and great tits deploy surprisingly powerful memories to find food




UNIVERSITY OF CAMBRIDGE
Blue and great tits taking part in episodic-like memory test 

VIDEO: 

BLUE AND GREAT TITS TAKING PART IN THE EPISODIC-LIKE MEMORY TEST. THE BIRDS VISIT AN AUTOMATED FOOD CONTAINER, THE DOOR RELEASES AND THEY TAKE THEIR PREFERRED FOOD: SUNFLOWER SEEDS.

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CREDIT: JAMES DAVIES




Blue and great tits recall what they have eaten in the past, where they found the food and when they found it, a new study shows. In the first experiment of its kind to involve wild animals, blue and great tits demonstrated ‘episodic-like’ memory to cope with changes in food availability when foraging.

The same study may suggest that humans leaving out seeds and nuts for garden birds could be contributing to the evolution of these memory traits.

 

Episodic memory is a memory system involving the conscious recollection of personally experienced events. Many psychologists believe that episodic memory is uniquely human but a growing body of evidence suggests that many non-human animals possess episodic-like memory.

Published today in Current Biology, the study by researchers from the University of Cambridge and the University of East Anglia enabled 94 wild, free-living blue and great tits to take part in a series of memory tasks. These tasks involved automated food containers and a new software program that created unique experiences for individual birds, and tracked each bird’s behaviour after they formed a memory.

The birds had previously been fitted with unique radio frequency tracking tags on their legs so that when they landed on the feeder’s special perch, this read their tag, and custom-built programs released (or did not release) food through an electronic door, according to experimental rules with unique timed events specific to each individual bird.

The experiment focused on blue tits and great tits partly because they are opportunistic foragers feeding on a wide range of food types, and may benefit from being able to recall ecological details from a single experience as this would permit flexible decision-making.

 “These findings provide the first evidence for episodic-like memory in the wild and show that blue and great tits have a more flexible memory system than we used to assume,” said first author James Davies, from the University of Cambridge’s Comparative Cognition Lab.

“Previous studies on episodic-like memory have involved bigger-brained bird species, corvids, which hide food. This study focuses on smaller brained more generalist birds that don’t hide their food. Our findings suggest these birds are more intelligent than they’ve been given credit for.”

Senior author Dr Gabrielle Davidson from the University of East Anglia said: “The birds were behaving naturally in a familiar environment, so we captured something more realistic than if the birds had been captive. It was remarkable to see these birds performed well in our memory tasks while also experiencing a bunch of other memories out in the wild.

“For us, field research is challenging because the birds are completely free not to take part in our experiments and just fly away, but we’ve shown this type of intelligence test in the wild works.”

Nicola Clayton, Professor of Comparative Cognition at the University of Cambridge, an author of the study and James Davies’ PhD supervisor, said:

“It is fascinating that these non-caching species of birds showed episodic-like memory using two independent tests. When I began this research in the late 1990s, most psychologists assumed that the ability to remember the ‘what, where and when’ of unique past events was uniquely human. The initial findings in scrub-jays showed that this was not the case. Subsequent research suggests that this ability is much more widespread in the animal kingdom than we previously thought.”

The researchers suggest that having a more flexible memory could help these birds cope with further environmental stress and fluctuation influenced by climate change.

James Davies said: “This type of memory would allow them to flexibly react to new conditions and combine this information with their original memory to make decisions. So whether they’re thinking about fruit ripening or caterpillars emerging, that’s a powerful ability to have when things get tough.”

The study also might suggest that humans leaving out food for garden birds could be one factor contributing to the evolution of these memory traits, just as these birds have evolved beak adaptations in response to increased reliance on garden feeders.

Dr Gabrielle Davidson said: “It is possible that these birds are picking up on and remembering our routines in terms of when we top up bird feeders. This needs further study.”

 

The tests

To assess ‘what-where-when’ memory, the researchers adapted an existing study design – developed by Nicola Clayton and Anthony Dickinson – to simulate a realistic foraging scenario in which two food items – sunflower seeds and peanut pieces – ran out and replenished at different rates. The foods were selected having already proven that great and blue tits prefer sunflower seeds to peanut pieces.

The birds were given time to learn the ‘temporal feeder’ rules before the tests began. When an individual was first detected on the ‘preferred’ sunflower seed feeder, this triggered a 2-hour period of availability to that bird. After that point, a ‘replenish period’ began and the feeder door remained closed to that individual until the following day.

To pass the memory test, birds have to remember the details of this experience and apply it to new situations. This means that when they come back to the feeders 2 hours later, they should remember they had already eaten their favourite food, and that only their less preferred food is currently available.

This research shows great tits and blue tits make this switch, without having to check if their favourite food is available. This switch in behaviour, based on previous experience, is what indicates these birds use episodic-like memory - comparable to studies involving captive rodents, dogs, corvids, cephalopods and non-human primates.

Only a bird’s first choice after each interval was counted to ensure that their critical choice regarding which feeder to visit was based on a memory of their first visit of the day, rather than a reaction to a non-rewarding feeder (i.e., a win-stay/lose-shift strategy).

 

An advantage for juvenile birds

In a different task, the researchers tested birds on their ability to recall ‘incidental details’ of feeders to locate food.

In a ‘where’ test, the feeders were arranged in a triangle and in a straight line. In the ‘which’ test, each feeder was painted a different colour (yellow, red or blue) or pattern (black stripes, wavy lines, or spots on a white background).

While most birds passed the ‘where’ test, in the ‘which’ test only the juveniles recalled visual clues to help them access food.

James Davies said: “We didn’t expect that finding. We already know juvenile blue tits and great tits have to be more innovative in their foraging because adults outcompete them and monopolise food, which may help to explain our own findings. As blue tits and great tits gain experience, perhaps they start to rely less on visual information and more on spatial information.”

Professor Clayton said: “The next step is to test whether individual birds that are better at using their episodic-like memory have enhanced reproductive success, in which case we would expect that memory system to evolve in response to more challenging environmental conditions.”

A great tit wearing a radiofrequency identification tag as used in the study

A great tit wearing a radiofrequency identification tag as used in the study.

CREDIT

James ONeill

Funding

The study received financial support from the University of Cambridge.

Dr Gabrielle Davidson was funded by an Isaac Newton Trust and Leverhulme Early Career Fellowship (ECF-2018-700).

 

Reference

J.R. Davies, L.S. Keuneke, N.S. Clayton & G.L. Davidson, ‘Episodic-like memory in wild free-living blue tits and great tits’. Current Biology (2024). DOI: 10.1016/j.cub.2024.06.029

 

 

Early-onset El Niño means warmer winters in East Asia, and vice versa


Analyzing 100 different climate simulations over the past 61 years to find how El Niño determines warm or cold winters in Japan


KYUSHU UNIVERSITY

Sea surface temperature anomaly relative to the average for 1982-2023 

IMAGE: 

DIGITAL RENDERING OF THE 2023/24 EL NIÑO IN THE EQUATORIAL PACIFIC. IN JUNE 2023, ITS PATTERNS WERE ALREADY CONSPICUOUS.

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CREDIT: KYUSHU UNIVERSITY/MASAHIRO SHIOZAKI




Fukuoka, Japan—The phenomenon known as El Niño can cause abnormal and extreme climate around the world due to it dramatically altering the normal flow of the atmosphere. In Japan, historical data has shown that El Niño years tend to lead to warmer winters. This case was exemplified recently with Japan’s warm 2023-2024 winter season. However, there have also been cases of cold winters in Japan during El Niño years, such as the one recorded in 2014-2015. Yet, it was unclear as to why this was occurring.

Publishing in the Journal of Climate, researchers from Kyushu University’s Research Institute for Applied Mechanics have found that the early onset of El Niño around June leads to warm winter climates in East Asia, while the late onset of El Niño is associated with colder winters. The team hopes that their results can help better model winter climate patterns in East Asia during El Niño years, and lead to more accurate long-term climate predictions.

El Niño is a climate pattern characterized by the warming of the tropical eastern Pacific Ocean caused by the weakening of equatorial trade winds that blow from the western coast of South America to the Philippines and Indonesia. In regular years, these trade winds would push the ocean’s warmer waters westward leading to cooler waters rising in the east. These warmer western waters drive atmospheric convection generating clouds and rain.

“Each El Niño is individually unique, and no two El Niños are exactly alike,” explains Post-doctoral Fellow Masahiro Shiozaki who authored the study. “Naturally, these differences lead to a variety of abnormal global climate patterns. To better predict regional weather and climate during El Niño, it is important to know how and where the atmosphere changes.”

Shiozaki highlighted a case in Japan during the winter of 2023-2024. This was an El Niño year, and in Japan that tends to mean a warmer winter. And in fact, the winter of 2023-2024 was inordinately warm. However, this was not always the case. In the El Niño year of 2014-2015, Japan’s winter was colder than average.

“Japanese winters are also influenced by the Arctic as well as strong natural variability inherent to the atmosphere. Because of these various effects, it has been challenging to identify how El Niño determines warm or cold winters in East Asia,” continues Shiozaki. “To address this issue, we simulated the weather patterns of the past 61 years in 100 different ways by adding perturbations to the weather patterns. In this simulation, 1700 El Niño events occurred, and we calculated how the atmosphere changed each time. This method allowed us to reduce any atmospheric noise in the data, giving us a clearer view of El Niño’s direct impact.”

The team’s analysis found that it was not only El Niño, but also an anomalous warming of the tropical Indian Ocean that led to warmer East Asian winters. The early onset of El Niño around June effectively warmed the Indian Ocean from summer to winter. This ocean warming suppressed atmospheric convection over the tropical western Pacific, resulting in less rainfall and atmospheric heating.

“The resulting reduction in atmospheric heating excited atmospheric waves that propagated into the western North Pacific, forming an anomalous anticyclonic circulation southeast of Japan,” Shiozaki explains. “Anomalous south-easterly winds from this circulation pattern weakened the northwesterly winter monsoon from the continent, leading to the warm winter climate in East Asia. On the other hand, cold Japanese winters are associated with a late onset of El Niño and no significant warming of the Indian Ocean.”

The team hopes their new findings will be utilized by researchers and meteorologists to better predict climate patterns months in advance, especially during active El Niño phases.

“The influence of global warming is clear in the recent trend of warmer winters worldwide. The effects of rising water temperatures are especially evident in the Indian Ocean,” concludes Professor Hiroki Tokinaga who led the research team. “Further research is needed to determine how global warming and other tropical climate phenomena will change future winters in East Asia.”

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For more information about this research, see “What Determines the East Asian Winter Temperature during El Niño?— Role of the Early-Onset El Niño and Tropical Indian Ocean Warming," Masahiro Shiozaki, Hiroki Tokinaga, and Masato Mori Journal of Climatehttps://doi.org/10.1175/JCLI-D-23-0627.1

About Kyushu University 
Founded in 1911, Kyushu University is one of Japan's leading research-oriented institutes of higher education, consistently ranking as one of the top ten Japanese universities in the Times Higher Education World University Rankings and the QS World Rankings. The university is one of the seven national universities in Japan, located in Fukuoka, on the island of Kyushu—the most southwestern of Japan’s four main islands with a population and land size slightly larger than Belgium. Kyushu U’s multiple campuses—home to around 19,000 students and 8000 faculty and staff—are located around Fukuoka City, a coastal metropolis that is frequently ranked among the world's most livable cities and historically known as Japan's gateway to Asia. Through its VISION 2030, Kyushu U will “drive social change with integrative knowledge.” By fusing the spectrum of knowledge, from the humanities and arts to engineering and medical sciences, Kyushu U will strengthen its research in the key areas of decarbonization, medicine and health, and environment and food, to tackle society’s most pressing issues.