Thursday, February 20, 2025

 

Mystery Surrounds Reports of Cargo Ship in Distress in Sea of Azov

vessel stuck in sea ice
Video shows the vessel caught in heavy sea ice but does not indicate the time or location (BAZA on Telegram)

Published Feb 20, 2025 1:40 PM by The Maritime Executive

 


Russian authorities are denying media reports that another one of the decrepit fleet of ancient cargo ships operating on the Sea of Azov is in distress. The media is saying the vessel was taking on water while the authorities insist the vessel was in port and repaired.

The general cargo ship Pavel Grabovsky, built in 1979, loaded a cargo of 3,000 tons of corn and departed Rostov-on-Don bound for Turkey.  After passing the city of Azov, the vessel reportedly encountered ice and was damaged on February 16 without issuing a distress call.

The media indicated the vessel struck ice and the crew was attempting to control the flooding with its pumps. However, at some point during the week, the crew realized they were not able to control the flooding and asked for permission to return to Azov.

The reports vary from here with the media saying the ship had too deep a draft and due to water levels was unable to reach the port and went aground. The icebreakers Kapiran Demidov and Kapitan Chudinnov were reported to be making their way to assist the vessel.

 

 

TASS issued an official report denying the media accounts and saying the vessel had reached Azov and repairs were made. They however are admitting the vessel went aground but said it was due to weather conditions as the cargo ship was departing Azov to resume its trip to Turkey. Citing the Ministry of Transport, TASS indicates that when the weather improves and sea levels rise, the vessel will be removed from the roadstead and the owner will make further repairs.

The vessel is registered in Panama and 3,100 dwt. Equasis indicates it has been under the management of a Turkish company since 2013. The Pavel Grabovsky had a similar incident in 2013 when it had to be rescued after stranding. At the time, it was registered in Sierra Leone. There was a crew of 14 aboard and they had loaded a cargo of wheat. The ship went aground in the port of Azov.

Records show the vessel was inspected at the end of January 2025 in Georgia. The report lists eight deficiencies but no detention order was issued. The issues ranged from problems with the life saving equipment to piping, electrical, safety of the pilot ladders, and documentation.

After two incidents at the end of 2024 involving Russian sea-river tankers near the Kerch Strait at the exit from the Sea of Azov, the Russian Ministry of Transport reportedly issued an inspection order for all the old vessels operating in the region. Officials indicated as many as 500 shipping companies and their vessels would be subject to the inspections as part of an effort to improve the image of shipping and the response to the oil spill from one of the tankers lost in December.


Authorities Explore if Tankers in the Russian Oil Trade Are Being Targeted

crude oil tanker at sea
Greece's Thenamaris confirmed that Italian and Greek authorities are investigating damage to two of the company's crude oil tankers (Thenamaris)

Published Feb 20, 2025 3:01 PM by The Maritime Executive

 

Italian authorities are confirming that they have widened the investigation into damage to a Greek-owned tanker offloading last week in a northern Italian port. According to multiple media reports, the investigation is looking at terrorism as details also emerged on two other incidents with tankers in recent weeks in the Mediterranean.

The anti-terrorism unit of Genoa’s Public Prosecutor’s Office has reportedly become involved in the incident that damaged the Greek-owned Seajewel (108,888 dwt) overnight between February 14 and 15. The Port Authority of Savona, Italy confirmed earlier this week that offloading operations had been suspended after anomalies were observed without specifying what happened.

The chief prosecutor told Reuters they have taken the data from the vessel’s “black box” as part of an investigation into possible terrorist activities. The report indicates divers found a 28 x 47-inch hole in the hull of the tanker. Previously the report said the plates were driven inward indicating external force. They also cited the presence of dead fish in the area.

The vessel’s owner Thenamaris of Greece confirmed that the crew was safe while also mentioning that there were third-party individuals involved in the offloading. They said the Greek authorities were also investigating and in the same statement said the investigation involved a second tanker, Seacharm (112,000 dwt) which had been damaged in January while sailing to Turkey.

That caused widespread speculation fueled by a report by Lloyd’s List that detailed yet another previously unreported incident involving a tanker. The reports indicate the product tanker Grace Ferrum (50,000 dwt) was damaged while at anchor in Libyan waters and remains at the port weeks later.

Bloomberg points out that both of the Thenamaris tankers in the past had called at Russia’s Novorossiysk port and previously transported Russian oil. They state that it appears neither tanker was violating sanctions carrying Russian oil this year when they were damaged. The Grace Ferrum had called at Ust-Luga in the Baltic. Russian authorities also asserted that another tanker, Koala, was attacked causing the explosion while it was in the port of Ust-Luga.

The four incidents all occurring in 2025 have prompted media speculation that vessels in the Russian oil trade are being targeted. Italian and Greek investigators will be looking into these allegations as they seek the cause of the damage to the Thenamaris tankers. 

Adding to the speculation are also the allegations that the Russian cargo ship Ursa Major operating as a military sealift ship was attacked causing it to sink in December 2024. The operator of the vessel asserted it was an attack that sunk the vessel while the Russian fleet off Syria also came under pressure with reports of at least one fire aboard a ship being used as part of the Syrian evacuation.

Officials have said it is far too early to link these incidents. They could be a coincidence or possibly someone is targeting shipping supporting Russia.



U Plans to Add 73 More Tankers to Shadow Fleet Blacklist

Eagle S
File image courtesy Finnish Border Guard

Published Feb 19, 2025 10:58 PM by The Maritime Executive

 

As the Trump administration negotiates with Russian officials over a proposed truce in Ukraine, EU officials have released an initial outline of a 16th package of sanctions on Moscow, including 73 more vessels from Russia's "shadow fleet" of aging tankers. 

"The EU is clamping down even harder on circumvention by targeting more vessels in Putin’s shadow fleet and imposing new import and export bans. We are committed to keep up the pressure on the Kremlin," said EU Commission President Ursula von der Leyen in a statement.  

For the first time, the EU has placed restrictions on Russian seaports that are used for evading the G7 price cap on Russian oil. Kozmino, the terminal responsible for exporting the ESPO blend to Pacific buyers, has consistently violated the cap since it was imposed; Primorsk, Ust-Luga and Novorossiysk also routinely export Urals grade crude at prices over the limit. 

Additional measures include a phased ban on Russian aluminum imports, along with new sanctions on specific Russian officials and banks. 

"We keep supporting Ukraine and we keep sanctioning the Russian aggressor, because this is the right thing to do, preserving international rules and order," one EU diplomat told the FT. 

Separately, European officials have leaked an early outline of a Franco-British plan to deploy a small peacekeeping force to Ukraine after a possible end of hostilities. The plan would comprise about 30,000 servicemembers, primarily for defending Ukraine's airspace and its sea lines of communication. The scheme would not put Western troops near the front line, where they could come into contact with Russian forces.

The position broadcast by the U.S. government focused on the commercial opportunities of a rapprochement with Moscow. In a statement Wednesday, the U.S. State Department said that it was negotiating with Russia to establish "future co-operation on matters of mutual geopolitical interest and historic economic and investment opportunities," along with a Ukrainian peace deal that Russia and the U.S. will determine.


 

Chinese Naval Task Force Makes Unusual Transit off Australia's East Coast

The Type 055 cruiser Zunyi (PLA Navy file image)
The Type 055 cruiser Zunyi (PLA Navy file image)

Published Feb 20, 2025 10:54 PM by The Maritime Executive

 

 

The naval forces of Australia and New Zealand are tracking a task force of three Chinese warships off the east coast of Australia, a rare long-distance patrol of PLA Navy forces. 

The Chinese task force includes the fleet oiler Weishanhu, the destroyer Zunyi and the frigate Hengyang.  transited through the Coral Sea and into waters off Australia's northeast coast last week. The frigate arrived separately, transiting the Torres Strait and passing off the coast of the Northern Territories before meeting up with Weishanhu. 

According to the FT, the Chinese task force approached about 150 nautical miles east of Sydney, within Australia's EEZ. It also spent time on the other side of the Tasman Sea, near New Zealand's shores, and Australia has been working closely with its neighbor to monitor the PLA Navy's movements. 

"We have not been informed by the Chinese government why this task group has been deployed into our region, and we have not been informed what its future plans are," New Zealand Defense Minister Judith Collins said. 

Zunyi is a Type 055 cruiser, newly commissioned in 2023. The 13,000-tonne Type 055 is China's largest and most advanced surface combatant, equipped with 112 VLS cells and an advanced AESA radar system. Hengyang is a Type 054A multirole frigate commissioned in 2008. She has 32 VLS cells for air defense missiles and antisubmarine missiles, plus separate deck launchers for another eight antiship missiles. 

"I've instructed that Navy and Air Force assets be deployed to make sure that we are watching exactly what the task group is doing. We'll do that in a manner that is safe and professional. That's very much our right," Australian deputy prime minister Richard Marles told media last week. He noted that the transit is unusual, but not unprecedented.

It is the latest in a long series of encounters between Chinese and Australian forces. On February 11, a Royal Australian Air Force P-8A maritime patrol aircraft was operating over the South China Sea when it experienced "an unsafe and unprofessional interaction" with a PLA Air Force fighter. The Chinese jet fired off flares near the Australian patrol plane, creating risk for the P-8A and its crew, Australia's defense department said. 

 

Five Unions Call on Trump to Proceed with Chinese Shipbuilding Sanctions

Mark Kelly on bridge of training ship
Kelly a graduate of the U.S. Merchant Marine Academy visited Hanwha Philly Shipyard to promote U.S. Shipbuilding (Hanwha Philly Shipyard)

Published Feb 20, 2025 4:28 PM by The Maritime Executive

 


The collation of four of America’s most powerful unions issued a letter calling on Donald Trump to finish the process started under the Biden Administration to sanction China for its efforts to dominate shipbuilding, the maritime and logistics sectors. Trump has stated his concern for the shipbuilding industry while in Congress efforts continue on the proposed SHIPS for America Act, which the sponsors say is the first unified effort to rebuild the U.S. merchant marine and shipbuilding.

The presidents of the United Steelworkers International, International Brotherhood of Electrical Workers, International Brotherhood of Boilermakers, and International Association of Machinists and Aerospace Workers, jointly signed the letter dated February 19. In it, they are, “urging your administration to enforce strong penalties against China for its unfair trade practices, particularly in shipbuilding, maritime, and logistics sectors.”

The five unions filed a formal complaint in March 2024 under the U.S. Trade Act and were successful in getting the Trade Representative’s Office to launch a formal investigation. The Biden Administration came out in favor of the action and carried it through to a formal report and recommendations issued in its closing days.

The letter cites the report and its finding that the “Chinese Community Party advanced a systematic array of unfair trade practices and economic policies designed to dominate and control the maritime, shipbuilding, and logistics sectors.” They highlight the findings that China distributed over $100 billion in unfair support for its shipbuilding industry. They point out that China received 71 percent of the shipbuilding orders in 2024 producing over 1,000 ships last year. They report the U.S. produced fewer than 10 ocean-going commercial ships in 2024 and has fewer than 80 in service. China by comparison they report has more than 5,500 flagged ocean-going merchant vessels.

“We urge you to take responsible action to impose tough penalties against vessels built according to the plans, policies, and actions of the Chinese Communist Party and to adopt complementary policies that rebuild America’s shipbuilding capacity and workforce,” the unions write in their letter to the president. They pointed out last year when they launched this initiative, they called for actions to deter the purchase of Chinese-built ships from entering U.S. ports.

The U.S. Trade Representative made recommendations calling for action. The Biden Administration agreed that responsive action was necessary but left it to the new administration to formulate the steps as part of its broader tariff program against China.

Trump has recently made comments in interviews about the lack of U.S. shipbuilding capabilities. He has said the U.S. might call on Allies such as South Korea to bolster its shipbuilding programs.

China has repeatedly criticized the investigation calling it short-sighted, lacking facts, and shifting blame for the decline of the U.S. shipbuilding industry. They point to the U.S.’s decline in shipbuilding since the 1940s and 1950s and the lack of investment to modernize and employ new technologies. The investigation they said was part of the China fear program led by the U.S.

The call to involve President Trump comes as Senator Mark Kelly and Congresswoman Mary Gay Scanlon visited the Philly Shipyard recently acquired by South Korea’s Hanwha Group. While touring the facilities and the training ship State of Maine which is outfitting at the yard, Kelly highlighted the importance of strengthening the U.S. maritime industry through the bipartisan SHIPS for America Act. He said it aims to rebuild the U.S. shipyard base and expand efforts to recruit, train, and retain skilled mariners and shipyard workers.

 

Team compares degree of housing damage resulting from great east Japan earthquake and all-cause mortality





Tohoku University
Figure 1 

image: 

Kaplan-Meier curves of all-cause mortality according to the degree of house damage caused by the Great East Japan Earthquake (n = 58,320).

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Credit: Tohoku University Tohoku Medical Megabank Organization




Scientists know that natural disasters have negative health effects on survivors, but long-term observations are lacking. To help fill this gap, a Japanese research team has investigated the connection between the degree of housing damage caused by the Great East Japan Earthquake (GEJE) and all-cause mortality, using the data from a cohort study conducted by the Tohoku Medical Megabank (TMM) Project. Using long-term observation periods, this research project shows no significant relationship between the degree of house damage and all-cause mortality.

The work is published in the Journal of Epidemiology and Community Health on January 15, 2025.

On March 11, 2011, the GEJE and tsunami that followed devastated the northeastern coast of Japan. By March 1, 2021, there were 22,318 people dead or missing because of the earthquake and tsunami. The team wanted to understand the negative health effects the disaster had on the survivors, with a focus on the relationship between housing damage the people experienced and all-cause mortality.

For their research, the team used data from community-based cohort study conducted by the TMM Project in disaster-stricken areas. The TMM Project conducted their baseline survey from May 2013 to March 2016 using questionnaires, blood and urine tests, and detailed examinations. More than 59,000 participants took part in the survey. The GEJE survivors had experienced a wide range of physical and mental health challenges including depression, post-traumatic stress disorder, anxiety, liver dysfunction, diabetes, hypertension, and chronic kidney disease, as already revealed by many previous reports.

The research team analyzed their data using the Cox proportional hazards model. This method allows researchers to examine the survival time of patients, where there are several variables present.

"The results of this study showed that the degree of housing damage caused by the GEJE did not affect the overall mortality," said Naoki Nakaya, a professor at Tohoku University. These results may have occurred because the elapsed time until death was short or because the public health activities of each local government may have suppressed the increase in mortality. "For example, diseases may have been prevented by eliminating the burden of medical expenses in disaster-stricken areas and ensuring access to medical care by strengthening the medical system. This finding may also provide evidence that public health efforts do not increase mortality," said Nakaya.

Earlier studies had examined the association with all-cause mortality after natural disasters through observational studies with limited follow-up periods. What sets this study apart is that the researchers adopted a prospective cohort design and followed up approximately 60,000 participants over a long-term period of 6.5 years. They analyzed over 1,700 deaths and considered possible confounding factors.

The research team notes some limitations in their study. The team assessed the degree of damage to houses caused by the GEJE using self-administered questionnaires. The baseline survey period was three years, from May 2013 to March 2016, and misclassification may have occurred because of the participants' recall errors. Also, their baseline survey began approximately two years after the GEJE. Early deaths after the GEJE could not be included in this cohort study. If early deaths were higher among residents who experienced large-scale housing damage, the team notes that this study might have underestimated their mortality risk.

Another limitation is that this study was conducted at two institutions that used different follow-up methods for mortality up until 2021. These different methods could have allowed some deaths to have been overlooked. The team also notes that the social, physical, and lifestyle factors

investigated in this study may have changed after the survey. These factors could have changed because of the damage caused by the GEJE. And because participation was voluntary, this study might have been biased toward healthier people in the community. Although this bias might not affect the internal validity, the team urges caution when generalizing the results regarding the degree of housing damage or mortality.

"Further long-term follow-up studies are needed to examine the long-term health effects of natural disasters on survivors," said Nakaya. The team also notes the need for analysis of the causes of death as outcomes, including cardiometabolic diseases and mental illnesses.

 

New data for risk assessment of submarine landslides


Expedition SONNE310 investigates canyon systems at continental margins off New Zealand



Helmholtz Centre for Ocean Research Kiel (GEOMAR)





Today, the German research vessel SONNE will embark on an expedition off the coast of New Zealand. Under the leadership of Kiel University (CAU), researchers from CAU and the GEOMAR Helmholtz Centre for Ocean Research Kiel will investigate canyons on an active and passive continental slope in the southwest Pacific until 22 March. The aim of the BMBF-funded MAWACAAP project is to identify the factors that determine the frequency, size and location of landslides in cooperation with the partner institutes GNS and NIWA (both based in New Zealand). The data collected will help to improve the risk assessment of submarine landslides in the region and globally, in order to protect inhabited coastal areas and underwater infrastructure such as cables. The programme for Expedition SO310, which will depart from Wellington, will include extensive seismic surveys and geological sampling.

Exploring active and passive continental slopes

The Palliser and Pegasus Canyon research sites off the coast of New Zealand are only 190 kilometres apart, but are located on opposite continental slopes. While Palliser sits on an active continental plate boundary, where earthquakes can often trigger landslides, Pegasus Canyon is considered geologically quieter. Passive margins are often characterised by the accumulation of thick, undisturbed sedimentary deposits. Here, changes in sea level due to climate change may play an important role in potential instability. Despite previous studies of canyons on active and passive margins, there has been little direct comparison of field data have been made. The researchers hope to fill this gap during the expedition.

“We hope that the new data we will obtain from the extensive seismic measurements and the sediment cores collected during the cruise will help us to better understand the hazard and risk potential of large underwater canyons for the coasts,” says Chief Scientist Professor Dr. Sebastian Krastel, Head of the Marine Geophysics and Hydroacoustics Working Group at Kiel University. “On this new expedition, we have the unique opportunity to directly compare different underwater canyons.”

Comprehensive Survey and Drilling Programme

The programme will include extensive seismic surveys and seafloor sediment sampling to analyse sedimentary structures and climatic and geological controls. The sediments, deposited over many geological eras, will be tested for strength and permeability, and bathymetric maps will be produced to determine the size, volume and age of past landslides. The aim is to create a database of the frequency-volume relationship of these two canyons, which will provide important indicators for landslide risk assessment. "If we understand the influence of rock strata, the role of topography and the frequency and size of submarine landslides, we can also better predict future canyon activity," says co-chief scientist Dr Anke Dannowski from the GEOMAR Helmholtz Centre for Ocean Research Kiel.

On 17 February, the German Embassy and the German Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung, BMBF) hosted a reception for 50 invited guests on the ship in Wellington Harbour. As part of the climate talks, scientists from Germany and New Zealand presented their research topics under the theme “German and New Zealand Research - The Power of Synergies”.

 

Expedition at a glance:

SONNE-Expedition SO310

Name: MAWACAAP (Quantifying the role of submarine canyon slides at active and passive margins)

Chief Scientist: Prof. Dr Sebastian Krastel, Institute of Geosciences, Kiel University

Duration: 20.02.2025 - 22.03.2025

Start and End: Wellington (Aotearoa, New Zealand)

Area: South West Pacific

 

Eating walnuts for breakfast may boost your brain function




University of Reading





Eating walnuts for breakfast could improve brain function throughout the day for young adults, a new study has shown.

Researchers at the University of Reading found that eating 50g of walnuts (a generous handful) mixed into muesli and yoghurt led to faster reaction times throughout the day and better memory performance later in the day when compared to eating an equivalent calorie-matched breakfast without nuts.

The research, published this month in Food & Function, involved 32 healthy young adults aged 18-30 who consumed both a walnut-rich breakfast and a matched breakfast on separate occasions. Participants completed various cognitive tests while their brain activity was monitored in the six hours after eating each breakfast.

Professor Claire Williams, who led the research from the University of Reading, said: “This study helps strengthen the case for walnuts as brain food. A handful of walnuts with breakfast could give young adults a mental edge when they need to perform at the top of their game. It's particularly exciting that such a simple dietary addition could make a measurable difference to cognitive performance."

More work to be done

The findings build on previous research showing the cognitive impacts of regular nut consumption, including walnuts. This is the first study to examine the immediate effects of walnuts on brain function in young adults throughout a single day.

Brain activity recordings revealed changes in neural activity that suggest walnuts may help the brain work more efficiently during challenging mental tasks, while blood samples revealed positive changes in glucose and fatty acid levels - both factors that could influence brain function. The researchers suggest that walnuts' mix of nutrients - including omega-3 alpha linolenic fatty acids, protein, and plant compounds called polyphenols - may enhance cognitive performance. However, they note that more research is needed to fully understand how walnuts produce these beneficial effects on the brain.

The research was conducted at the University of Reading in the UK, at the Centre for Integrative Neuroscience and Neurodynamics (CINN). It was funded by the California Walnut Commission; however, the funders had no role in conducting the study or interpreting the results.

 

Screen time linked to bipolar and manic symptoms in U.S. preteens



Social media, video games, texting, and videos tied to manic symptoms two years later



University of Toronto





Toronto, ON - Preteens who spend more time on screens are more likely to develop manic symptoms years two-years later, according to a new study published in Social Psychiatry and Psychiatric Epidemiology.

The findings reveal that 10- to 11-year-olds who engage heavily with social media, video games, texting, and videos show a greater risk of symptoms such as inflated self-esteem, decreased need for sleep, distractibility, rapid speech, racing thoughts, and impulsivity — behaviors characteristic of manic episodes, a key feature of bipolar-spectrum disorders.

“Adolescence is a particularly vulnerable time for the development of bipolar-spectrum disorders,” said first author, Jason Nagata, MD, an associate professor of pediatrics at the University of California, San Francisco. “Given that earlier onset of symptoms is linked with more severe and chronic outcomes, it’s important to understand what might contribute to the onset or worsening of manic symptoms in teenagers.”

Symptoms of social media and video game addiction, characterized by the inability to stop despite trying, withdrawal, tolerance, conflict, and relapse, may play a role. “Screen addictions and irregular sleep patterns may exacerbate manic symptoms in susceptible teens,” said Nagata.

The study adds to the wealth of knowledge on the associations between screen use and poor mental health in adolescents. The study uses data from the nationwide Adolescent Brain Cognitive Development (ABCD) study, the largest long-term study of brain development in the United States.

“This study underscores the importance of cultivating healthy screen use habits early,” says co-author Kyle Ganson, PhD, assistant professor at the University of Toronto’s Factor-Inwentash Faculty of Social Work. “Future research can help us better understand the behaviors and brain mechanisms linking screen use with manic symptoms to help inform prevention and intervention efforts.”

The study collected data from 9,243 early adolescents aged 10-11 years. Study participants provided information about their typical screen habits, as well as whether they had experienced manic or hypomanic symptoms.

“Although screen time can have important benefits such as education and increased socialization, parents should be aware of the potential risks, especially to mental health,” said Nagata. “Families can develop a media plan which could include screen-free times before bedtime.”

 

The inner ear of Neanderthals reveals clues about their enigmatic origin

New study challenges the theory that Neanderthals originated after an evolutionary event that implied the loss of part of their genetic diversity

Peer-Reviewed Publication

Institut Català de Paleontologia Miquel Crusafont

Life appearance of a male Neanderthal 

image: 

Life appearance reconstruction of a Neanderthal male at the Natural History Museum of London. (Photo: Allan Henderson under CC BY 2.0)

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Credit: Photo: Allan Henderson, under CC BY 2.0

Neanderthals emerged around 250.000 years ago from European   populations—referred to as "pre-Neanderthals"—which inhabited the Eurasian continent between 500.000 and 250.000 years ago. It was long believed that no significant changes occurred throughout the evolution of Neanderthals, yet recent paleogenetic research based on DNA samples extracted from fossils revealed the existence of a drastic genetic diversity loss event between early Neanderthals (or ancient Neanderthals) and later ones (also referred to as "classic" Neanderthals). Technically known as a "bottleneck", this genetic loss is frequently the consequence of a reduction in the number of individuals of a population. Paleogenetic data indicate that the decline in genetic variation took place approximately 110,000 years ago.

The presence of an earlier bottleneck event related to the origin of the Neanderthal lineage was also a widespread assumption among the scientific community. As such, all hypotheses formulated thus far were based on the idea that the earliest Neanderthals exhibited lower genetic diversity than their pre-Neanderthal ancestors, as consequence of a bottleneck event. However, the existence of a bottleneck at the origin of the Neanderthals has not been confirmed yet through paleogenetic data, mainly due to the lack of genetic sequences old enough to record the event and needed for ancient DNA studies.

In a study led by Alessandro Urciuoli (Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona) and Mercedes Conde-Valverde (Cátedra de Otoacústica Evolutiva de HM Hospitales y la Universidad de Alcalá), researchers measured the morphological diversity in the structure of the inner ear responsible for our sense of balance: the semicircular canals. It is widely accepted that results obtained from studying the morphological diversity of the semicircular canals are comparable to those obtained through DNA comparisons.

The study focused on two exceptional collections of fossil humans: one from the Sima de los Huesos site of Atapuerca (Burgos, Spain), dated to 430,000 years old, which constitutes the largest sample of pre-Neanderthals available in the fossil record; and another from the Croatian site of Krapina, this representing the most complete collection of early Neanderthals and dated to approximately 130.000-120.000 years ago. The researchers calculated the amount of morphological diversity (i.e., disparity) of the semicircular canals of both samples, comparing them with each other and with a sample of classic Neanderthals of different ages and geographical origins.

The study's findings reveal that the morphological diversity of the semicircular canals of classic Neanderthals is clearly lower than that of pre-Neanderthals and early Neanderthals, which aligns with previous paleogenetic results. Mercedes Conde-Valverde, co-author of the study, emphasized the importance of the analyzed sample: “By including fossils from a wide geographical and temporal range, we were able to capture a comprehensive picture of Neanderthal evolution. The reduction in diversity observed between the Krapina sample and classic Neanderthals is especially striking and clear, providing strong evidence of a bottleneck event.”

On the other hand, the results challenge the previously accepted idea that the origin of Neanderthals was associated with a significant loss of genetic diversity, prompting the need to propose new explanations for their origin. “We were surprised to find that the pre-Neanderthals from the Sima de los Huesos exhibited a level of morphological diversity similar to that of the early Neanderthals from Krapina,” commented Alessandro Urciuoli, lead author of the study. “This challenges the common assumption of a bottleneck event at the origin of the Neanderthal lineage,” the researcher stated.

Alessandro Urciuoli is a postdoctoral fellow at the University of Zurich (previously employed at the Universitat Autònoma de Barcelona as a Margarita Salas postdoctoral fellow) and associated researcher at the Institut Català de Paleontologia Miquel Crusafont; Mercedes Conde-Valverde is lecturer at the Universidad de Alcalá and director of the Cátedra de Otoacústica Evolutiva de HM Hospitales and the Universidad de Alcalá.


Schematic representation of the changes in morphological diversity along the evolutionary history of the Neanderthal clade. Sima de los Huesos and, particularly, Krapina populations show similarly large amounts of morphological variation, thus suggesting continuity during the Middle Pleistocene. Later, classic Neanderthals instead appear much less diverse, hence hinting for the presence of a drop in phenotypic variation right after the temperature maximum reached around 120.000 years ago, and at the beginning of the Last Glacial cycle.

Credit

Alessandro Urciuoli (Institut Català de Paleontologia Miquel Crusafont)




Artwork on the schematical representation of the distribuition of morphological variation of th inner ear along time in Neanderthals

Credit

Alessandro Urciuoli (Institut Català de Paleop