Education
What made The Meg so big?
HAVE you ever wondered why the Megalodon shark became to be so big? Or wondered why some other sharks are much smaller?
In a paper published by Evolution, research led by Swansea University’s Dr Catalina Pimiento and co-authored by an international team of scientists from the UK, Europe and the USA examined the biological traits of all sharks and rays before running a series of evolutionary models to seek how gigantism evolved over time.
The results showed that for a shark to be giant, it would need to first evolve adaptations that enhance feeding such as the ability to control – at least to some degree – their own body temperature or become a filter feeder.
One of the most famous giant sharks, Megalodon – the topic of 2018 Hollywood film The Meg – was an active predator that could measure up to 18 metres in length and became extinct around two million years ago.
Meanwhile, the whale shark – which is still around today – can also reach 18 metres but isn’t an active predator. Instead, it is a filter feeder and eats tiny plankton from the sea.
These two subjects formed key parts of the research, which centred on the tree of life for sharks, where the authors mapped characteristics relating to body size, like their thermo-regulatory capacity, feeding mechanism and diet.
Researchers then found that sharks could become giants by following one of two possible evolutionary pathways; the mesothermic pathway, which consists of evolving the ability to self-control the temperature of their most important organs – or the filter-feeding pathway, which consists of evolving the ability to feed on microscopic plankton.
The mesothermic adaptation allows sharks to live in different types of habitats – including cold waters – and also hunt more effectively. The filter-feeding adaptation allows sharks to eat the most abundant food in the ocean – plankton.
However, there are risks involved for any shark following the evolutionary pathways that lead to gigantism.
The mesothermic species need to consume big prey to maintain their high energetic demands, but when these prey are scarce, giant sharks are more susceptible to extinction. The scarcity of large prey in times of rapid climatic change was the most likely cause of the extinction of Megalodon.
While the filter feeders have shown more resilience, they are at risk of eating large volumes of toxic microplastics that now can be found in the world’s oceans – thus threatening their extinction.
Dr Catalina Pimiento, lead researcher and Postdoctoral fellow at Swansea University, said: “Sharks provide an ideal case study to understand the evolutionary pathways leading to gigantism in the oceans because they display contrasting lifestyles and adaptations and because they have an evolutionary history of at least 250 million years.”
Notes:
Photo credit: Guillermo Torres. Banco de Imágenes Ambientales (BIA), Instituto Alexander von Humboldt.
Education
Pembrokeshire free school transport call to be heard at County Hall
A CALL to allow school pupils from Johnston and Tiers Cross access to free school transport to the nearby Haverfordwest high school is to be heard by councillors next week.
Due to a change in catchment areas the pupils are no longer able to access free transport to Haverfordwest, instead coming under the Milford Haven catchment area.
A petition calling for the reinstatement of the former catchment area to access free transport for pupils to Haverfordwest was recently started in the county.
The e-petition, which ran from September 18-November 1 on the council’s own website, attracted 351 signatures, meeting the threshold for a debate at the relevant Pembrokeshire County Council overview and scrutiny committee, in this case the Schools And Learning Overview And Scrutiny Committee meeting of November 28.
The petition, started by Kirsty Coaker, reads: “We call on Pembrokeshire County Council to change Johnston and Tiers Cross School Catchment back to Haverfordwest.
“Children of Johnston and Tiers Cross are now ineligible for free school transport to Haverfordwest High due to the areas no longer being in ‘catchment’.
“Both Johnston and Tiers Cross are Haverfordwest postal codes and are classed as Haverfordwest, yet the school catchment is Milford Haven.
“Please help our children access suitable transport to and from secondary school.”
The e-petition will now be considered at the November 28 meeting.
Education
Creative contributions in Operation Ivydene ASB poster competition
STUDENTS from across Carmarthenshire, Ceredigion, Pembrokeshire and Powys have been recognised for their outstanding contributions to a poster competition run as part of the Dyfed-Powys Police Operation Ivydene initiative.
Over the past few months, primary and secondary schools across the four counties were invited to submit designs highlighting the impact of anti-social behaviour (ASB) and the importance of promoting safer neighbourhoods.
Last week, the posters were judged by a panel of police officers and crime prevention specialists to come up with the winners.
A special prize-giving ceremony was held on Monday 18th November, where the five winning students were honoured for their outstanding contributions.
‘Antisocial behaviour’ is a broad term which includes behaviour that has caused or is likely to cause harassment, alarm or distress to a member or members of the public. Criminal and non-criminal behaviours such as littering, vandalism, public drunkenness, aggressive dogs, or noise nuisance may also be considered ASB.
Caryl Griffiths, ASB Hotspot Co-ordinator for Dyfed-Powys Police said: “The goal of this competition was to engage students in understanding the effects of anti-social behaviour on their communities, and to inspire them to think about how they can contribute to a safer, more supportive environment.
“Judging the competition was challenging due to the high standard of entries, but we ultimately selected five winners who showed exceptional creativity and thoughtfulness.
“A special thanks to Bethan James, our Schools Service Manager, for her role in bringing all the schools together.
Until March 2025, ten of the areas worst hit by antisocial behaviour across Carmarthenshire, Ceredigion, Pembrokeshire, and Powys will receive additional dedicated ‘Hotspot’ police patrols through Operation Ivydene, thanks to an injection of cash from the Home Office, secured for the force by Police and Crime Commissioner Dafydd Llywelyn.
The patrols focus on tackling these types of issues in the following areas:
- Carmarthenshire – Tyisha, Elli / Llanelli town centre, Carmarthen town and Ammanford.
- Ceredigion – Aberystwyth and Aberaeron.
- Pembrokeshire – Haverfordwest town centre and Tenby town centre.
- Powys – east Newtown and Brecon.
Inspector Darren Crockford said: “Operation Ivydene is a targeted initiative that uses a ‘Hotspot’ policing approach to address and behaviour that constitutes ASB and causes harm and alarm in the community.
“Hotspots have been selected as the areas experiencing the highest volumes of violence and antisocial behaviour (ASB) offences and based on local intelligence.
“The patrols aim to provide a reassuring presence to help people feel safe while also proactively disrupting crime and acting as a deterrent.
“An important element of the overall Operation Ivydene approach will be to engage with our communities having meaningful discussions about how ASB impacts the community, and encourage them to take an active role in creating safe and positive places to live.”
Bethan James, Dyfed-Powys Police Schools Service Manger added: “Our Schools Service offers crime prevention sessions to children and young people on topics such as ASB where we use bespoke films and real-life examples to reflect victims’ experiences and explore the boundaries between fun and fear.
“Sessions delivered by our team of Schools Police Officers are specifically designed to challenge mindsets and attitudes in a safe and supportive learning environment.
“The discussions between the officers and the learners explore the long-lasting, harmful effects of ASB, about crimes and consequences and where children can find advice and support.”
During national Anti-Social Behaviour Week, Dyfed-Powys Police is sharing information to help members of the public recognise, report, and get support for anti-social behaviour. Follow them on Facebook for more information.
Charity
‘Grave concerns’ over national insurance hike
SENEDD Members expressed grave concerns about the impact of the UK Government’s national insurance tax hike on GPs, universities and charities in Wales.
Plaid Cymru leader Rhun ap Iorwerth warned the rise in employer national insurance contributions from 13.8% to 15% in April will have a disproportionate impact in Wales.
He told the Senedd: “Labour are quick to accuse others of fantasy economics whilst their own plans represent nightmare economics for thousands of employers and employees.”
Raising concerns about the impact on job creation and wages, he said employment levels are at their lowest for almost a decade – lower than anywhere else in the UK.
He accused Labour of breaking a manifesto pledge as he pointed to an Office for Budgetary Responsibility (OBR) assessment that three quarters of the cost will be passed to workers.
Leading a debate on November 20, Mr ap Iorwerth called on the UK Treasury to fully cover the added cost to public sector employers in Wales.
He said: “It’s not the private sector only … bearing the brunt. Charities, GPs, universities – sectors already feeling the squeeze, to say the very least – have been taken to the brink.”
He pointed to “eye-watering” bills of £90,000 for some GPs, with the British Medical Association warning some surgeries could close as a consequence.
Mr ap Iorwerth said mental health charity Plattform faces a £250,000 annual bill and Welsh universities, “already crippled by financial challenges”, will face significant further pressures.
Plaid Cymru’s motion urged Welsh ministers to press the UK Government to apply a wider definition of the public sector workforce to include universities, GPs and charities.
Peter Fox, the Conservatives’ shadow finance secretary, similarly accused Labour of breaking a manifesto commitment not to raise tax on working people.
The former council leader said: “Time and time again – the chancellor went on TV and made the claim, only to u-turn after they got into power.”
Mr Fox, who represents Monmouth, said even a 1% rise in employer national insurance contributions for the public sector would cost Welsh taxpayers an extra £100m.
He told the Senedd: “The UK Government has said that it will provide funding to cover the cost of national insurance contributions for those workers.
“However, this will still come out of the taxpayer’s pocket … ultimately it is the taxpayers who are going to pay for the Chancellor’s tax increase.”
Luke Fletcher, Plaid Cymru’s shadow economy secretary, warned the national insurance rise will be a drag on an “already anaemic” Welsh jobs market.
His colleague Sioned Williams, who also represents South Wales West, described the chancellor’s “back-of-a-fag-packet” plans as senseless.
She raised concerns about six-figure increases in tax bills for charities including Tenovus, Marie Curie, Citizens Advice Cymru and the Wastesavers Charitable Trust.
Cefin Campbell, Plaid’ Cymru’s shadow education secretary, said the national insurance increase will cost Welsh universities an estimated extra £20m a year.
The Mid and West Wales MS warned: “Without a shadow of a doubt, these additional costs could push our higher education institutions over the precipice.”
Labour’s Hefin David said difficult decisions had to be made to fill a £22bn “black hole” left by the Tories but he rejected Plaid Cymru claims of a return to austerity.
Dr David told the Senedd: “Yes, tough decisions have to be made but I think that in the longer term, this is to everyone’s benefit.”
Andrew RT Davies, leader of the Conservative opposition, disputed the “incorrect” £22bn figure, saying the OBR found a £9bn gap.
Replying to the debate, Mark Drakeford stressed that neither he nor the Welsh Government has responsibility for national insurance contributions.
Wales’ finance secretary, who was appointed in September, criticised “fantasy economics” from opposition members on the Plaid Cymru and Conservative benches.
Deriding the “politics of the playground”, he said: “Both of them are willing to spend money on almost anything; neither of them are willing to raise the money necessary from anyone.”
Prof Drakeford said the chancellor returned national insurance broadly to where it had been as a share of gross domestic product for 13 of the 14 Conservative years.
The former First Minister pointed out that the UK Government offset national insurance rises on small employers by more than doubling the employment allowance.
He told the debating chamber or Siambr: “If you want to pay for things, you have to find the money to do so. That is what the chancellor had to do. That is how we will get the money that will come to public services here in Wales.”
Senedd Members voted 25-19 against Plaid Cymru’s motion.
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