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Science Round-Up: DNA yields new insights on early Caribbean migration

Ayee Macaraig
June 8th, 2020


This article is more than 4 years old.

Meanwhile, other research concludes that cuckoo chicks have innate GPS and that an education in music is no longer accessible to every child in Denmark

With a shoreline this appetising, there was plenty of incentive to come (photo: publicdomainpictures.net)

Using old DNA samples, research involving the University of Copenhagen has found evidence of at least three waves of early migration to the Caribbean from different parts of the American mainland.

The first two waves in the western Caribbean appear to be linked to populations from North America, while the third, more recent wave came from South America.

Water no barrier
The researchers said the findings challenge the view that large bodies of water were barriers to humans and also demonstrate that the early settlers in the Caribbean were biologically and culturally diverse.

The Caribbean was one of the last regions of the Americas to be settled by humans.


Cuckoo chicks have innate GPS
Cuckoo chicks have an innate, internal GPS as they instinctively know where to fly to without having been there before. Researchers from the University of Copenhagen equipped young cuckoos with tiny transmitters and tracked their migration via satellites. The findings show that without anyone teaching it, a young cuckoo can find its way to a special wintering site in Africa even if it is moved 1,800 km away from its original route. The study lays the foundation for a broader knowledge of bird migration, which is deemed important to understanding the spread of diseases and climate change.

Some rights suspended during Coronavirus Crisis
Some constitutional rights were suspended during the Coronavirus Crisis, such as those related to property and religion, according to a law professor at the University of Southern Denmark. Frederik Waage said the restrictions that the government imposed under the epidemic law suspended liberties such as the right to attend church or a restaurateur’s right to stay open. However, he said that such infringements may be considered legal if they are carried out with an eye to balance the interests of society with individual rights. He added that the health minister, Magnus Heunicke, is officially the most powerful minister in Danish history in peacetime as he has enjoyed the authority to decide whether thousands of companies should be opened or closed.

Music education weakens in Denmark
There has been a noticeable decline in music education in Denmark, breaking the tradition that it must be accessible to everyone. A study by the Danish School of Education of Aarhus University found that there are varying levels of quality and access to music education in different places in Denmark partly because music is not a priority in many schools and municipalities. There are also not enough music teachers at the public schools, while new ones do not have the necessary skills. To address the divide in music education, researchers said political leaders must find a renewed appreciation for the subject’s importance.

Beware the rare tick virus
It is not only the coronavirus that people fond of the great outdoors should be wary of. A rare tick virus is becoming more prevalent in Denmark compared to ten years ago, according to epidemiologists at the University of Copenhagen. Tick-borne encephalitis (TBE) is an illness caused by a virus spread through bites from forest ticks, usually infecting people who regularly go on nature trails. Symptoms include a flu-like illness and, in some cases, brain inflammation. It used to be seen only in Bornholm but is now also spreading in other areas. It is unclear what has caused the prevalence, but the State Serum Institute (SSI) contends it may be due to climate change. Both children and adults can be vaccinated in consultation with their doctor.


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A survey carried out by Megafon for TV2 has found that 71 percent of parents have handed over children to daycare in spite of them being sick.

Moreover, 21 percent of those surveyed admitted to medicating their kids with paracetamol, such as Panodil, before sending them to school.

The FOLA parents’ organisation is shocked by the findings.

“I think it is absolutely crazy. It simply cannot be that a child goes to school sick and plays with lots of other children. Then we are faced with the fact that they will infect the whole institution,” said FOLA chair Signe Nielsen.

Pill pushers
At the Børnehuset daycare institution in Silkeborg a meeting was called where parents were implored not to bring their sick children to school.

At Børnehuset there are fears that parents prefer to pack their kids off with a pill without informing teachers.

“We occasionally have children who that they have had a pill for breakfast,” said headteacher Susanne Bødker. “You might think that it is a Panodil more than a vitamin pill, if it is a child who has just been sick, for example.”

Parents sick and tired
Parents, when confronted, often cite pressure at work as a reason for not being able to stay at home with their children.

Many declare that they simply cannot take another day off, as they are afraid of being fired.

Allan Randrup Thomsen, a professor of virology at KU, has heavily criticised the parents’ actions, describing the current situation as a “vicious circle”.

“It promotes the spread of viruses, and it adds momentum to a cycle where parents are pressured by high levels of sick-leave. If they then choose to send the children to daycare while they are still recovering, they keep the epidemic going in daycares, and this in turn puts a greater burden on the parents.”