microplastics that reach the seabed do not degrade

Microplastics at the bottom of the oceans do not decompose

These particles of less than 5 mm are found everywhere – in mountains, rivers. They are even found in Antarctica. And we were talking about whales

here, they eat tons every year. And of course, most of it is lost in our oceans. Estimates of their amount are different. L

the latest give your number

24 billion microplastics in the seas of the earth.

To study the fate of these particles, these scientists went to take samples from the Ebro delta in southern Catalonia. We are talking about coring. This core, extracted from a depth of one hundred meters, was then cut into slices to analyze the microplastic content of each layer and study their degradation.

The researchers then dated the samples with lead-210 to establish a chronology of each part of the sediment in order to understand what happened to these microplastics over time.

As a result, microplastics have been accumulating for 50 years and this accumulation is accelerating. It tracks global production… And the second discovery is that microplastics at the bottom of the oceans don’t break down.

Interview with Michaël Grelaud, Researcher and co-author of the Institute of Environmental Sciences and Technologies of the Autonomous University of Barcelona

to learn


1 min

Science, CQFD

58 min

Some organisms feed on viruses

They are best known for their pathogenicity. But viruses are composed of proteins and lipids. Perfect for a “balanced meal”.


This is researchers from the University of Nebraska wondered if some creatures could benefit from consuming the virus. They cultured freshwater plankton collected from the pond with chloroviruses. And after two days the sample had almost no virus, on the other hand there was a strong growth of plankton…

And to make sure that these organisms were indeed feeding on this virus and not something else, they labeled the viral DNA with a fluorescent dye. As a result, the plankton light up, which is a sign that they are filtering themselves on this holiday. The lead author explains that this result is not really surprising. We just didn’t notice it before. It’s a diet he calls virovory, and it’s probably not unusual in nature. This opens up a new field of investigation into the impact of this virovoria on the interactions and evolution of organisms.

Degradation of coral reefs causes fish to fight unnecessarily

Their shortcomings cause them to waste their energy. To emphasize it,

A research team at Lancaster University in EnglandHe studied the interactions of more than 38 species of butterflies found on reefs in the Philippines.

After a sea heat wave in 2016, the coral bleached, a sign of its decline. It is an important food source for tropical fish.

Thus, scientists noticed that fish are more likely to fight with each other, to protect a piece of coral, sometimes chasing their opponent for more than 50 meters. According to the lead author, the waste of precious energy and futile attacks can drive them to true starvation and have consequences for other links in the food chain.

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Scientific method

58 min

Save on your personal Hubble!

NASA is calling for an extension to the life of this aging telescope, which was launched more than three decades ago. It’s still doing pretty well… It’s just… falling… Slowly but surely, its orbit is decreasing and it’s going to crash into Earth. Therefore, it needs to be given a little push to raise its orbit.

Last October The feasibility study of this project was entrusted by NASA to SpaceX, but the American agency explained that it remains open to other ideas.

Therefore, he calls other companies and industrialists prepare their own rescue bid. But NASA is clear that it will not pay a penny for this mission, which will remain the responsibility of the partners.

Scientific method

58 min

We thank Michaël Grelaud for his valuable explanations

To continue

The amount of microplastics at the bottom of the Mediterranean Sea has tripled in 20 years (Dry Meditation)

Microplastic Research (Environmental Science and Technology)

As the amount of plastic present in the oceans increases, it has been drastically re-evaluated (the world)

Researchers have discovered that viruses can feed on living things rather than infecting them (GEO)

Virovory Research (PNAS)

Global warming, white coral and butterfly fish are fighting (release)

Butterflyfish research (english)

NASA refuses to abandon Hubble and appeals to extend it (Future Science)

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