Earth

Description de l'item "Terre"

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The old chief and the rain gauge

When instructions are taken very seriously
Hydrocoraux

A (delicious) sample forgotten!

When a sample that had been forgotten turned out to be fascinating

Geneviève Zabré: A determined young researcher

#WomensDay In September 2018, Geneviève Zabré, a young biologist from Burkina Faso, won first place in the international competition for French speakers called “My Thesis in 180 Seconds”. Her victory was due to a very remarkable presentation of her thesis work, supported in part by the IRD. Find out...

4 per 1000 initiative

Capturing carbon in the air and storing it in the ground to fight climate change: this is the goal of the ambitious 4 per 1000 strategy. This initiative, the subject of an international research programme , is mobilising several teams at the IRD.

Mercury levels in tuna: Verifying the size, species, and origin!

Tuna is a widely-loved food around the world, but it can harbour a toxin: methylmercury. According to a recent study, the levels of this toxin in Central and Southwest Pacific tuna depends not only on the size and species of the fish, but also their geographic origin. These results are crucial for...

The effects of gold mining in rivers in French Guiana

A study conducted in the French Guiana basin where artisanal gold mining in occurs has shown there is mercury in the environment from these activities. It is even found in the piscivorous fish and indigenous communities that eat food from the rivers affected. These are important and innovative...

Amazon groundwater quantified at last!

As the Amazon basin is difficult to access, the condition of its water table remained virtually unknown. The mystery was solved thanks to an assessment made by an international team linked to several IRD units and led by LEGOS researchers. This result is all the more interesting in that access to...
falaise-de-glace_glacier-noir

The Achilles heel of Asia’s black glaciers

Why do Asian glaciers melt more slowly than others? Glaciologists are working on this phenomenon, focusing in particular on the many “black glaciers” in the region, covered in moraine debris. They reveal some of their specific characteristics and vulnerabilities.
recif-moorea-2018

The resistance of the Moorea corals

Experts in ocean ecology are investigating the health of coral reefs, put to the test by the increase in natural and anthropogenic disturbances. While there is growing concern about their overall future, certain reefs resist repeated attack, but however lose their diversity.
Flood in Morocco's Tafilalet Valley

Towards the intensification of extreme rainfall events in southern Europe

For the first time, a team including an IRD researcher studied the impact of climate change on extreme rainfall patterns in the entire Mediterranean region. This research is crucial to assessing the risk of severe flooding in this region.
barge-d-orpaillage-sur-le-maroni

The Maroni River threatened by gold mines

How have the environmental changes that have occurred in recent decades in French Guiana, including gold extraction in the hinterland, affected the Maroni River? A team involving IRD researchers analysed changes in sediment flows in this water course since 2000. Their findings are alarming.
Fruit trees and legumes combined with food crops

Carbon storage: what matters is the input!

After 15 years of climate smart agricultural practices in Madagascar, researchers are categorical: while these alternative methods help increase soil carbon storage, their effectiveness varies substantially. The assessment must therefore be carried out on the scale of the territory.
Root nodules of Discaria (Order: Rosales), a non-legume species capable of nitrogen-fixing symbiosis.

Nitrogen-fixing symbioses reveal themselves

Recent research has revealed the origin and evolution of symbiotic relationships between certain plants and soil bacteria in order to use atmospheric nitrogen. This knowledge could ultimately contribute to the development of sustainable agriculture minimising the use of chemical fertilisers.
Water run-off on degraded soil and gully erosion due to flooding, in the Mélé Haoussa basin in Niger

New hydroclimatic conditions in the Sahel

The latest figures on soil and climate help explain the enigmatic ups and downs observed in Sahelian hydrology for decades. Knowledge of the mechanisms involved paves the way for practical solutions to adapt agriculture to new environmental conditions.
Etude des fonds coralliens en Nouvelle-Calédonie, dans le cadre du projet PRISTINE, 2013.

Effectiveness of marine reserves compromised by proximity to humans

The environmental benefits of marine reserves located near human populations are limited. This was demonstrated by researchers from the University of Montpellier, IRD and the University of New Caledonia, in conjunction with CNRS, as they studied 1,800 coral reefs, 106 of which were located in 20...
pollution-par-les-plastiques

Plastic in the Saigon River

While the plastic pollution of the oceans is widely covered in the media, freshwater pollution has a lower profile. For the first time, a recent study highlights the high level of micro and macro-plastic pollution of a tropical river running through a developing megalopolis.
The height of waves must be taken into account in rising sea levels on the coast.

Waves disrupt sea levels

Research by ocean and coastline experts shows the hitherto unrecognised influence of waves on the sea level on the coast. Their contribution to overwash is at least equivalent to that of sea level rise linked to melting ice and ocean warming.

Cultivating land for carbon

Soils from cultivated areas in tropical regions constitute largely underused carbon sinks. Increasing carbon stocks in soil has become critical to mitigate the effects of climate change but also increase soil fertility. What are the options?
Cowpea roots bear nodules which contain nitrogen-fixing bacteria.

Lipids that boost symbiosis

Certain legumes form a symbiotic relationship with bacteria! Tucked into their roots, these bacteria increase the crop yield of these plants. These bacteria, capable of producing lipid molecules known as hopanoids, therefore seem to provide a distinct advantage.
dechets-plastiques

Variability and convergence at the heart of the oceans

While gigantic eddies trap floating particles at the heart of each ocean basin in subtropical regions, other currents link the Southern Indian Ocean to the South Pacific. Stable connection over 8,000 km!