International consensus on the reality of climate change is now apparent: global warming is ascribable in large part to human activities. It is causing rapid deterioration of the environment and is increasing the threat to biodiversity. However, the mechanisms of its impact are still poorly known, particularly in the aquatic environment. At Cemagref, two researchers, who have been analysing the freshwater fish community over the two last decades, have observed profound changes that are more intense and long-lasting than predicted.

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A research program recently conducted by an IRD team and its partners found new clues for understanding the influence of exotic species on the biodiversity of communities of mycorrhizal fungi and rhizobial soil bacteria. Exotic tree plantations appear to generate, under certain climatic conditions, an abrupt decrease in soil microbial diversity which lead to significant degradation of its fertility.
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Ecosystems are constantly exchanging materials through the movement of air in the atmosphere and water in lakes and rivers. The effects of humans, however, are another major source of connections among ecosystems.
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Ships are inadvertently carrying trillions of stowaways in the water held in their ballast tanks. When the water is pumped out, invasive species could be released into new environments. Disease-causing microbes could also be released, posing a risk to public health, according to an article in Microbiology Today.
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Emissions of carbon dioxide through human activities have a well known impact on the Earth’s climate. What is not so well known is that the absorption of this carbon dioxide by the oceans is causing inexorable acidification of sea water. But what impact is this phenomenon having on marine organisms and ecosystems?
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