Scientific news sheets
28 elements with the selection : 2007
Page 1 : Results 1 to 5 on 28
The complexity of termite symbiotic relationships with fungi could hinder the control strategy against this insect pest
December 2007
Termites are social insects organized into a complex caste system. The African continent harbours one-third of the 2000 species recorded to date and they include about 100 fungus-growing termites. These characteristically establish symbiosis with a higher fungus of the Basidiomycetes class, ...
Sub-Saharan Africa : the population emergency
December 2007
The population of Sub-Saharan Africa is continuing to grow at twice the rate recorded in Latin America and Asia. This exceptional population growth is a major handicap for efforts to achieve the UN’s Millennium Development Objectives (MDO) in most of the countries lying South of the Sahara. With ...
Overgrazing accelerating soil erosion in northern Mexico
November 2007
In the countries of the South, erosion is a process often exacerbated by the high rainfall that affects these regions during the wet season. Recent research conducted in Mexico by the IRD and its partners and continued as an observation system by one of them since the end of the IRD-CENID RASPA ...
Learn moreOvergrazing accelerating soil erosion in northern Mexico
El Niño affected by global warming
November 2007
El Niño climatic and oceanic events, which exert their influence particularly on coastal regions stretching from the South of Ecuador down to central Chile, have occurred with a periodicity of around 2 to 7 years for several thousand years. Many of the secrets of this climatic phenomenon, also ...
Present-day species of piranhas result from a marine incursion into the Amazon Basin
November 2007
The factors that lead to the appearance of new species are still insufficiently understood for a great many animals. However, it is easier to trace back the evolutionary history of those whose biogeographical distribution is well known. This is the case for piranhas for which the whole range of ...
Learn morePresent-day species of piranhas result from a marine incursion into the Amazon Basin