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March 2002Humans are exposed to a wide range of simian immunodeficiency viruses (SIV) by hunting and eating primate bushmeat.
El Niño events do not always occur with the same strength and the same frequency.
Optimal management of fishing zones requires assessment of the stocks potentially available as early as possible into the fishing season, or even before it begins if possible.
Plants resist attack by parasites, bacteria or other agents with a diverse array of defence strategies.
In South America, cassava has a formidable enemy in the form of the sap-feeding mealybug Phenacoccus herreni.