Invasive Alien Species: الأنواع الغازية التي توءثر سلبا و التي ادخلت الي البيئة و اثرها – امثلة - water hyacinth (Eichhornia crassipes), water fern Azolla filiculoides , the exotic freshwater crayfish (Procambarus clarkia), red palm weevil and avian flu their estimated damage may cost the country over one billion Egyptian Pounds (LE). Invasive alien species continue to be a major threat to all types of ecosystems and species in Egypt. There are no signs of reduction of this pressure on biodiversity, and there are indications that it is increasing. A famous example is the detrimental effect of the introduction of water hyacinth (Eichhornia crassipes) in the River Nile and the networks of irrigation and drainage canals throughout the country. Another example is the introduction of the water fern Azolla filiculoides to be used as a biological fertilizer in rice fields but it inadvertently has escapted into water courses where it seems to be wiping out a number of other native hydrophytes (e.g. Lemna spp. And Spirodela spp;). Similarly, the exotic freshwater crayfish (Procambarus clarkia) introduced in agriculture basins found its way into major water channels where it became a serious pest to commercial fish and to biodiversity in general. The recent non-intentional introduction of red palm weevil and avian flu are other good examples of invasive species, their estimated damage may cost the country over one billion Egyptian Pounds (LE) . source: NBSAP -Egypt - 1.4: Reduce the direct pressures on biodiversity 1.4.1: Biosecurity and invasive alien species (Cartagena protocol-GMOs & Biotechnology)
Posted on: Mon, 25 Aug 2014 05:15:35 +0000
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