The progressive invasion of alien species are now one of the major environmental emergencies and are considered by the international scientific community, the second leading cause of biodiversity loss at global scale. The flora and fauna of the planet have evolved over billions of years and the oceans, seas, mountain ranges, deserts and even large rivers have created physical barriers to movement of species, contributing significantly to thegreat biodiversity the planet and the development of animal and plant communities considered typical of particular regions or localities. However, through the influence of man drops the natural barriers that had limited the development of flora and fauna within certain regions and species are coming, either accidentally or intentionally, in places thousands of miles from their original natural habitats ...
In many cases non-native species adapt poorly to their new environment and die out quickly, but other times they survive, reproduce and settle. In some cases, the newcomers settled so well that we do not represent more than just a curiosity from the biological point of view but a real threat,causing serious damage not only to ecosystems but also to agricultural and livestock activities, disrupting the local ecology effects on human healthand serious economic consequences. Non-native species ("alien") that have such a negative impact are known as invasive species.
In the Archipelago of the Pelagie some species have been reported "alien" such as carpentry and Seriola Seriola rivoliana (two species of jack fish),Siganus luridus (rabbit fish), Percnon Gibbesi (crab Atlantic) Cephalopholis taeniops (cernia africana) e la Fistularia commersonii (pesce trombetta).
In the Archipelago of the Pelagie some species have been reported "alien" such as carpentry and Seriola Seriola rivoliana (two species of jack fish),Siganus luridus (rabbit fish), Percnon Gibbesi (crab Atlantic) Cephalopholis taeniops (cernia africana) e la Fistularia commersonii (pesce trombetta).
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