Les lichens se propagent sur les pierres du Machu-Pichu

Autrefois enneig�, le Machu-Pichu rev�t aujourd'hui des couleurs allant du vert au gris et ce, gucci handbags � cause du changement climatique. Les lichens croissent et se r�pandent sur les parois de pierre des murs de cette cit� Inca du XVi�me si�cle en changeant notamment son apparence. La prolif�ration de ces plantes envahissantes s�me l'inqui�tude chez les personnes en charge de la pr�servation du patrimoine du P�rou ainsi que chez les arch�ologues. On a r�pertori� quarante-sept sortes de lichens et de mousses sur les roches de granit composant les constructions de cette citadelle situ�e � 2,400 m�tres d'altitude au coeur des Andes orientales. Un appel a �t� lanc� afin d'obtenir une consultation avec un groupe de gens de l'Unesco sp�cialis�s dans ce domaine pour contrer cette propagation lv handbags des lichens qui s'est accentu�e ces derni�res ann�es. La pluie, le vent alli�s � l'humidit� des lieux ainsi qu'� l'affluence de gens sur le site, soit d'environ 2,500 visiteurs quotidiennement, constituent des facteurs de multiplication de ces plantes ind�sirables. Burberry handbags Le changement de climat contribue, d'autre part, � accro�tre l'endurance des lichens. Le site de Machu-Pichu fut class� en juin comme patrimoine mondial sous haute surveillance. Tweet Aleph   544   0   29/08/2011

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