关于保护江豚的ppt.ppt

江豚，你还能微江豚，你还能微笑多久？笑多久？Name:finless porpoiseLiving habits:Love alone or in pairsLanguage:Sonar Character:sprightlyLike food:eel(鳗鱼)、weever(鲈鱼)、Protosalanx chinensis(大银鱼)、shrimp、cuttlefishlDistribution:Western Pacific Ocean,India ocean,the sea of Japan and the Chinese coastal tropical to warm temperate waters,Including the Yangtze River Basin Chinese长江江豚历年数量长江江豚历年数量年份19881994200020062012数量（只）27002500200018001200近年长江江豚死亡记录近年长江江豚死亡记录年份死亡数据（只）200820200921201019201121201232The level of protection;Listed as VU(易危）by the World Conservation Union Red list.Yangtze finless porpoise is known as a living fossil and giant panda ecological water of Yangtze river is a protected second class animal in the country.Below we use date to find out the number of the Yangtze finless.So far the number of finless porpoise has has been less than 1000 heads are plunged at an annual rate of 5%Finless porpoises are facing threats still exist,change of water environment Whats the reason caused us to death1.Over-fishing。With international population keeps growing,demand for fish resource also keeps increasing.Yangtze river fish resources decrease rapidly.The food has become less and less for them that feed on fish.For this reason,many of the finless porpoise have to shoal to search for food.Increasing the risk of stranded.We can see this news from TV in recent years.2.Water contamination in the Yangtze River There are many pollution sources along the Yangtze Lake.The factories release toxic chemical substance which caused creatures in the Yangtze Lake decreasing.It damages the cowfish natural habitat.In the food chain,fish and shrimp eat nails.Then cowfish eats fish and shrimp.Once fish or shrimp or nails are decreasing,the other species cant survive well.Citizen in big city are drawn to shrimp these years,this maybe damage the food chain.三：螺旋桨随着长江“黄金水道”的不断开发，长江流域上的船只也越来越多。而靠螺旋桨开动的船只上的螺旋桨成为了“江豚杀手”，大家都知道江豚是靠声呐通讯和生存的动物，而螺旋桨发出的噪声干扰了江豚的声呐系统，导致江豚应为接触螺旋桨而死亡如何对长江江豚进行保护我们知道的理论知识太多了，在江豚命运的面前这些建议显得那样苍白无力。但是我们真正了解它们吗？关心它们未来的命运吗？可能在不久的将来，将会出现一条长江江豚已经灭绝的新闻时，我们才会将我们的同情的目光投向它们，为它们的灭绝而感到痛惜。我只是希望现在在我们还能看到它们的时候多关注下它们，关心下这群天生就带着微笑的小家伙们。THE END!