关于保护江豚的ppt.pptx

江豚,你还能微笑多久?
Name :finless porpoise
Living habits :Love alone or in pairs
Language :Sonar
Character :sprightly
Like food:eel(鳗鱼)、weever(鲈鱼)、Protosalanx chinensis(大银鱼)、shrimp、cuttlefish
Distribution : 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
年份
1988
1994
2000
2006
2012
数量(只)
2700
2500
2000
1800
1200
近年长江江豚死亡记录
年份
死亡数据(只)
2008
20
2009
21
2010
19
2011
21
2012
32
The 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
What’s the reason caused us to death
-fishing。
With international population keeps growing, demand for fish resource also keeps increasing .Yangtze river fish resources decrease rapidly. The food has e 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.
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 can’t 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