濒危物种“江豚”幻灯片

1、制作人：王祎卓制作人：王祎卓班级：环境科学班级：环境科学12-112-1学院：资源与环境科学学院学院：资源与环境科学学院Acquaintance of The Organism-Finless PorpoiseDistribution and Habitat Finless porpoises are widely distributed in the coastal waters of Asia, from the Persian Gulf, east and north to Central Japan and as far south as the northern coast of J

2、ava and the Strait of Sunda (see map). Finless porpoises are described as a coastal, estuarine or riverine species and they are usually sighted near the coast.Natural History Finless porpoises are slender and have no dorsal fin. In its place along the mid-dorsum is a low dorsal ridge which is covere

3、d by thick denticulated skin. Newborn finless porpoises are mainly black with some grey on the dorsal ridge area. These young porpoises quickly become lighter and after 4 to 6 months attain the uniform light grey colour of adults. Both male and female finless porpoises grow to lengths greater then 1

4、.55 m. Although there is a great deal of variability between populations of finless porpoises, males become sexually mature at 4.5 - 9 years and females at 3-7 years. Finless porpoises are opportunistic feeders, consuming a wide variety of fishes, shrimps and cephalopods throughout their range.Threa

5、ts to the Species The greatest threat to finless porpoise populations is incidental mortality in fishing gear. These animals are taken in a variety of driftnet, gillnet, trap net and trawl net fisheries throughout their range. The extent of bycatch in many areas is not well documented. They are also

6、 caught in rolling hook gear (lines of iron hooks set across the flow of the river) in the Yangtze River, China.Status and Protection Finless porpoises are found yearly throughout their entire range, but in some areas exhibit seasonal movements and changes in local abundance. These changes in local

7、abundance and distribution are not well documented for most regions. Finless porpoises are currently listed in the IUCN Red List of Threatened Species as a Data Deficient species throughout their range, except in China where they are currently listed as Endangered.QuestionnWhat have you learned abou

8、t the knowledge of finless porpoise?Look,how bewitchingly it is smile! As the case stands,Finless Porpoise isnt far away us.And the human have been calling it as subaqueous panda.It ever had all beauteous thingsundefiled water,deliquescent oxygen,plenitudinous food and mild sunshine. But now,in virt

9、ue of starvation and being slew,the quantity of finless porpoise is lessening.It is reported that there is now no more than 1,000 finless porpoise in China and more threateningly,it is still decreasing by the speed of 6%10% per year.Mournfully, we only watch it to death and they will completely vanish from our sight within 15 years if human dont have profound self-examination and take action quickly.Can you see its bursting into tears?Please be sober and think over whether these huma