中太平洋海域曾存在未知的鲨鱼品种-凯发k8官网

中太平洋海域曾存在未知的鲨鱼品种
文章来源:未知 文章作者:enread 发布时间:2013-04-07 06:33 字体: [ ] 
(单词翻译:双击或拖选)
the gilbert island reefs in the central pacific were once home to two species of sharks not 1 reported in historic records or contemporary studies. the species were discovered in a new analysis of weapons made from shark teeth and used by 19th century islanders, reported in a study published april 3 in the open access journal plos one by joshua drew from columbia university and colleagues from the field museum of natural history. sharks were culturally important to the gilbertese islanders; historic records indicate a complex ritual(仪式的,例行的) system surrounding shark fishing and making fishing gear and weapons from shark teeth. for the current study, the researchers 2 a collection of 120 of these weapons from the field museum of natural history, including some that resemble clubs, 3, lances, spears and swords. they identified eight species of sharks based on the teeth used in these weapons, two of which have never been reported from these waters, in either historical surveys or contemporary analysis. both these species are currently common in other areas, so while it is possible that these species may still be living undiscovered in the gilberts, it is more likely that the local populations have been driven to 4.
 
"when we looked we found this shadow biodiversity, hints and whispers of what these reefs used to be like. it's our hope that by understanding how reefs used to look we'll be able to come up with conservation strategies to return them to their former vivid splendor(光彩,壮丽)," says drew.
 
according to the study, sharks in these waters play important 5 and cultural roles, and understanding the historical ecological conditions of these reefs is an important first step in evaluating conservation efforts.


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1 bkzzzc     
adv.以前,先前(地)
参考例句:
  • the bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
2 483f1acae53789fbee273a644fdcda80     
v.分析( analyze的过去式和过去分词 );分解;解释;对…进行心理分析
参考例句:
  • the doctors analyzed the blood sample for anemia. 医生们分析了贫血的血样。 来自《简明英汉词典》
  • the young man did not analyze the process of his captivation and enrapturement, for love to him was a mystery and could not be analyzed. 这年轻人没有分析自己蛊惑著迷的过程,因为对他来说,爱是个不可分析的迷。 来自《简明英汉词典》
3 a5734a458d7921e71a33be8691b93cb0     
匕首,短剑( dagger的名词复数 )
参考例句:
  • i will speak daggers to her, but use none. 我要用利剑一样的话刺痛她的心,但绝不是真用利剑。
  • the world lives at daggers drawn in a cold war. 世界在冷战中剑拨弩张。
4 spwzp     
n.熄灭,消亡,消灭,灭绝,绝种
参考例句:
  • the plant is now in danger of extinction.这种植物现在有绝种的危险。
  • the island's way of life is doomed to extinction.这个岛上的生活方式注定要消失。
5 irrxx     
adj.生态的,生态学的
参考例句:
  • the region has been declared an ecological disaster zone.这个地区已经宣布为生态灾难区。
  • each animal has its ecological niche.每种动物都有自己的生态位.
tag标签: shark reefs fishing
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