Hidden Species May Be Surprisingly Common
Cryptic species animals that appear identical but are genetically quite distant一may be much more widespread than previously thought. The findings could have major implications in areas ranging from biodiversity estimates and wildlife management,to our understanding of infectious diseases and evolution.
Scientists had previously speculated that cryptic species were predominantly found in insects and reptiles,and were more likely to occur in tropical rather than temperate regions. Species that are seemingly widespread and abundant could in reality he many different cryptic species that have low populations and are highly endangered, says Henninger. Until the genetic information of all species. in at least one texon is thoroughly studied, no one will know just how many cryptic species exist. It could be as high. as 30%,Pfenninger says
Sampling as many individuals as possible, scientists hope to complete work on all fish and birds in another 5 to 10 years. Once either of these taxonumic groups is completed. Pfenninger says researchers will be able to decide how many cryptic species exist throughout the animal kingdom.
The reclassifications are more than an academic exercise: They define populations that have evolved independently of each other and whom genetic differences that have evolved independently of each other and whose genetic differences can have significant consequences.
1.Which of the following about the significance of the research on cryptic species is NOT true?
B The results of the research can help the development of biodiversity estimates.
D The results of the research can help our understanding of survival of the fittest.
A They occurred in equal numbers in all biogeographical regions
C They were likely to be in tropical rather than temperate regions
3. Do scientists know how many cryptic species exist?
B Yes. they do.
D They will never know the answer.
A The WCU are interbreeding those elephants
C They are two genetically distant species.
体坛英语资讯:Brianti crowned at international womens tennis challenge
体坛英语资讯:Spain coach Del Bosque: Dont rest on your laurels
体坛英语资讯:Estonia stuns Serbia 3-1 in Euro 2012 qualifying
体坛英语资讯:United held to goalless at Sunderland
体坛英语资讯:Guangzhou Asian Games flame lit at Great Wall
体坛英语资讯:Brazil beats Iran 3-0 in soccer friendly
体坛英语资讯:Forlan refuses to rule out move
体坛英语资讯:Brazil beats Ukraine 2-0 in soccer friendly
体坛英语资讯:Buffon expects to return in January
体坛英语资讯:Kuerten confirms tennis match against Agassi
体坛英语资讯:Serena Williams to back to tennis court next week
体坛英语资讯:Nadal claims Japan Open tennis title
体坛英语资讯:Cruzeiro, Atletico-PR draw 0-0 in Brazilian soccer
体坛英语资讯:AC Milan edge Parma thanks to Pirlos goal
体坛英语资讯:Former NBA all-star Francis arrested
体坛英语资讯:Sharapova eliminated at China Open
体坛英语资讯:Corinthians battles to 2-2 draw against Ceara
体坛英语资讯:Clijsters withdraws from China Open
体坛英语资讯:Cielo loses to fellow Brazilian Santos in 50m butterfly
体坛英语资讯:Petrova romps past local wildcard in China Open first round
体坛英语资讯:Atletico-PR beat Vitoria 1-0
体坛英语资讯:Netherlands coach Van Marwijk: Nigel de Jong went too far
体坛英语资讯:Injury likely to sideline Rooney up to 3 weeks
体坛英语资讯:Olympic Park to be renamed after Queen Elizabeth in 2013
体坛英语资讯:Cruzeiro beats Fluminense 1-0, assumes leadership
体坛英语资讯:Netherlands beat Moldova in Euro 2012 qualifier
体坛英语资讯:Injuries affect Del Bosque plans
体坛英语资讯:Uganda renders big reward to double Commonwealth gold winner Kipsiro
体坛英语资讯:Michael Ballack postpones comeback
体坛英语资讯:Clijsters to skip China Open
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |