偶见种(rare species)

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偶见种(rare species)


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4."Hidden" Species May Be Surprisingly CommonCryptic species animals that appear identical but are genetically quite distant—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.Reports of cryptic species have increased dramatically over the past two decades with the advent of relatively inexpensive DNA sequencing technology. Markus Pfenninger and Klaus Schwenk, of the Goethe-Universitat, in Frankfurt, Germany, analyzed all known data on cryptic animal species and discovered that they are found in equal proportions throughout all major branches of the animal kingdom and occur in equal numbers in all biogeographieal regions.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 be many different cryptic species that have low populations and are highly endangered. " Says Pfenninger. Until the genetic information of all species in at least one taxon is thoroughly studied, no one will know just how many cryptic species exist. "It could be as high as 30%. " Pfenninger says."I'm extremely surprised by their results. " Says Alex Smith of the University of Guelph in Ontario, Canada. "It's a call to arms to keep doing the broad kind of genetic studies that we are doing. "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 taxonomic groups is completed, Pfenninger says researchers will be able to decide how many cryptic species exist throughout the animal kingdom.Examples of cryptic species include the African elephant. A 2001 study found the elephants were actually two genetically distinct, non-interbreeding species, the African bush elephant and the African elephant. The species are currently listed as vulnerable and threatened, respectively, by the World Conservation Union (WCU).The reclassifications are more than an academic exercise. They define populations that have evolved independently of each other and whose genetic differences can have significant consequences. In the early 1900s misidentification of mosquito species based on morphology confused attempts to control malaria in Europe. Ultimately, what was thought to be a single species was actually made up of six sibling species, only three of which transmitted the disease. "The basic unit in biology is always the species, and you have to know what you are dealing with. " Pfenninger says. Much previous research is now no longer used, he says, because it is not clear what species was being studied.Which of the following about the significance of the research on cryptic species is NOT true?A.The results of the research can help the development of many other research areas.B.The results of the research can help the development of biodiversity estimates.C.The results of the research can help our understanding of infectious disease evolution.D.The results of the research can help our understanding of "survival of the fittest. "

更多“偶见种(rare species)”相关问题
  • 第1题:

    What is the root cause of desertification?

    A.poor farming
    B.overpopulation
    C.radical climate change
    D.disappearance of rare plant species

    答案:A
    解析:

  • 第2题:

    This rare bird has become()

    • A、an endangered specie
    • B、endangered species
    • C、endangering species
    • D、an endangered species

    正确答案:D

  • 第3题:

    法瑞学派的群落分类原则是()。

    • A、优势种
    • B、特征种
    • C、建群种
    • D、偶见种

    正确答案:B

  • 第4题:

    建群种(constructive species)


    正确答案: 优势种中的最优者,即盖度最大(重量最大),多度也大的植物种。

  • 第5题:

    优势种(dominant species)


    正确答案: 群落中占优势的种类,它包括群落每层中在数量、体积上最大、对生境影响最大的种类。

  • 第6题:

    单选题
    Which of the following can best summarize Sallon’s Plant Project?
    A

    Discovering new species.

    B

    Protecting rare species.

    C

    Restoring extinct species.

    D

    Reforming existing species.


    正确答案: B
    解析:
    倒数第二段说很多物种已经濒危或即将灭绝,等它们不存在之后再想种植是非常困难的,所以最好在它们灭绝之前保护它们,即保护珍稀物种。

  • 第7题:

    单选题
    数组data[m]为循环队列的存储空间,front为队头指针,rare为队尾指针,则执行入队的操作为()
    A

    rare=rare+1

    B

    rare=(rare+1)%(m-1)

    C

    rare=(rare-1)%m

    D

    rare=(rare+1)%m


    正确答案: D
    解析: 暂无解析

  • 第8题:

    名词解释题
    偶见种(rare species)

    正确答案: 偶尔在群落中出现的物种,称为偶见种。
    解析: 暂无解析

  • 第9题:

    名词解释题
    种(species):

    正确答案: 生物分类学上最基础的单位。它具有遗传特征的稳定性,又具有一定的变异范围,是由一个模式个体为基础,连同一些具有相同性状的个体共同组成的群体。
    解析: 暂无解析

  • 第10题:

    多选题
    Which two demonstrate an “is a” relationship?()
    A

    public interface Person { }  public class Employee extends Person { }

    B

    public interface Shape { }  public class Employee extends Shape { }

    C

    public interface Color { }  public class Employee extends Color { }

    D

    public class Species { }  public class Animal (private Species species;)

    E

    interface Component { }  Class Container implements Component ( Private Component[ ] children;  )


    正确答案: D,B
    解析: 暂无解析

  • 第11题:

    单选题
    Which of the following is NOT mentioned in the last paragraph?
    A

    Biologists began to study new species of turtles for Chinese food markets.

    B

    Biologists discovered a few rare species of turtles as a result of search previously

    C

    Some species of turtles will soon be extinct if they are caught and killed at the present speed.

    D

    Turtles will soon be a target for rare collectors as dear as pearl and diamond.


    正确答案: B
    解析:
    本题是是非题。第六段第一句中有提及选项A,B的内容;第六段第二句中有提及选项C的内容;所以答案为D。

  • 第12题:

    名词解释题
    偶见种或罕见种

    正确答案: 在群落中出现频率很低的种类。
    解析: 暂无解析

  • 第13题:

    This rare bird has become()

    Aan endangered specie

    Bendangered species

    Cendangering species

    Dan endangered species


    D

  • 第14题:

    数组data[m]为循环队列的存储空间,front为队头指针,rare为队尾指针,则执行入队的操作为()

    • A、rare=rare+1
    • B、rare=(rare+1)%(m-1)
    • C、rare=(rare-1)%m
    • D、rare=(rare+1)%m

    正确答案:D

  • 第15题:

    偶见种或罕见种


    正确答案: 在群落中出现频率很低的种类。

  • 第16题:

    偶见种


    正确答案: 偶尔在群落中出现的物种,称为偶见种。

  • 第17题:

    种(species):


    正确答案: 生物分类学上最基础的单位。它具有遗传特征的稳定性,又具有一定的变异范围,是由一个模式个体为基础,连同一些具有相同性状的个体共同组成的群体。

  • 第18题:

    名词解释题
    优势种(dominant species)

    正确答案: 群落中占优势的种类,它包括群落每层中在数量、体积上最大、对生境影响最大的种类。
    解析: 暂无解析

  • 第19题:

    名词解释题
    建群种(constructive species)

    正确答案: 优势种中的最优者,即盖度最大(重量最大),多度也大的植物种。
    解析: 暂无解析

  • 第20题:

    单选题
    This rare bird has become()
    A

    an endangered specie

    B

    endangered species

    C

    endangering species

    D

    an endangered species


    正确答案: B
    解析: 暂无解析

  • 第21题:

    单选题
    法瑞学派的群落分类原则是()。
    A

    优势种

    B

    特征种

    C

    建群种

    D

    偶见种


    正确答案: B
    解析: 暂无解析

  • 第22题:

    名词解释题
    偶见种

    正确答案: 偶然出现,在群落中个体数量很少的植物种。
    解析: 暂无解析

  • 第23题:

    单选题
    Which of the following statements is closest in meaning to the passage you have just heard?
    A

    The new vision of agriculture will support US expansion of power overseas.

    B

    The new vision will enhance public health and social well-being.

    C

    The new vision embraces technologies for the cloning of rare species of wildlife.

    D

    The new vision promotes agriculture as a political, economic, social and environmental force.


    正确答案: B
    解析:
    录音中提到new vision会促进农业的发展,来满足美国以及全球日益扩大人口的需求,此外它还能带来其他的益处,例如enhanced public health等,由此可见new vision会提高公共卫生和社会福祉。
    【录音原文】
    The new vision promotes agriculture as a positive economic, social, and environmental force. It embraces further gains in food and fiber production-gains that will be crucial to meet the needs of an expanding US and global population—but it also provides other benefits, such as enhanced public health, clean water, more diverse wildlife, rural amenities, and social well-being.