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Thread: "Endangered"?

  1. #1 "Endangered"? 
    Forum Sophomore Elbethil's Avatar
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    What is the official definition of "endangered", anyway? Does it vary from institute to another?


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  3. #2  
    Forum Radioactive Isotope cosmictraveler's Avatar
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    To me it means that a species is about to become extinct if humans don't watch out for its survival.


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  4. #3  
    Forum Professor wallaby's Avatar
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    Wikipedia says:
    An endangered species is a species whose population is so small that it is in danger of becoming extinct.
    Google says:
    To threaten with extinction.
    i'd say the definition is pretty universal.
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  5. #4  
    Forum Sophomore Elbethil's Avatar
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    But how do they define a small population? For example, if an animal's population is, say, 500 - would it be endangered? One with 5000? That was more my point.

    How does the IUCN, for example, figure out which animals are endangered or vulnerable?
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    Forum Radioactive Isotope cosmictraveler's Avatar
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    They take a POLL , or didn't you know!
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  7. #6  
    Forum Professor wallaby's Avatar
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    i would say the would make the desision based apon the origional estimated number amongst the population area.

    it might also be desided by factors such as continuing decrease in population due to factors such as habitat destruction or over hunting.

    to sum it up it's really a number of things.
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  8. #7  
    Forum Radioactive Isotope cosmictraveler's Avatar
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    Abstract: Under the U.S. Endangered Species Act, a species is classified as endangered, threatened, or recovered based on the extent to which its survival is affected by one or more of five subjective factors. A key criticism of the act is that it makes no reference to quantitative or even qualitative parameters of what constitutes "danger of extinction." Without objective standards to guide decisionmakers, classification decisions fall prey to political and social influences. We recommend the development of species-specific, status-determining criteria as a means to rationalize and expedite the listing process and reclassification decisions, independent of the requirement for delisting criteria in recovery plans. Such criteria should (1) clearly define levels of vulnerability, (2) identify gaps in information on life-history parameters, and (3) address uncertainty in existing data. As a case study, we developed preliminary criteria for bowhead whales ( Balaena mysticetus). Thresholds for endangered and threatened status were based on World Conservation Union ( IUCN) Red List criteria and population viability analyses. Our analysis indicates that particular attention must be focused on population structure within the species to appropriately classify the degree to which one or more components of a species are vulnerable to extinction. A similar approach could be used in the classification of other species. According to our application of the IUCN criteria and those developed for similar species by Gerber and DeMaster (1999), the Bering Sea population of bowhead whales should be delisted, whereas the other four populations of bowheads should continue to be considered endangered

    http://scholar.google.com/url?sa=U&q...9.2001.99380.x
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  9. #8  
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    cosmictraveler, good post, thanks.
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  10. #9  
    Forum Radioactive Isotope cosmictraveler's Avatar
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    Glad to have helped. :-D
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  11. #10  
    Forum Sophomore 8873tom's Avatar
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    Quote Originally Posted by Elbethil
    But how do they define a small population? For example, if an animal's population is, say, 500 - would it be endangered? One with 5000? That was more my point.
    I think it would have something to do with the amount of area that the remaining animals of the species cover. For example, 500 Dodo’s spread out over a couple of football pitches have a greater change of reproducing (as thus keeping their species going) than say, the same amount of Dodo’s over 100 football pitches.
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  12. #11  
    Forum Sophomore Elbethil's Avatar
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    Thanks, folks.
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