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The reading and lecture both discuss the methods to address the decline of an endangered plant species--Torreya. The author of the reading paragraphs gives credence to the claim that the three ways, including reestablish Torreya in the same location, replant it to a totally different site, or preserve it in research centers, are sufficient. He or she provides proofs to support the feasibility of the means. However, the speaker casts significant doubts on this assertion by putting forward dramatically adverse evidence from the following aspects.
For one thing, the speaker is against the reestablishing suggestion because, as relative data show, the microclimate in which Torreya survives has been noticeably changed, for which reason it would be impossible for the plant to grow there any more. According to the lecture, this tragically change may due to either the global warming or the drainage of water in that area. Either of these reasons could exert influence on the whole area, and thus damage the microclimate which is crucial to the growth of Torreya.
For another, the speaker concerns about the consequence of replanting Torreya to another location. He or she cites an example to elaborate this point. Scientists used to move another plant to a site which is not its original habitat. Unfortunately, this plant spread with such a terrific speed that it killed several other species in that area which were endangered ones themselves. In accordance with this instance, the outcomes of moving can be unpredictable.
Also, the speaker refutes the author’s suggestion of preserve Torreya in research centers, because the labs are lack of the diversity of population which is essential to the plant's resistance to diseases. In another word, to develop the ability to resist certain diseases, is it required to obtain a large genetic diverse, which is impossible in labs. This dearth, in the long term, can be fatal to Torreya.
For all of the reasons above, the speaker in the lecture disagrees strongly with the suggestions listed in the article. Although the proofs the author raises are seemingly forceful, the evidence given by the speaker is also convincing. |
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发表于 2012-7-18 17:16:16
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