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[交流]
【交流】關(guān)于森林遺傳多樣性,幫忙翻譯!
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Forest genetic diversity Forest genetic diversity is the pool of inherent differences among individuals of forest species. Forest tree species have many characteristics that may uniquely situate them to withstand the effects of human induced environmental changes. Paleoecological evidence has demonstrated that the geographic ranges of forest tree species have expanded and contracted several times since the last glacial epoch in response to environmental changes. These range fluctuations have been accomplished without any apparent loss of genetic diversity. Furthermore, phylogeographic studies indicate that gene lineages originating from separate glacial refugia have maintained sufficient genetic variation to allow them to adapt to novel habitats as the species expanded their ranges following glacial retreat. It is sometimes overlooked that habitat heterogeneity (elevation, slope, aspect, moisture etc.) in the refugia may have preserved adaptive genetic variation that has given rise to the local adaptation that we see in present-day tree populations. The maintenance of genetic diversity in the face of extensive habitat fragmentation is also a special concern for modern landscapes. Forest trees may, however, be buffered from the adverse effects of such fragmented landscapes. 請森林生態(tài)方面的牛人幫忙翻譯!謝謝!30幣重金答謝! |
» 搶金幣啦!回帖就可以得到:
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| 森林遺傳多樣性是森林物種個體間遺傳變異的基因庫。森林樹種所具有的許多特點,是唯一能使其承受人類帶來的對自然環(huán)境的改變。古生態(tài)研究跡象表明,自冰河世紀(jì)之后,森林樹種在地理分布上已經(jīng)擴張或收縮了好幾次。在這些地理分布變化之后,并沒有出現(xiàn)遺傳多樣性的減少。此外,種族地理學(xué)研究表明,基因譜系的起源也來自不同的冰川期生物種遺區(qū),并且產(chǎn)生了遺傳變異,使得物種能夠適應(yīng)冰川期之后擴張的新的棲息地。 |
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