怎麼維持生物多樣性的英語作文
Ecosystem diversity）和景觀多樣性（Landscape diversity）4個層次。遺傳多樣性，也稱為基因多樣性，指廣泛存在於生物體內、物種內及物種間的基因多樣性，常通過測定染色體多態性，各染色體數目、結構及減數分裂行為等來了解。一個物種遺傳變異越豐富，它對環境適應的能力越強。一個物種適應能力越強，它的進化潛力也越大。物種多樣性是指物種水平的生物多樣性，可以從分類學、生物地理學角度對一個地區的物種進行研究，研究物種多樣性的形成、演化、受威脅情況以及保持物種的永續性等。生態系統多樣性主要指生物多樣性，生物群落多樣性和生態過程的多樣性。景觀多樣性是指不同類型的景觀在空間結構、功能機制和時間動態方面的多樣化和變異。
生物多樣性是地球最顯著的特點之一，是人類社會賴以生存和發展的基礎（見下圖）。但是生物多樣性在全球的分布是不均的。有的生物只分布在某一地區，如白鱘只分布在長江幹流和出海口；喙頭蜥只分布在紐西蘭及附近一些島嶼，企鵝分布在南極洲附近，少數可延伸到非洲和南美洲南部;我國特產的金絲猴只分布在川、陝、甘三省南部和湖北神農架的高山上；大熊貓僅分布於四川西北部、甘肅南部、陝西秦嶺南麓，生活在2 000M～3 500M的針葉林、針闊混交林中。
當今世界面臨著人口、資源、環境、糧食、能源5大危機，這些危機的解決都與地球上的生物多樣性有著密切關系。發達國家以其雄厚的經濟實力和先進的科學技術除了開發本國資源外，還大肆掠奪發展中國家的資源；發展中國家由於人口膨脹和經濟壓力，缺乏對生物多樣性保護的意識，造成許多生物多樣性丟失；在糧食作物和畜牧業方面，由於追求高產、優質，導致品種單一化，許多具有某方面優良性狀的動植物被淘汰，遺傳多樣性急劇減少。在過去的2億年中，每100年自然界有4種植物，90種脊椎動物從地球上消失，隨著人類活動的加劇和技術手段的更新，開發和利用生物資源的效率大大提高，物種滅絕的速度也大為增高，20世紀每2年就有一個物種滅絕。過去的物種滅絕大都是自然災害造成的，當代則多是由人為破壞造成的，許多物種尚未被認識，未被定名就消失了，大量的基因丟失了，生態系統面積銳減。如果不立即採取有效措施,人類固有的生活方式就難以維持，子孫後代的正常生活也無法維持。中國是生物多樣性最豐富的國家之一，同時又是生物多樣性受到最嚴重威脅的國家之一。在《瀕危野生動植物種國際貿易公約》（CITES）中列出的640種世界瀕危物種中，中國156種榜上有名，佔24.4%，形勢十分嚴峻。因此，生物多樣性的研究、保護和持續、合理地利用急待加強，刻不容緩。
保護生物多樣性是保護自然，保護地球的一個重要組成部分。美國的《我們被掠奪的星球》（Our Plundered Planet）一書中提出「地球上不能沒有森林、草地、土壤、水分和動物，
❷ 求生物多樣性的英語作文
HELLO！！！！ I FACK YOU FAMILY
❸ 急求一篇關於生物多樣性減少的英語作文
http://www.pc.vccs.e/biology-labmanual/lab15animals/animaldiversity.htm這裡面來有.! http://biog-101-104.bio.cornell.e/BIOG101_104/tutorials/animals.html一所源大學對生物多樣性的研究
❹ 關於生物多樣性的英語作文
animals have no place in the 21st century. Some people think that preventing these wild animals from dying out is a waste of resource. To what extent do you agree or disagree with this opinion.
Biological diversity has never been so threatened as it is today as a result of the process of human civilization. The various forms of pressure created by human activity have destroyed natural balance, led to the deterioration of natural habitats, genetic erosion and the rarity, even disappearance, of a number of plant and animal species.
As the pace of civilization accelerates, more people, taking more space, needing to use more natural resources, engaging in ever-growing consumption, impose severe deterioration on the habitat of animals. An increasing number of people come to realize that the disappearance of animals will result in serious threat to the equilibrium of ecosystem. Simply put, the extinction of hawks, a rat-eating bird seen in many regions, will result in the rapid propagation of rats. And rats, further, will destroy the prairies and threaten the other animals like gazelles, zebras and others, who live on grass and green lands. The coexistence of animals and human beings creates perfect harmony and brings about the vividness to our planet.
It is hard to imagine what our world would be like without animals. Sociologists also point out that the disappearance of animals can cause social and economic problems. Animal trade, as a supporting sector to the world economy, was very active before. However, the situation is beyond control since animal trade is very profitable and alluring. Many species cannot escape the adversity of being killed.
Certainly, our diet cannot be without meat. There are living stocks, which can provide us with sufficient and nutritious proce. Therefore, we need not to resort to wild animals, especially the endangered ones. To protect animals is to protect our living environment. Every indivial should join efforts to keep the diversity of animals.
❺ 急求有關生物多樣性的英文資料
Biodiversity is the variety and variability of life on Earth. This includes all of the plants and animals that live and grow on the Earth, all of the habitats that they call home, and all of the natural processes of which they are a part. The earth supports an incredible array of biodiversity— Thailand』s tiny bumblebee bat to the ocean』s great blue whale—with plants and animals of all shapes and sizes in between. This fantastic variety of life is found in diverse habitats ranging from the hottest desert to tropical rainforests to the arctic tundra. Biodiversity is essential to every aspect of the way that humans live around the world. Plants and animals provide people with food and medicine, trees play an important role in absorbing greenhouse gases and cleaning the air we breathe, and rivers and watersheds provide the clean water that we drink.
Unfortunately, the earth』s biodiversity is disappearing, with an estimated 1,000 species per year becoming extinct. Conserving biodiversity is especially crucial in developing countries where people』s livelihoods are directly dependent on natural resources such as forests, fisheries and wildlife.
Plants and animals provide people with food and medicine. Forty percent of all prescriptions written today are composed from the natural compounds found in different species. An estimated 80,000 edible plants are found in the world, and one in every three mouthfuls of the food you swallow is prepared from plants pollinated by wild insects and animals. The extinction of each additional species results in the irreversible loss of unique genetic materials, each of which has potential for development of medicines and foods and associated enterprises that create jobs.
While plants and animals keep you well fed and healthy, trees play an important role in absorbing greenhouse gases. Through photosynthesis, trees absorb and store atmospheric carbon, helping to combat global warming and purifying the air we breathe. Forests also control soil erosion and purify water.
As natural systems breakdown, people around the world are forced to find alternative and often more costly ways to maintain adequate supplies of clean water or to deal with increasingly polluted air. The net economic benefits of biodiversity are estimated to be at least $3 trillion per year, or 11 percent of the annual world economic output.
❻ 急求一篇關於生物多樣性減少的英語作文
這是我的一個presentation的講稿 for community ecology 不知道適不適合你，是以一個文章為背景的 the bees are back in town (The Economist on March 7th 2009)
At the end of February, the almond flowers were competing for the pollinators in the orchards of California』s central valley. The flowers are so delicate to attract the pollinators which are mainly honeybees, because of the shortage of honeybees in California. The shortage of the honeybees called colony collapse disorder. The colony collapse disorder is described as a phenomenon that large numbers of honeybees are dead in the winter. The causes of colony collapse disorder are unclear. There are some possible causes of the colony collapse disorder, such as virus, parasites and fungus. A study from Cox-foster et. al. showing that the Israeli acute paralysis virus is closely corresponding to the colony collapse disorder by molecular analysis of pathogen DNA like 16s DNA which are highly conserved. For instance, DNA sequencing and NCBI blast were used to identify the species of pathogen on the honeybees. Beside the Israeli acute paralysis virus, parasitic mites can also lead to the colony collapse disorder. But further study is showing that the origin of the colony collapse disorder is the poor food nutrients.
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