怎么维持生物多样性的英语作文
Ecosystem diversity）和景观多样性（Landscape diversity）4个层次。遗传多样性，也称为基因多样性，指广泛存在于生物体内、物种内及物种间的基因多样性，常通过测定染色体多态性，各染色体数目、结构及减数分裂行为等来了解。一个物种遗传变异越丰富，它对环境适应的能力越强。一个物种适应能力越强，它的进化潜力也越大。物种多样性是指物种水平的生物多样性，可以从分类学、生物地理学角度对一个地区的物种进行研究，研究物种多样性的形成、演化、受威胁情况以及保持物种的永续性等。生态系统多样性主要指生物多样性，生物群落多样性和生态过程的多样性。景观多样性是指不同类型的景观在空间结构、功能机制和时间动态方面的多样化和变异。
生物多样性是地球最显著的特点之一，是人类社会赖以生存和发展的基础（见下图）。但是生物多样性在全球的分布是不均的。有的生物只分布在某一地区，如白鲟只分布在长江干流和出海口；喙头蜥只分布在新西兰及附近一些岛屿，企鹅分布在南极洲附近，少数可延伸到非洲和南美洲南部;我国特产的金丝猴只分布在川、陕、甘三省南部和湖北神农架的高山上；大熊猫仅分布于四川西北部、甘肃南部、陕西秦岭南麓，生活在2 000M～3 500M的针叶林、针阔混交林中。
当今世界面临着人口、资源、环境、粮食、能源5大危机，这些危机的解决都与地球上的生物多样性有着密切关系。发达国家以其雄厚的经济实力和先进的科学技术除了开发本国资源外，还大肆掠夺发展中国家的资源；发展中国家由于人口膨胀和经济压力，缺乏对生物多样性保护的意识，造成许多生物多样性丢失；在粮食作物和畜牧业方面，由于追求高产、优质，导致品种单一化，许多具有某方面优良性状的动植物被淘汰，遗传多样性急剧减少。在过去的2亿年中，每100年自然界有4种植物，90种脊椎动物从地球上消失，随着人类活动的加剧和技术手段的更新，开发和利用生物资源的效率大大提高，物种灭绝的速度也大为增高，20世纪每2年就有一个物种灭绝。过去的物种灭绝大都是自然灾害造成的，当代则多是由人为破坏造成的，许多物种尚未被认识，未被定名就消失了，大量的基因丢失了，生态系统面积锐减。如果不立即采取有效措施,人类固有的生活方式就难以维持，子孙后代的正常生活也无法维持。中国是生物多样性最丰富的国家之一，同时又是生物多样性受到最严重威胁的国家之一。在《濒危野生动植物种国际贸易公约》（CITES）中列出的640种世界濒危物种中，中国156种榜上有名，占24.4%，形势十分严峻。因此，生物多样性的研究、保护和持续、合理地利用急待加强，刻不容缓。
保护生物多样性是保护自然，保护地球的一个重要组成部分。美国的《我们被掠夺的星球》（Our Plundered Planet）一书中提出“地球上不能没有森林、草地、土壤、水分和动物，
❷ 求生物多样性的英语作文
HELLO！！！！ I FACK YOU FAMILY
❸ 急求一篇关于生物多样性减少的英语作文
http://www.pc.vccs.e/biology-labmanual/lab15animals/animaldiversity.htm这里面来有.! http://biog-101-104.bio.cornell.e/BIOG101_104/tutorials/animals.html一所源大学对生物多样性的研究
❹ 关于生物多样性的英语作文
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 急求有关生物多样性的英文资料
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 急求一篇关于生物多样性减少的英语作文
这是我的一个presentation的讲稿 for community ecology 不知道适不适合你，是以一个文章为背景的 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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