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plankton浮游生物

來源:apple 編輯:apple 時間:2017-12-19
plankton浮游生物
plankton浮游生物
plankton
  Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They drift about lazily with the currents, providing a basic food for many larger animals. Plankton has been described as the equivalent of the grasses that grow on the dry land continents, and the comparison is an appropriate one. In potential food value however,plankton far outweighs that of the land grasses. One scientist has estimated that while grasses of the world produce about 49 billion tons of valuable carbohydrates each year. The sea’s plankton generates more than twice as much.
  Despite its enormous food potential, little effort was made until recently to farm plankton as we farm grasses on land. Now marine scientists have at last begun to study this possibility, especially as the sea’s resources loom even more important as a means of feeding an expanding world population.
  No one yet has seriously suggested that “planktonburgers” may soon become popular around the world. As a possible farmed supplementary food source, however, plankton is gaining considerable interest among marine scientists.
  One type of plankton that seems to have great harvest possibilities is a tiny shrimplike creature called krill. Growing to two or three inches long, krill provide the major food for the giant blue whale, the largest animal ever to inhabit the Earth. Realizing that this whale may grow 100 feet and weigh 150 tons at maturity, it is not surprising that each one devours more than one ton of krill daily.
  Krill swim about just below the surface in huge schools sometimes miles wide, mainly in the cold Antarctic. Because of their pink color, they often appear as a solid reddish mass when viewed from a ship or from the air. Krill are very high in food value. A pound of these crustaceans contains about 460 calories—about the same as shrimp or lobster, to which they are related.
  If the krill can feed such huge creatures as whales, many scientists reason, they must certainly be contenders as new food source for humans.
浮游生物
  在全世界的海洋中散布著幾十億噸的小型植物和動物,稱為浮游生物。這些植物和動物中的大多數對于人眼來說太小了。它們懶洋洋地漂流,為許多較大的動物提供了基本的食物。浮游生物被描述為在陸地上生長的草,這種比喻是合適的。然而,在潛在的食物價值中,浮游生物遠遠超過了陸地草的價值。一位科學家估計,世界上的牧草每年都會產生約49億噸的有價值的碳水化合物。海洋的浮游生物產生了兩倍多。
  盡管有巨大的食物潛力,但直到最近,在我們在陸地上種植草的時候,我們還沒有做出什么努力來種植浮游生物。現在,海洋科學家終于開始研究這種可能性,特別是隨著海洋資源作為喂養不斷擴大的世界人口的手段變得更加重要。
  沒有人認真地提出,“浮游的漢堡”可能很快就會在世界各地流行。然而,作為一種可能的養殖補充食物來源,浮游生物在海洋科學家中引起了相當大的興趣。
  一種似乎有很大收獲可能性的浮游生物是一種叫做磷蝦的微小的蝦類生物。長到兩三英寸長的磷蝦為巨型藍鯨提供了主要食物,它是有史以來居住在地球上的最大的動物。意識到這條鯨魚可能成長100英尺,重達150噸,每天吃一噸以上的磷蝦就不足為奇了。
  磷蝦在大學里的幾英里寬的水面下游動,主要是在寒冷的南極。由于它們的粉紅色,當從船上或從空中觀看時,它們通常顯示為固態的淡紅色塊。磷蝦的食物價值很高。一磅這些甲殼類動物含有大約460卡路里——大約與蝦或龍蝦差不多,與它們有關。
  如果磷蝦能像鯨魚那樣喂養這樣巨大的生物,許多科學家認為,他們肯定是人類的新食物來源。

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