They then examined each using DNA analysis, and also an electron microscope, to seewhat was living on it.
然后使用DNA分析及电子显微镜对每一块碎片进行了检测,来观查上面有什么生物。
Lots of things were. Altogether, they discovered about 50 species of single-celled plant,animal and bacterial life.
上面确实有很多生物,他们一共发现了大约50种单细胞植物,动物及细菌生命体。
Each bit of debris was, in effect, a tiny ecosystem.
实际上,每块碎片都是一个微型生态系统。
As with many ecosystems, the bottom of the food chain was occupied by things thatphotosynthesise.
与许多生态系统一样,位于生物链底层的是进行光合作用的生物,
These included unicellular algae called diatoms and dinoflagellates, and photosyntheticbacteria known as cyanobacteria.
包括叫做硅藻及鞭毛藻的单细胞藻类以及被称为蓝藻细菌的光合细菌。
Usually, such creatures swim freely in the ocean.
通常情况下,这些生物在海洋中随波逐流,
They therefore have to work hard to stay near the surface, where light for photosynthesisis abundant.
然而它们必须努力停留在海面附近,以获得充足的阳光进行光合作用。
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