What Kinds of Organisms Have Lived in a Lake? DNA Tells Us!

Cinthya Soledad Manjarrez-Rangel, María Cristina Del Rincón-Castro, E. Piovano, G. Zanor
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Abstract

There are many organisms living in lakes, for example, fish, aquatic plants, microalgae, and bacteria. But have you wondered what organisms have inhabited a lake throughout its history? Are there any species that are no longer found in the lake today? Has the ecosystem changed over time? When they die, most lake organisms leave their remains (pollen, shells, fossils, and DNA). Remains are preserved for many years in the sediments deposited at the lake bottom. Scientists are using an exciting technology that identifies organisms from DNA extracted from sediments that are over 100 years old. In this article, we will tell you how DNA is preserved in sediments at the bottom of lakes and how it is used to find out which organisms were present in the past and which are still living in a lake today.
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湖中生活过哪些生物?DNA 告诉我们
湖泊中生活着许多生物,例如鱼类、水生植物、微藻和细菌。但您是否想过,在一个湖泊的历史长河中,曾经栖息过哪些生物?湖中是否有如今已不复存在的物种?生态系统是否随着时间的推移发生了变化?大多数湖泊生物死后都会留下遗骸(花粉、贝壳、化石和 DNA)。遗骸在湖底沉积物中保存多年。科学家们正在使用一种令人兴奋的技术,从 100 多年前的沉积物中提取 DNA 来识别生物。在本文中,我们将告诉您 DNA 是如何保存在湖底沉积物中的,以及如何利用它来找出哪些生物在过去曾存在过,以及哪些生物现在仍生活在湖中。
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