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Retelling Lesson3 A Window to Ancient Earth Part 3
; Let's turn our attention to your discovery. Tell me how it all happened.
T: All right.It was in 2009, my second visit to Antarctica, There are more than one hundred lakes around Syowa
Station, Idove into one of them, Lake Naga-1ke. Asl went underwater, a fantastic world came into sight. A
great number of green cones were extending from the bottom of the lake. They were made of various mosses.。
algae, and cyanobacteria. Nobody had expected such a green plant community to be spreading underwater,
while a rusty rocky field stretched out on land.
J: What can we learn from this discovery?
T: Actually, most of the lakes around Syowa Station were exposed from under the glaciers about ten thousand years
ago, when the last ice age ended. Over a long period of time, life gradually settled in the lake. But when I dove
into Lake Naga-Ike, I didn't find any predators such as fish or zooplankton. Compared with Lake Naga-Ike.
lakes on Livingston Island in the warmer area of the Antarctic Peninsula have predators like shrimps and
z0oplankton.In short, the ecosystem without predators in Lake Naga-Ike is more primitive than that of the
lakes with predators on Livingston Island.
