【科学60秒】浮游植物逃生记_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】浮游植物逃生记

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Plants, for the most part, don’t flee from predators.
But some primitive marine plants are breaking the rules. Marine scientists at the University of Rhode Island School of Oceanography recently discovered a species of phytoplankton that actively avoids being eaten.
The scientists observed that the phytoplankton, called Heterosigma akashiwo, swam away from zooplankton, its natural predator, yet remained undaunted by the presence of predators with an appetite for other things.
What’s more, when the scientists provided an area that the predators couldn’t tolerate - sort of a safe haven if you will - the phytoplankton took refuge in that location. They also avoided empty water that had previously contained predators, leading researchers to believe they’re responding to some sort of chemical signal. The discovery is published in the journal PLoS ONE.
It was already known that phytoplankton could move toward light and food, but this is the first time they’ve been known literally to go out of their way to avoid being a meal themselves.