七大自然奇迹现象 7 Phenomenal Wonders

4、赤潮 Red Tides


赤潮

　　赤潮也被称为藻花(algal blooms)，是指大量有色单细胞水藻繁殖涌入近海，使整个近海海面变成血红色。虽然赤潮中一些水藻无害，但是许多水藻形成赤潮后会增加海水有毒物质，导致鱼类、鸟类和哺乳动物的大量死亡，同时人类也会间接地遭受赤潮危机，比如海洋生态环境的破坏，对经济等领域造成的打击等。

Red tides are also known as algal blooms - sudden influxes of massive amounts of colored single-cell algae that can convert entire areas of an ocean or beach into a blood red color. While some of these can be relatively harmless, others can be harbingers of deadly toxins that cause the deaths of fish, birds and marine mammals. In some cases, even humans have been harmed by red tides though no human exposure are known to have been fatal. While they can be fatal, the constituent phytoplankton in ride tides are not harmful in small numbers.