Cyclones also fell rainforests of the ocean

James Woodford - 

Tropical cyclone Yasi not only felled vast numbers of trees in some of Australia's most spectacular and precious rainforest, but its might will have been felt underwater, too.

Yasi will almost certainly have left a trail of destruction across a section of the Great Barrier Reef, hundreds of kilometres long.

For more than a month scientists have watched in alarm as threats to the World-Heritage-listed reef have accumulated.

Since Christmas, freshwater, pollution and nutrients have stressed coral in the southern sections of the reef.

Now category five cyclone Yasi has dealt a blow to reefs off north Queensland.

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