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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

The Mediterranean Sea is home to some 17,000 native species,

but it's also home to a growing number of non-native species, 756 at last count.

Now, 756 may not sound like a lot compared to 17,000.

But this is not arithmetic.

Bella Galil, a naturalist at the Israel National Center for Biodiversity Studies in Tel Aviv.

Those invasive species have large population, and they rend apart the native food web.

They disturb an already stressed communities.

The invaders she's talking about are central casting for an underwater horror movie.

Take the nomadic jellyfish in huge swarms, 60 miles long, which sent hundreds of

people to Turkish hospitals a few summers back, or a type of pufferfish, extremely poisonous,

that occasionally gets fished out and lands at fish markets by mistake.

Galil says these bad guys, and many others, have invaded the Mediterranean through the ever-widening

Suez Canal.

As the canal grows, so do the number of non-native species.

And it's a dilemma that's not easily addressed.

It's a Humpty Dumpty sort of a problem.

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