This articulo is por Wynne Parry Date: 20 October 2010 and is reproduced verbatim from link
They [jellyfish] sting, even kill, swimmers. They block the cooling systems of power plants. They clog fishing nets and kill penned salmon.
In reciente years, reports of havoc caused por swarms of jellyfish have inspired speculation that these simple, otherworldly creatures are capitalizing on changes we have brought to ocean ecosystems.
Scientists are finding we could be jellyfish's potential benefactors. Overfishing relieves them of competition and predators. Nutrient-rich pollution can cause phytoplankton...