Credit: RICHARD BROOKS/SCIENCE PHOTO LIBRARY

Caption: Anemones feeding on jellyfish in marine lake. Jellyfish in a marine lake on the Pacific islands of Palau, being drawn by sunlight towards branches on fallen trees covered in anemones which trap and feed on the jellyfish. The saline waters of this marine lake are sufficiently isolated from the sea that unique species can develop. This lake is meromictic, meaning the waters do not mix and become stratified. Huge numbers of stingless Mastigias jellyfish (seen here) migrate around the lake following the sunlight. The unique conditions arise because the connection to the surrounding ocean is through channels in the limestone rock, leading to little exchange of animal life.

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