RICHARD BROOKS / SCIENCE PHOTO LIBRARY RICHARD BROOKS / SCIENCE PHOTO LIBRARY
Jellyfish in marine lake. The saline waters of this marine lake, found on the Pacific islands of Palau, are sufficiently isolated from the sea that unique species can develop. This lake is meromictic, meaning the waters do not mix and become stratified. As well as the large moon jellyfish (Aurelia aurita) seen here, there are also huge numbers of stingless Mastigias jellyfish. 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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