Group of ancient (> 2000 years old) megalithic jars at the Plain of Jars in Laos. Accumulation of rainwater and organic debris creates aquatic mesocosms with suitable conditions for a wide range of organisms. The jars are among many sampled to illustrate prospects of examining the oldest man-made mesocosm studied so far. Full open access paper here. Photo credit: Khamla Inkhavilay.

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