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. 2009 Mar 11;4(3):e4703. doi: 10.1371/journal.pone.0004703

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Altermatt et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Typical rock pools on islands in the Tvärminne archipelago in southern Finland. These pools are part of the herein studied Daphnia metacommunity. Rock pools in panel A, B and C are depicted while filled with water; rock pools in panel D and E are depicted while halfway desiccated. The rock pool in panel F is depicted while completely dry. Note that the rock pools are almost free of sediments. The water colour depends on the amount of dissolved humic acid. In the background of A and B, the Baltic Sea is visible. Maximal diameter of each pool: A) 9.2 m, B) 6.9 m, C) 4.3 m, D) 1.3 m, E) 1.2 m, and F) 3 m. Photos B, D and E courtesy of Thomas Zumbrunn.