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Fig. 1. Coral reef at Lizard Island, Great Barrier Reef, Australia. This picture
depicts daytime behaviour of damsefishes (here mainly represented by the
genera Pomacentrus and Chromis) hovering above a colony of
Acropora nasuta. At night, these fishes shelter between branches in
the coral, a microhabitat that can be severely hypoxic. Photo by G. E.
Nilsson.