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Fig. 2. Coral colonies can be severely hypoxic habitats at night. The graphs show
the oxygen levels (A) outside and (B) between branches of Acropora
nasuta colonies from dusk to dawn. Values are means ± s.e.m. from
six measurements on three corals in an outdoor tank at Lizard Island Research
Station. Sunset and sunrise are indicated by broken lines. From Nilsson et al.
(Nilsson et al., 2004).