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Fig. 6. (A) Concentrations of Ca (means ± s.e.m.) in the cells of the oral
ectoderm (OE; n=60, N=6), mesogloea (M; n=37,
N=4), cells of the oral gastrodermis (OG; n=51,
N=5), extrathecal coelenteron (ETC; n=37, N=5),
cells of the aboral gastrodermis (AG; n=34, N=3) and
calicoblastic ectoderm (CE; n=33, N=3). N = number
of polyps, n = number of measurements. Cellular compartments are
represented by black bars and non-cellular compartments by grey bars. Values
labelled with the same letter are significantly different
(P<0.05). (B) Schematic diagram of coral epithelia showing Ca
concentrations, as measured by x-ray microanalysis of freeze-substituted
sections, in the external seawater layer (ESW), oral ectoderm (OE), mesogloea
(M), oral gastrodermis (OG), extrathecal coelenteron (ETC), aboral
gastrodermis (AG) and calicoblastic ectoderm (CE) adjacent to the skeleton
(SK). Bulk seawater concentration (SW) is from Marshall and Clode
(Marshall and Clode, 2003).
(C) Cutaway diagram of a Galaxea fascicularis polyp, sectioned
proximal to the mouth and tentacles, showing the organization of the
extrathecal coelenteron compartments. The skeleton is shown in black. The data
shown in A and summarised in B are from regions such as that shown in the
circle in C.
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