. Die biologische Bulletin. Biologie; Zoologie; Biologie; Meeresbiologie. poröse ecomorph NORMOXIA HYPEROXIA B 250 -, 200-Lc'c • "r. : - "•:, F': 1 150 - ICH FRAGE: E I G 100-o 1 50-n-| 1/. mordax ecomorph NORMOXIA HYPEROXIA Abbildung 4. Preise der Sauerstoffverbrauch in coloniesofStylophorapistillata unter 20.0-21.2 kPa normoxia (O2) und 45.4-46.7 kPa hyperoxia (O2). (A) In die HYDRODYNAMISCH poröse ecomorph (n=2), durchschnittlichen Kolonie Protein wurde 369 Mg. (B) in der mordax ecomorph (n=3), mittlere gesamte Kolonie Protein wurde 586 mg senkrechten Linien zeigen ± 1 Standardfehler. Fotografien von J.-P.

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. porous ecomorph NORMOXIA HYPEROXIA B 250- , _ 200 - Lc 'c • "r . : -' •:, f': 1 150- I Q. E I g 100- o 1 50- n - | 1 /. mordax ecomorph NORMOXIA HYPEROXIA Figure 4. Rates of oxygen consumption in coloniesofStylophorapistillata under normoxia(20.0-21.2 kPa O2) and hyperoxia (45.4-46.7 kPa O2). (A) In the hydrodynamically porous ecomorph (n = 2), average total colony protein was 369 mg. (B) In the mordax ecomorph (n = 3), mean total colony protein was 586 mg. Vertical lines indicate ± 1 standard error. Photographs by J.-P. Gattuso. semoni and Heteractis crispa, hyperoxia increases the respiratory rate more than in A. pallida. This seems to be related to their much larger size (5 to 10 cm, vs. 0.5 cm diameter) and perhaps to their greater morphological complexity. These factors might increase the boundary layer at the body surface, in the first case, because the thickness of the boundary layer around a cylindrical anemone is related to the square root of its diameter (Vo- gel, 1983). In addition, water flow might be impeded among the numerous pseudotentacles in P. semoni and tentacles covering the oral disc of H. crispa. Such addi- tional roughness elements may also increase eddy cur- rents and increase the residence time of water in the boundary layer. The existence of such a boundary layer under conditions of forced convection is documented by the experiments of Patterson and Sebens (1989), who found that oxygen consumption by specimens ofMetrid- ium senile of about the same size as the Phyllodiscus in the present study increased two- to threefold as current speed increased from s»7to 15 cms '. Therefore, endog- enously produced oxygen (which need not negotiate an external boundary layer) is proportionally more impor- tant to large anemones that experience a larger boundary layer that develops even under well-stirred conditions, than to small anemones. Measurements of oxygen flux in large

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