. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ZOOXANTHELLAE IN DIFFERENT HABITATS 353 Symb. A or A + C D Symb. 6 or B + C D Symb. £ or E + C Symb. C only. 12 o> 1 8 o o •5 6 !4 5 8 11 14 17 20 23 26 29 32 35 38 Depth Interval (meters) Figure 6. Occurrences of Symbiodinium A, B, C. and E in tops of colonies of Montastraea fnuiksi living at Cayos Limones. Shallow depth intenaK are m (labeled 4) and m (labeled 5); other depth intervals are 3 m wide on the centers indicated. Samples were scored as containing Svinhiniliiiiiun A. B. C. and/or E. according to
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ZOOXANTHELLAE IN DIFFERENT HABITATS 353 Symb. A or A + C D Symb. 6 or B + C D Symb. £ or E + C Symb. C only. 12 o> 1 8 o o •5 6 !4 5 8 11 14 17 20 23 26 29 32 35 38 Depth Interval (meters) Figure 6. Occurrences of Symbiodinium A, B, C. and E in tops of colonies of Montastraea fnuiksi living at Cayos Limones. Shallow depth intenaK are m (labeled 4) and m (labeled 5); other depth intervals are 3 m wide on the centers indicated. Samples were scored as containing Svinhiniliiiiiun A. B. C. and/or E. according to the key. More samples were analyzed at the ends of the depth range, where more than one taxon of Symbiodinium was observed. between 6 and 11 m at Aguadargana, another nearby off- shore reef (Fig. 1). However, in the shallowest and deepest colonies of M. franksi. different taxa of zooxanthellae were observed. Between 4 and 6 m, colonies contained, in order of decreasing frequency of occurrence, Symbiodinium B, C. A, and E. With the exception of Symbiodinium E in one colony, this distribution of taxa resembles that found in M. annuliiris at similar depths at Aguadargana reef (Rowan and Knowlton. 1995; Rowan et 1997). Samples from four of the six deepest colonies of M. franksi (35-38 m depth) contained Svmbiodinium E only: the other two colonies contained Synibituliniiini C only (Fig. 6). At both the shal- low and deep extremes, colonies of M. franksi were rela- tively small, encrusting forms (< m diameter). To find out if the congeners of M. franksi at Cayos Limones also host Symbiodinium E at their lower depth limits, we sampled the deepest colonies of M. annularis (n = 23) and M. faveolata (n = 5) that we could find. They were not very deep (12-17 m and 13-15 m. respec- tively), and like M. franksi at the same depths, contained Symbiodinium C only (not shown). In our limited sample of corals from two reefs at Bocas del Toro (1-15 m depth), M. franksi was found wit
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