. The ecology of deep and shallow coral reefs : results of a workshop on coral reef ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983. Coral reef ecology. FIGURE 1. Mean numbers of fishes observed on different types of reefs. All 5 guilds are included in total fishes. Species included in these guilds are listed in Appendix Table 1. The A reefs (open squares) are comprised of cinderblocks and rubble, the B reefs (closed squares) are built of cinderblocks only, and the C reefs (stars) are made of rubble only. For purposes of illustration, error bars ar
. The ecology of deep and shallow coral reefs : results of a workshop on coral reef ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983. Coral reef ecology. FIGURE 1. Mean numbers of fishes observed on different types of reefs. All 5 guilds are included in total fishes. Species included in these guilds are listed in Appendix Table 1. The A reefs (open squares) are comprised of cinderblocks and rubble, the B reefs (closed squares) are built of cinderblocks only, and the C reefs (stars) are made of rubble only. For purposes of illustration, error bars are omitted here, but they are included in Reaka, 1981, 1983. INVERTEBRATE- EATERS. July Aug Sep Oct Nov Dec Jan '80 CENSUS DATE '81 required for full colonization of the new rubble habitat by invertebrates (Reaka, 1981, 1983). In all guilds, fishes on the C reefs generally were smaller than those on the cinderblock reefs (Wolf, Bermingham, et a]_., unpub. data). The data in Figure 1 sug- gest that reefs with habitat for invertebrates (A) generally were characterized by higher numbers of fishes than reefs without habitat for inverte- brates (B). Specifically, the number of invertebrate-eaters per reef was significantly higher on A reefs than on B reefs in August and October, and the data showed a strong tendency in that direction in November (Mann Whitney U tests; p< , p<, and p<, respectively). In addition, the total numbers of invertebrate- eaters per census on the 5 type A reefs were consistently higher than those recorded on the 5 type B reefs for the 6 month interval (Wilcoxon matched-pairs signed-ranks test, p <). Population levels of inver- tebrates may be affected by invertebrate-eaters that prey upon reef residents, and by planktivorous fishes that eat invertebrate larvae swimming near or settling on the reef. The total numbers of inverte- brate-eating fishes per census on the 5 type A reefs were consistently higher than those on the 5 type C
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