. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 10 Priacanthidae (Priancanthus hamrur), and recruits of Pomacentridae and Apogonidae (Table 3). Axis 2 () 10 Natural reef. Axis 1 () ° Caledonie Toho 2 â Caissons * Ricaudy Figure 7. Correspondence analysis of the community structure (projection of the samples) of Caledonie Toho 2, Caissons and Ricaudy fish assemblages. The percentage of the total variance explained by the axes are given. The fish assemblages of the CT2 and the Caissons displayed numerous similarities (Fig. 7). Differences concerned
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 10 Priacanthidae (Priancanthus hamrur), and recruits of Pomacentridae and Apogonidae (Table 3). Axis 2 () 10 Natural reef. Axis 1 () ° Caledonie Toho 2 â Caissons * Ricaudy Figure 7. Correspondence analysis of the community structure (projection of the samples) of Caledonie Toho 2, Caissons and Ricaudy fish assemblages. The percentage of the total variance explained by the axes are given. The fish assemblages of the CT2 and the Caissons displayed numerous similarities (Fig. 7). Differences concerned the Apogonidae that recruited on the wreck and the presence of several large Serranidae and Lutjanidae on the Caissons (Table 3). Fish community structure of the Caissons remained relatively stable during the study, whereas ecological changes affected the CT2 fish community (Fig. 7). Ecological Changes Ecological changes were identified by the correspondence analysis performed on the fish assemblages of the CT2 (Fig. 8). A pioneer assemblage was observed during the first 221 days after scuttling (samples 1 to 12; Fig 8). The recruitment of juveniles and the migration of adults from the Caissons or the surrounding lagoon characterized this phase. Three steps were identified during the first 193 days (samples 1 to 11; Fig. 8). During the first 31 days (samples 1 to 4), large adult fish (Serranidae and Carangidae) coming from the Caissons and recruits of one species of Pomacentridae (Chromis fumed) colonized the wreck (Table 3). The second step took place between 39 and 109 days (samples 5 to 9; Fig. 8). The fish assemblage structure was modified by a massive recruitment of juveniles, mainly Clupeidae, Apogonidae and unidentified Pomacentridae (Table 3). Adults of new pelagic and opportunist species were also censused during this period (Dasyatidae and Carangidae). The third step occurred between 122 and 193 days after scuttling (samples 10 and 11; Fig. 8). During this period,
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