. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 27 Considering the total living biomass, the primary producers largely dominate with about 60% of the total organic matter. They are sea weeds such as Halimeda or Caulerpa belonging to several species, but they may also be Phanerogams Halophila ovalis. (the sole species encountered in this lagoon). Trophic structure - results (Fig. 15) The deposit feeders are considered as a unique group. No distinction between the surface deposit feeders and the burrowing deposit feeders is made. They are slightly the best re
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 27 Considering the total living biomass, the primary producers largely dominate with about 60% of the total organic matter. They are sea weeds such as Halimeda or Caulerpa belonging to several species, but they may also be Phanerogams Halophila ovalis. (the sole species encountered in this lagoon). Trophic structure - results (Fig. 15) The deposit feeders are considered as a unique group. No distinction between the surface deposit feeders and the burrowing deposit feeders is made. They are slightly the best represented with 46% of AOM, but it must be emphasized that they belong to the endofauna (except the Holothuroid Halodeima atra). 2-, g AFDW TROPHIC STRUCTURE E9 Epifauna â Endofauna. Fig. 15: Trophic structure of zoobenthos in sediments (SW : Sea weeds; DF: Deposit-feeders ; SF: Suspension -feeders; CR: Carnivorous). The suspension feeders stand in the same order of magnitude with 42% of AOM. Most of them belong to the same epifauna as Sponges do, but also some molluscs such as the bivalves Pinna are found. The carnivores are the least represented with only 12% of AOM. They are collected in the epifauna (Molluscs as Strombus spp. or Nassarius spp.) as well as in the endofauna (some Crustaceans and Polychaeta). The deposit feeders are under estimated because the mud shrimps, or the Cardiidae for example, are not taken in account by the sampling method. Discussion: A first biocenotic survey carried out by Faure and Laboute (1984) concluded from the study of the coral species distribution that the whole lagoon belongs to a sole community inside which the species distribution depends on geomorphological or physical factors. The study of the fish community by Morize et ah (1990) leads to the same finding: there is only one fish community in the lagoon, but its observed structures (which varies in space and biomass) are greatly heterogenous without any evident explicative factor. The
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