. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 17 Bathymetric map Smoothed depths recorded on transects were contoured to map the bathymetry of Tikehau (Fig. 6). The greatest depth recorded was 38 m in the central northeastern part of the lagoon. The main lagoon basin appears to be a relatively flat area with gentle slopes. Depth histogram The histogram presented on Fig. 7 shows that the general shape of the lagoon is that of a basin with steep walls. Depths between 0 and 15 m represent only 7 % of the total surface of the lagoon S (S = 420 106 square mete

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. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 17 Bathymetric map Smoothed depths recorded on transects were contoured to map the bathymetry of Tikehau (Fig. 6). The greatest depth recorded was 38 m in the central northeastern part of the lagoon. The main lagoon basin appears to be a relatively flat area with gentle slopes. Depth histogram The histogram presented on Fig. 7 shows that the general shape of the lagoon is that of a basin with steep walls. Depths between 0 and 15 m represent only 7 % of the total surface of the lagoon S (S = 420 106 square meters). Other geometric data The mean depth P as well as the total volume V of the lagoon is of great interest for other studies. Mean depth is calculated by computing the mean depth of each transect with mean length and width of each transect. The result is an average depth of P = 25 m. The total volume of the lagoon is calculated by multiplying the total surface of the lagoon by its mean depth. The result is V = 101° cubic meters. The confidence interval of those data is about 5% which meets the requirement for precision of other research. 148°15' pass Tuheiava. 148°05'W Fig. 6 : Contoured depths (in m) in the lagoon of Tikehau, . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Smithsonian Institution. Press; National Research Council (U. S. ). Pacific Science Board; Smithsonian Institution; National Museum of Natural History (U. S. ); United States. Bureau of Sport Fisheries and Wildlife. Washington, D. C. : [Smithsonian Press]