. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 339. Miles Figure 4. An enlargement of a section of the lagoon at Pearl and Henries Atoll (Area portrayed is outlined by the black box in Figure 3). The black areas are the polygons created in Arcview to delineate the surveyed reef area at Pearl and Hermes during 2003. Pearl oysters are represented by white squares. to Species in the field. The P. margaritifera size frequency distribution (Fig. 6) has a single mode. However, immature oyster recruits, or spat (shell length <5 cm), were excluded from the
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 339. Miles Figure 4. An enlargement of a section of the lagoon at Pearl and Henries Atoll (Area portrayed is outlined by the black box in Figure 3). The black areas are the polygons created in Arcview to delineate the surveyed reef area at Pearl and Hermes during 2003. Pearl oysters are represented by white squares. to Species in the field. The P. margaritifera size frequency distribution (Fig. 6) has a single mode. However, immature oyster recruits, or spat (shell length <5 cm), were excluded from the size-frequency data set. The mean shell length of cm found in 2003 is remarkably similar to the mean shell length of cm for the 164 adult pearl oysters measured by Galtsoff (1933), although the distributions have different shapes (Fig. 6). For 419 (40% of total surveyed) pearl oysters observed, data were recorded on substratum type. Within the lagoon, the typical substratum composition consisted of: sand 11% (sd =), coral 13% (sd = ), algae 28% (sd = ), and coral cement 48% (sd = ). The oysters were found in various orientations. In the subset of oysters for which orientation data were collected (n = 624), most were horizontal (53%)). Of the remaining oysters, 32%) were vertical, and 15% were 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 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]
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