. Atoll Forschung Bulletin. Korallenriffe und Inseln; Meeresbiologie; Marine Sciences. 162 Einleitung Analyse der Mollusken Verteilung bei Fanning Atoll zeigte einen deutlichen Unterschied in der Zusammensetzung, Artenvielfalt und stehendem Erntegut zwischen der seewärtigen Riffe und die Lagune (Kay, 1971; Kay und Switzer, 1974). Innerhalb der Lagune, Unterschiede zwischen den Muscheln der Lagune Riffdach, Patch, Riffe und die Lagune, wurden auch erkannt, mit Substrat Arten, Wasserchemie und Trübung (Kay und Switzer, 1974). Solche Muster sind von Interesse, weil Sie docum bieten
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. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 162 INTRODUCTION Analysis of molluscan distribution patterns at Fanning Atoll showed a clear distinction in species composition, species diversity, and standing crops between the seaward reefs and the lagoon (Kay, 1971; Kay and Switzer, 1974). Within the lagoon, differences among the mollusks of the lagoon reef flat, patch reefs, and lagoon floor were also detected, associated with substratum types, water chemistry, and turbidity (Kay and Switzer, 1974). Such patterns are of interest because they provide documentation for present and past ecological parameters of atoll reefs and because they are a source of data for both biogeographical and faunistic studies. In this report, patterns of distribu- tion at Canton Atoll are described and are compared with observations from Fanning Atoll. METHODS Mollusks from Canton Atoll were obtained from three series of sediment samples. One sample from the slopes of the seaward reef on the lee of the atoll and six samples from the outer lagoon were obtained by hand retrieval from depths between 6 and 35 m by Dr. J. E. Maragos in September 1973 (M stations, Fig. 41). Nine samples from the inner lagoon were collected by Dr. S. V. Smith from dredge hauls at depths of less than 10 m (CL stations, Fig. 41) in December 1973. Two samples from the outer lagoon and one from a "pond" were provided by Mr. E. B. Guinther (G stations, Fig. 41) in December 1973. Figure 41. Biotic provinces and micromollusk sample sites.. G25. 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 Wildlif
