Pacific Science Volume 25, Number 2, 1971

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Pacific Science is a quarterly publication devoted to the biological and physical sciences of the Pacific Region.


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    The Zoogeographic Relationships of Fanning Island Inshore Fishes
    (University of Hawai'i Press, 1971-04) Gosline, William A.
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    The Littoral Marine Molluscs of Fanning Island
    (University of Hawai'i Press, 1971-04) Kay, E.A.
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    Ecologic Observations on an Estuarine Environment at Fanning Atoll
    (University of Hawai'i Press, 1971-04) Guinther, Eric B.
    Salinity variations observed in an inlet and tidal flat on Fanning Atoll ranged from 7.8 to 42.3 %. Water temperatures varied from 25.1 C to 39.70 C. Daytime oxygen concentrations indicated that water at all stations was supersaturated. There are numerous estuaries on Fanning. Although distinct physical regions may be recognized within the estuaries, the distribution of organisms over these regions was found not to be comparable from estuary to estuary. Most of the fauna of the estuarine environment on atolls appears to be derived from euryhaline, high intertidal, or supratidal species of the lagoon shore.
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    Sedimentation and Coral Reef Development in Turbid Water: Fanning Lagoon
    (University of Hawai'i Press, 1971-04) Roy, K.J. ; Smith, S.V.
    Lack of light and excessive sediment deposition rates are factors limiting coral reef development. The presence of very turbid water and muddy bottom does not mean, however, that coral growth is prohibited. Fanning Lagoon has a turbid water area (visibility, 2 m) and a clear water area (visibility, 10 to 15 m). Both areas have a muddy bottom. Because of the shallow depth and the light-scattering effect of the suspended CaC03, relative light intensity at the bottom is greater than 5 percent. The cleaning mechanism of the corals is sufficient to handle the deposition of sediment. Live corals cover 62 percent of the clear-water area and 31 percent of the turbid. Reefs in the turbid water are ecologically different from the ones in clear water, but they are still living reefs. Ramose corals make up 55 percent of the individuals in the turbid water and only 10 percent of those in the clear water. This difference is reflected in the structure of the reefs; those in clear water are massive and steep-sided, while those in the turbid water have gentler slopes and are more open with sediment infill. Fanning Lagoon is an example of penecontemporaneous formation of reef and intervening muddy sediment with bathymetric relief never more than 8 m.
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    Note on the Planktonic Primary Production in Fanning Island Lagoon
    (University of Hawai'i Press, 1971-04) Gordon, Donald C Jr. ; Fournier, Robert O. ; Krasnick, George J.
    A single series of representative observations indicates that both the productivity and standing crop of phytoplankton in Fanning Lagoon are much greater than reported in the lagoons of other Pacific atolls. Productivity, as measured by the radiocarbon method, averaged 9.29 mg C/m^3/hr, while chlorophyll a averaged 0.548 µg/liter. Phytoplankton, principally dinoflagellates with some diatoms and coccoid blue-greens, averaged 12.6 X 10^4 cells/liter. The relative richness of this lagoon compared with others appears to be due to the greater availability of nutrients which, in turn, is caused by the unique geographic features of the atoll.
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