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Biostratinomy of ostracode assemblages from a small reef flat in Maunalua Bay, Oahu, Hawaii
Published online by Cambridge University Press: 19 May 2016
Abstract
Comparisons of biotopes based on ternary plots and cluster analyses of living ostracode assemblages with those from subfossil assemblages from a small reef flat show that biostratinomic processes modify the assemblages before they are incorporated into the sediment of the reef flat. Selective preservation changes the assemblages by preferentially preserving robust carapaces over fragile carapaces. The thin-shelled Paradoxostomatidae, which are abundant in the algae-dwelling assemblages, are largely destroyed by biostratinomic processes and are represented by only a few individuals in the subfossil assemblages.
Mixing of algae-dwelling assemblages and sediment-dwelling assemblages results in a lower relative proportion of many species in the subfossil assemblages than in the living assemblages. The Leptocytheridae, which comprise a large portion of the sediment-dwelling fauna, are reduced in relative proportion in the subfossil assemblages as a result of dilution of the sediment-dwelling fauna with an abundant, algae-dwelling fauna.
Transportation of ostracode remains by wave-induced currents removes the patchiness that is characteristic of the biotopes of the living ostracode assemblages but does not completely homogenize the assemblage despite the close spacing of sampling and the small areal extent of the biotopes studied.
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