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SIZE-FREQUENCY DISTRIBUTIONS IN DECAPOD CRUSTACEA—THE QUICK, THE DEAD, AND THE CAST-OFFS

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ABSTRACT A consideration of size-frequency distributions of fossil trilobite assemblages indicated that accumulated exuviae will have a different size-frequency distribution than the living population from which they were derived. This concept was examined in more detail for a population model of an extant crab species, using published data on molt increment and intermolt period, and making assumptions on mortality rates. The size-frequency distribution for living crabs resembles a normal curve (except for high abundance in very small size classes). The size-frequency distribution for corpses, exuviae, or combinations of these two, all show a steady decline with size. Very different mortality assumptions were applied to the model and the conclusion regarding exuviae was found to be robust. Thus, the size-frequency distributions of fossil arthropod assemblages, or of exuviae of living species, cannot be expected to resemble living population structures.

10.1163/193724090X00203
/content/journals/10.1163/193724090x00203
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/content/journals/10.1163/193724090x00203
2017-07-24

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