The taphonomy of gastropod shell accumulations in large lakes: an example from Lake Tanganyika, Africa

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Abstract

An investigation of shell morphometrics of the prosobranch genus Paramelania from Lake Tanganyika shows striking contrasts between some live and dead populations from identical localities. Living populations and surficial dead shells were collected from 15 sublittoral-profundal localities along the east side of the lake. Interpopulation variability in this endemic gastropod is clinal (N-S) for several shell characters. Intrapopulation variability of dead shell populations frequently exceeds that of live populations. Distinctive morphs may be present in a local dead shell population which are absent in the live population from the same locality. However, the phenodeviant dead shell morphology may occur among live snails elsewhere in the lake. Phenodeviant shells may be encrusted, but are unabraded and show no preferred orientation. A model of biogeographic range fluctuations for particular Paramelania morphs during the Holocene, in concert with lake level fluctuations, can account for the shell assemblages seen on the lake floor today. The complex history of these accumulations suggests that taphonomic admixtures may obscure the interpretation of evolutionary sequences in the lacustrine stratigraphic record. -from Author

Original languageEnglish (US)
Pages (from-to)26-45
Number of pages20
JournalPaleobiology
Volume15
Issue number1
Publication statusPublished - 1989

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ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Ecology, Evolution, Behavior and Systematics
  • Palaeontology
  • Ecology

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