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Morphologic and molecular diversity of the foraminiferal genus Globocassidulina in Admiralty Bay, King George Island

Majewski, Wojciech ; Pawlowski, Jan

In: Antarctic Science, 2010, vol. 22, no. 3, p. 271-281

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    Title
    • Morphologic and molecular diversity of the foraminiferal genus Globocassidulina in Admiralty Bay, King George Island
    Author
    • Majewski, Wojciech. Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, 00-818 Warszawa, Poland
    • Pawlowski, Jan. Department of Zoology and Animal Biology, University of Geneva, Sciences III, 30 Quai Ernest Ansermet, CH 1211 Genève 4, Switzerland
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:290858
    Summary
    Four distinctive morphological types can be found among living Globocassidulina in surface sediments of Admiralty Bay (King George Island, South Shetland Islands). The molecular analysis of the SSU and ITS rDNA indicates that they are monospecific and belong to Globocassidulina biora, except for minute forms from deeper than 200 m water depth which probably represent G. subglobosa. The morphological types of G. biora that show doubled or branched apertures, varied test size and shape as well as colour of cytoplasm, represent populations at different stages of ontogenetic development. However, the variability among large G. biora from the same locations is difficult to comprehend. It seems probable that G. biora is the only recent, large, shallow water Globocassidulina represented throughout the Antarctica, while G. crassa is typical for the Magellan region