Wurstkammer specimens of the planktic foraminifer Neogloboquadrina pachyderma (sinistral): A new morphotype from the Arctic Ocean and the Weddell Sea.

Hommers, Harald (1997) Wurstkammer specimens of the planktic foraminifer Neogloboquadrina pachyderma (sinistral): A new morphotype from the Arctic Ocean and the Weddell Sea. In: Contributions to the micropaleontology and paleoceanography of the northern North Atlantic (collected results from the GEOMAR Bungalow Working Group). , ed. by Hass, H. Christian and Kaminski, Michael A.. Grzybowski Foundation, Krakow, pp. 253-262.

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Abstract

From two cores of the central Arctic Ocean and the Southern Ocean (Weddell Sea) a new morphotype
of the planktic foraminifer Neogloboquadrina pachyderma (sinistral) (Ehrenberg) with
"sausage" shaped final chambers (i.e. "Wurstkammer") is described. A comparison of these
morphotypes in the two polar regions shows significant differences in shape and frequency
during the last 70,000 years in the central Arctic Ocean and during the last 140,000 years in the
Weddell Sea. In the central Arctic Ocean the frequency of wurstkammer specinlens call be correlated
to that of the so-called kummerform specimens during the last 70,000 years; this correlation
cannot be seen in a core from the Weddell Sea. The wurstkammer and kummerform specimens
are interpreted as being end-members of a morphological progressional line. The
abnormal chamber growth is probably an adaption to various environmental stress conditions
found in the two polar regions during the last 70,000 in the Arctic and 140,000 years in the
Antarctic, but the reasons for this abnormality are not yet fully understood.

Document Type: Book chapter
Additional Information: Das Buch ist in der GEOMAR-Bibliothek vorhanden
Keywords: planktic foraminifer Neogloboquadrina pachyderma (sinistral), Weddell Sea, Arctic Ocean
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Date Deposited: 19 Jan 2016 08:56
Last Modified: 19 Jan 2016 08:56
URI: http://oceanrep.geomar.de/id/eprint/31044

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