N. pachyderma (sin.); T. quinqueloba. Correspondence

• Main Authors: Theodora Pados, Robert F. Spielhagen, Department Of
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Fram Strait; Arctic Ocean; depth habitat; Arctic; Foraminifera*; Neogloboquadrina pachyderma
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.644.3341; http://www.polarresearch.net/index.php/polar/article/download/22483/pdf_1/

To describe the horizontal and vertical distribution of recent planktic foraminifera in Fram Strait (Arctic), plankton samples were collected in the early summer of 2011 using a MultiNet sampler (63 mm) at 10 stations along a westeast transect at 78850?N. Five depth intervals were sampled from the sea surface down to 500 m. Additionally, sediment surface samples from the same locations were analysed. The ratio between absolute abundances of planktic foraminifera in the open ocean, at the ice margin and in the ice-covered ocean was found to be approximately 2:4:1. The assemblage was dominated by the polar Neogloboquadrina pachyderma (sin.) and the subpolar Turborotalita quinqueloba, which accounted for 76 and 15 % of all tests in the warm, saline Atlantic waters and 90 and 5 % in the cold and fresh Polar waters, respectively. Both species had maximum absolute abundances between 0 and 100 m water depth, however, they apparently lived shallower under the ice cover than under ice-free conditions. This indicates that the depth habitat of