Depth distribution of radiolarians from the Chukchi and Beaufort Seas, western Arctic |
| |
| Authors: | Takuya Itaki Masashi Ito Hisashi Narita Naokazu Ahagon Hideo Sakai |
| |
| Institution: | a Institute for Marine Resources and Environment, Geological Survey of Japan, AIST, Higashi 1-1-1, AIST central 7, Tsukuba 305-8567, Japan;b IFREE/Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan;c Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan;d Japan Marine Science and Technology Center, Mutsu 035-0022, Japan;e Department of Earth Sciences, Toyama University, Toyama 930-0855, Japan |
| |
| Abstract: | The depth distributions of the radiolarian fauna in the Chukchi and Beaufort Seas, marginal seas of the western Arctic Ocean, were examined quantitatively in depth-stratified plankton tows from 4 or 5 intervals above 500 m and in surface sediments from various depths between 163 and 2907 m. The radiolarian assemblage from the water column in September 2000 was dominated by Amphimelissa setosa and followed by the Actinomma boreale/leptoderma group, Pseudodictyophimus gracilipes and Spongotrochus glacialis. These species are related to the Arctic Surface Water shallower than 150 m. This assemblage is similar to that in the Greenland Sea relating to the ice edge, but did not contain typical Pacific radiolarians in spite of the flow of water of Pacific origin in this region. The living depth of Ceratocyrtis historicosa was restricted to the relatively warm water between 300 and 500 m corresponding to the upper Arctic Intermediate Water (AIW) originating from the Atlantic Ocean. Radiolarian assemblages in the surface sediments are similar to those in the plankton tows, except for common Cycladophora davisiana in sediment samples below 500 m. C. davisiana is probably a deep-water species adapted to the lower AIW or the Canadian Basin Deep Water ventilated from the shelves. |
| |
| Keywords: | Radiolaria Depth distribution Chukchi Sea Beaufort Sea Plankton tows Surface sediments |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
