Flux variations and vertical distributions of siliceous Rhizaria (Radiolaria and Phaeodaria) in the western Arctic Ocean: indices of environmental changes
| Autor: | Takahito Ikenoue, Katsunori Kimoto, Naomi Harada, Svetlana B Kruglikova, Jonaotaro Onodera, Kjell R. Bjørklund |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Water mass
geography geography.geographical_feature_category biology lcsh:QE1-996.5 Abyssal plain lcsh:Life Plankton biology.organism_classification lcsh:Geology lcsh:QH501-531 Oceanography Arctic lcsh:QH540-549.5 Sediment trap Sea ice lcsh:Ecology Ecology Evolution Behavior and Systematics Geology Radiolaria Earth-Surface Processes Canada Basin |
| Zdroj: | Biogeosciences, Vol 12, Iss 6, Pp 2019-2046 (2015) |
| ISSN: | 1726-4189 1726-4170 |
| Popis: | The vertical distribution of radiolarians was investigated using a vertical multiple plankton sampler (100–0, 250–100, 500–250, and 1000–500 m water depths, 62 μm mesh size) at the Northwind Abyssal Plain and southwestern Canada Basin in September 2013. To investigate seasonal variations in the flux of radiolarians in relation to sea ice and water masses, a time-series sediment trap system was moored at Station NAP (75°00´ N, 162°00´ W; bottom depth 1975 m) in the western Arctic Ocean during October 2010–September 2012. The radiolarian flux was comparable to that in the North Pacific Ocean. Amphimelissa setosa was dominant during the season with open water as well as at the beginning and end of the seasons with sea-ice cover. During the sea-ice-cover season, however, oligotrophic and cold-water-tolerant actinommids were dominant, productivity of Radiolaria was lower, and species diversity was greater. These suggest that the dynamics of sea ice are a major factor affecting the productivity, distribution, and composition of the radiolarian fauna. |
| Databáze: | OpenAIRE |
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