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Four-year long fluxes of total radiolarians, three major radiolarian subgroups, and selected radiolarian species were examined for their intra-annual and interannual changes in temporal production in ...the eastern subarctic Pacific Ocean. The study region was chosen for its high biological productivity and a large amplitude of seasonality Automated time-series sediment traps were deployed at Station PAPA in the Gulf of Alaska during 1982 through 1986. Temporal fluxes of radiolarians showed large seasonal and interannual changes in their productivity during the course of the field experiment. Fluxes of Lithomelissa setosa, a nassellarian taxon, displayed a distinct spring seasonal pattern that was not recorded in any other siliceous microplankton fluxes in the region. Therefore, this unique taxon is useful as a spring season indicator for a variety of applications in productivity studies. The temporal flux pattern of Ceratospyris borealis, a nassellarian radiolarian, resembles quite well with that of N. seminae, a dominant diatom taxon with strong productivity signals, suggesting that this radiolarian species is a promising productivity indicator. Radiolarian diversity indices and total radiolarian fluxes are anti-correlated, indicating the total Radiolaria as a productivity indicator. Their temporal changes also match with all other relevant productivity parameters examined.続きを見る
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