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首页> 外文期刊>Journal of oceanography >Cycladophora davisiana (Radiolaria) in the Okhotsk Sea: A key for reconstructing glacial ocean conditions
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Cycladophora davisiana (Radiolaria) in the Okhotsk Sea: A key for reconstructing glacial ocean conditions

机译：鄂霍次克海的仙客来（Radiolaria）：重建冰川海洋条件的关键

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摘要

Cycladophora davisiana, a radiolarian species dwelling at mesopelagic depths, is known as a representative glacial fauna due to its unique distribution during glacial periods. In the present ocean, abundant production of C. davisiana is only observed in the Okhotsk Sea, indicating an adaptation of C. davisiana for seasonal sea-ice covered conditions. We found pronounced abundant production of C. davisiana during the early to middle Holocene in the Okhotsk Sea, suggesting more favorable conditions for C. davisiana than the present Okhotsk Sea. In order to clarify the reason, oceanographic conditions during the Holocene were reconstructed based on biomarkers, lithogenic grains including ice-rafted debris (IRD), biogenic opal, and total organic carbon (TOC) in two sediment cores from the Okhotsk Sea. These indicators suggest that the pronounced C. davisiana production may be attributed to: 1) a supply to mesopelagic depths under intensified stratification of fine organic particles derived from coccolithophorids, bacteria, and detrital materials; and 2) cold, well-ventilated intermediate water formation.
机译：居住在近中生深度的放射线虫种Cycladophora davisiana，因其在冰川期的独特分布而被称为代表性的冰川动物区系。在目前的海洋中，仅在鄂霍次克海中观测到了大黄鱼的大量生产，这表明大黄鱼适应了季节性的海冰覆盖条件。我们发现鄂霍次克海的全新世早期到中新世期间，C。davisiana的产量显着增加，这表明C. davisiana的条件比现在的鄂霍次克海更为有利。为了弄清原因，全新世期间的海洋条件是根据生物标志物，包括鄂霍次克海两个沉积物岩心中的成岩颗粒（包括浮冰碎片（IRD），生物蛋白石和总有机碳（TOC））进行重建的。这些指标表明，明显的戴维梭菌生产可能归因于：1）在源于球墨石藻，细菌和碎屑物质的精细有机颗粒的强化分层作用下，向中古深度供应; 2）通风良好的冷水中间层。

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