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Dinoflagellate cyst distribution in surface sediments from the South China Sea in relation to hydrographic conditions and primary productivity
Marine Micropaleontology ( IF 1.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.marmicro.2019.101815
Zhen Li , Vera Pospelova , Hiroshi Kawamura , Chuanxiu Luo , Kenneth Neil Mertens , Ivan Hernández-Almeida , Kedong Yin , Yongsheng Wu , Hui Wu , Rong Xiang

Abstract The geographical distribution of dinoflagellate cysts was investigated in palynologically treated surface sediments from the South China Sea (SCS) to understand the driving environmental factors associated with specific taxa. The western SCS generally has higher total cyst concentrations (>300 cysts g−1) than the eastern region ( 1000 cysts g−1) occur off southern Vietnam, whereas the lowest cyst concentrations are off Luzon. The ratio of heterotrophic to autotrophic taxa has inverse distributional patterns to total cyst concentrations, and is likely to be related to an increase in relative abundances of autotrophic taxa when nutrient inputs increase. Brigantedinium spp., Selenopemphix nephroides, and Stelladinium reidii have their highest relative abundances and concentrations off Borneo. Their concentrations are significantly positively correlated with January sea-surface temperature (SST-Jan). In contrast, concentrations of Selenopemphix undulata, Spiniferites hyperacanthus, Dapsilidinium pastielsii and Operculodinium?longispinigerum are negatively correlated with SST-Jan. Lejeunecysta sabrina, cysts of Protoperidinium spp., Votadinium spp., Quinquecuspis concreta and Selenopemphix quanta are positively correlated with chlorophyll-a (chl-a) concentrations and are found in the high primary productivity regions of the SCS. Total Impagidinium, Impagidinium aculeatum, Impagidinium paradoxum, Impagidinium patulum, Nematosphaeropsis labyrinthus, and Polysphaeridium zoharyi are positively correlated with water depth. Their highest abundances are recorded in the northern slope-deep basin that is influenced by the Kuroshio Current, and this cyst assemblage indicates an open-ocean environment.

中文翻译:

南海表层沉积物中甲藻囊肿分布与水文条件和初级生产力的关系

摘要 研究了南海 (SCS) 经孢粉处理的表层沉积物中甲藻孢囊的地理分布,以了解与特定分类群相关的驱动环境因素。西部南海的总孢囊浓度(>300 个孢囊 g-1)通常高于东部地区(1000 个孢囊 g-1)发生在越南南部附近,而最低的孢囊浓度出现在吕宋岛附近。异养与自养类群的比例与总孢囊浓度呈反向分布,并且可能与营养输入增加时自养类群的相对丰度增加有关。Brigantedinium spp.、Selenopemphix nephroides 和 Stelladinium reidii 在婆罗洲附近的相对丰度和浓度最高。它们的浓度与 1 月海面温度 (SST-Jan) 呈显着正相关。相反,Selenopemphix undulata、Spiniferites hyperacanthus、Dapsilidinium pastielsii 和 Operculodinium?longispinigerum 的浓度与 SST-Jan 呈负相关。Lejeunecysta sabrina、Protoperidinium spp.、Votadinium spp.、Quinquecuspis concreta 和 Selenopemphix quanta 的包囊与叶绿素 a (chl-a) 浓度呈正相关,并且发现于 SCS 的高初级生产力区域。Total Impagidinium、Impagidinium aculeatum、Impagidinium paradoxum、Impagidinium patulum、Nematosphaeropsis labyrinthus和Polysphaeridium zoharyi与水深呈正相关。它们的最高丰度记录在受黑潮影响的北部斜坡深盆地,
更新日期:2020-08-01
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