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Winter bloom of coccolithophore Emiliania huxleyi and environmental conditions in the Dardanelles

机译:达达尼尔海峡中的球石藻Emiliania huxleyi的冬季开花和环境条件

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摘要

Following a summer bloom of coccolithophore Emiliania huxleyi (Lohmann) Hay & Mohler, 1967, in 2003, a winter bloom was observed for the first time between late December 2003 and early January 2004 in the Dardanelles. Microscopic observations showed that the cell dimensions of E. huxleyi (Ehux) varied from 9.85 to 13.50 μm in diameter (mean: 11.20 ± 1.38 μm). While Ehux revealed a relatively small population density (1.60 × 10~4 cells L~(-1)) in early December 2003, the bloom started in middle December 2003 (7.86 × 10~6 cells L~(-1)) and then peaked in early January 2004 (5.03 × 10~7 cells L~(-1)) in the superficial layer. The peak dramatically decreased in late January 2004 (7.50 × 10~6cellsL~(-1)). Ehux was the dominant species and represented about 90.0% of the phytoplankton assemblage. The bloom started flourishing after the diatom and dinoflagellate blooms under nitrogen depletion and moderate light, temperature and salinity conditions. Water temperature (10.31 ± 1.14℃) and salinity values (27.05 ± 0.88 ppt) were usually stabile. Surface chlorophyll-a concentrations ranged from 1.23 to 2.32 μgL~(-1) during the bloom. The ratios of N:P (mean: 4.12 ± 2.22) and Si:P (40.35 ± 16.25) of the bloom period were lower than those of the non-bloom periods.
机译:在1967年的瓢虫石蜡虫(Lohmann)Hay&Mohler于2003年夏季开花之后,2003年12月下旬至2004年1月初在达达尼尔海峡首次观察到冬季开花。显微镜观察表明,赫氏大肠杆菌(Ehux)的细胞大小在直径的9.85到13.50μm之间变化(平均:11.20±1.38μm)。虽然Ehux在2003年12月上旬显示出相对较小的种群密度(1.60×10〜4个细胞L〜(-1)),但开花始于2003年12月中旬(7.86×10〜6个细胞L〜(-1)),然后表层最高于2004年1月上旬(5.03×10〜7个细胞L〜(-1))。峰值在2004年1月下旬急剧下降(7.50×10〜6cellsL〜(-1))。以胡为主要物种,约占浮游植物总种群的90.0%。在氮耗竭和适度的光照,温度和盐度条件下,硅藻和鞭毛藻开花后,开花开始繁荣。水温(10.31±1.14℃)和盐度值(27.05±0.88 ppt)通常稳定。在开花期间,表面叶绿素a的浓度范围为1.23至2.32μgL〜(-1)。开花期的N:P比(平均值:4.12±2.22)和Si:P的比值(40.35±16.25)低于非开花期。

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