Measurements of coccospheres and coccoliths of the species Gephyrocapsa huxleyi and G. ericsonii in natural populations in the Gulf of Aqaba and the Eastern Mediterranean Sea

To disentangle the effect of macronutrient availability on cell-size in native populations of coccolithophores we surveyed the seasonality of the prevalent coccolithophores in the northern Red Sea and the Eastern Mediterranean and performed a series of incubations assays. The size variations of coccospheres and coccoliths of the species Gephyrocapsa huxleyi and G. ericsonii native populations from samples of monitoring stations in the Gulf of Aqaba (Station A, 29.475 °N, 34.940 °E) and in the Eastern Mediterranean Sea (Themo2, 32.820 °N, 34.380 °E) were analysed using scanning electron microscopy and the relation to specific macronutrient availability was examined.

为厘清大量营养素（macronutrient）有效性对颗石藻（coccolithophore）原生种群细胞大小的调控效应，本研究对北红海与东地中海海域的优势颗石藻类群开展了季节动态调查，并实施了一系列培养实验。本研究针对采自亚喀巴湾监测站位（站位A，29.475 °N，34.940 °E）与东地中海海域（Themo2站位，32.820 °N，34.380 °E）的原生种群样本，采用扫描电子显微镜（scanning electron microscopy）分析了赫氏颗石藻（Gephyrocapsa huxleyi）与埃里克松颗石藻（G. ericsonii）的颗石球（coccosphere）及颗石片（coccolith）的尺寸变异特征，并探讨了其与特定大量营养素有效性之间的关联。