Globigerinoides ruber (white), a tropical to sub-tropical planktonic foraminiferal species which dwells in the mixed layer, has garnered significant attention of paleoceanographic investigations. Recent studies on G. ruber (w) morphotypes (G. ruber sensu stricto (s.s.) and G. ruber sensu lato (s.l.)) have inferred differences in seasonal calcification depths and offsets in isotopic and elemental data. To decipher if the morphotype abundances vary in response to changes in Indian Summer Monsoon (ISM), two well-dated sediment cores from the Andaman Sea, a core monsoon area in the northeastern Indian Ocean, are investigated. The abundance variations of G. ruber s.s. are very similar to total G. ruber (w), whereas G. ruber s.l. is very sensitive to the hydrologic changes linked to the ISM variability. Increased abundances of G. ruber s.l. were observed during periods of weak stratification and the resultant increase in productivity. The last glacial maximum (LGM), deglacial, Younger Dryas (YD) and late Holocene periods with weak ISM are characterized by a high abundance of G. ruber s.l. Conversely, this morphotype abundance decreased from 30 to 23 ka, Bølling/Allerød (B/A), early and mid-Holocene when the ISM was enhanced. The large variation of G. ruber morphotypes in the Andaman Sea is attributed to the selective preference of nutrient-rich water which varied with water column changes (salinity-controlled stratification) associated with ISM evolution. The elevated abundances of G. ruber s.l. during the glacial period closely match with the available records from other regions, possibly making them potential climatic markers.

Globigerinoides ruber（白色）是一种热带到亚热带的浮游有孔虫，生活在混合层中，已经引起了古海洋学研究的极大关注。在最近的研究G.曲霉（W）形态（G.曲霉属狭义（SS）和G.曲霉意义上拉托（SL））已经推断出季节性钙化深度和偏移量同位素和元素的数据差异。为了解释形态类型的丰度是否随印度夏季风（ISM）的变化而变化，研究了来自安达曼海（印度洋东北部的一个季风区）的两个日期合适的沉积物核心。赤霉菌的丰度变化与总赤霉菌非常相似（w），而卢布尔氏酵母Sl对与ISM变​​异性相关的水文变化非常敏感。在较弱的分层期间，观察到赤霉菌sl的丰度增加，从而导致生产率提高。末期冰期最大值（LGM），冰期，年轻特里亚斯（YD）和ISM弱的全新世晚期的特征是高密度红曲霉sl。相反，这种形态型的丰度从30 ka降低到23 ka，Bølling/Allerød（B / A），即ISM增强时的全新世早期和中期。G.ruber的大变化安达曼海的形态型归因于富含营养的水的选择性偏好，该营养物随与ISM演化相关的水柱变化（盐度控制的分层）而变化。冰川期红曲霉sl的丰度与其他地区的可用记录高度吻合，可能使它们成为潜在的气候标志。