Globorotalia inflata (Fig. 21) is a dominant species that occurs mainly in transitional environments between subtropical and polar water masses and is more dominant in the Indian Ocean than in the North Atlantic (Bé & Tolderlund,
1971). It shows relations with sea surface temperature, salinity, and temperature at 200 m but has broad tolerances for these parameters. It has preferences for water masses with little seasonal variation in salinity and shows close relations
with winter conditions in the vertical temperature gradient, surface water density, and stratification. In general it becomes abundant under a wider range of physical conditions during summer compared to the winter conditions.