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Based on laboratory observations, planktonic foraminifers are omnivorous, feeding zooplankton and phytoplankton. Spinose species tend toward greater dependence on zooplankton prey than on phytoplankton prey, while non-spinose species are more adapted to herbivorous diets. However, the trophic activity of planktonic foraminifers in the natural environment and their trophic positions in the marine food web have not yet been fully understood. The trophic position (TP) of two non-spinose species,  Neogloboquadrina dutertrei  and  Pulleniatina obliquiloculata , was determined by differences in the nitrogen isotopic composition between two amino acids (glutamic acid and phenylalanine). Results show that TP values of  N. dutertrei  were ~ 2.4, indicating dependence on omnivorous (mixed herbivorous and carnivorous) diets, while those of  P. obliquiloculata  were ~ 2.1, indicating dependence on herbivorous diets. Together with previous laboratory observations, these TP values suggest that  N. dutertrei  is a detritivore or scavenger, while  P. obliquiloculata  is generally a herbivore. This trophic niche separation likely allows these two planktonic foraminiferal species to live within a similar depth zone in the open water column and provides a clue for understanding causes of spatial and temporal changes in their relative abundances in living and sediment assemblages.

Trophic niche separation of two non-spinose planktonic foraminifers Neogloboquadrina dutertrei and Pulleniatina obliquiloculata