With degradation of lipids in phase IV, their isotopic compositions varied in three different ways: positive shift for most fatty acids; little change for sterols and alkenones; and a negative shift for 20:5 fatty acid of T. weissflogii
With degradation of lipids in phase IV, theirisotopic compositions varied in three different ways: positive shift for most fatty acids; little change for sterolsand alkenones; and a negative shift for 20:5 fatty acid of T. weissflogii