Evaluation of parameters of a plankton community's biological rhythms under the natural environment of the Black Sea using the Fourier transform method.Night-time changes in bioluminescence intensity in the coastal area of the Black Sea were recorded.  The parameters of plankton communities' basic biological rhythms were determined using the discrete Fourier transform method. 
Fourier transform method
The parameters of plankton communities' basic biological rhythms were determined using the discrete Fourier transform method. 
the discrete Fourier transform method