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Spectral fingerprinting of phytoplankton populations by two dimensional fluorescence and the fourier transform based pattern recognition

, : Spectral fingerprinting of phytoplankton populations by two dimensional fluorescence and the fourier transform based pattern recognition. Journal of Marine Research 43(4): 893-906

The selectivity of fluorescence spectroscopy is exploited for the characterization of marine algae. Two-dimensional digital images of in vivo fluorescence intensity versus excitation and emission wavelengths, called excitation-emission matrices (EEMs), are used as spectral "fingerprints" for marine phytoplankton populations. Fourier-transform-based pattern recognition is described along with its inherent strengths and weaknesses for the analysis of natural populations. The EEMs of unknown algae are compared to a library of standard EEMs representing 23 algal species and 6 classes with better than 80% accuracy. The EEMs acquired under different physiological conditions are used in determining pattern recognition reliability. The potential for fingerprinting mixed populations and oceanographic regions is also discussed.

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