Concentrations of chlorophyll-alpha combined with different size fractions of microplankton in sea water from the euphotic zone of the Aegean Sea at Station MARCH-1997-GN36199704601MSB01

Samples from 2 l of sea water were size fractionated by filtration through polycarbonate Millipore filters with pores 0.2 ?m, 1.2 ?m, and 3.0 ?m. The filters were kept deep frozen and analyzed according to Holm-Hansen et al. (Holm-Hansen, O., Lorenzen, C.J., Holmes, R.W., Strickland, J.D.H. 1965. Fluorometric determination of chlorophyll. Journal du Conseil Permanent International Pour L'Exploration de la Mer 30, 3-15).