This website contains Dr. Elly Spijkerman's PhD thesis, titled _Phosphorus Uptake and Growth Kinetics in Plankton Desmid Species from Trophically Different Lakes_, which she completed in 1998 while in the Department of Aquatic Ecology at the University of Amsterdam. The six main thesis chapters have appeared in publications such as the European Journal of Phycology, Journal of Plankton Research, Journal of Phycology, and Hydrobiologia, and the site provides links to all these journals. Dr. Spijkerman's thesis chapters include: Competition for Phosphorus Between Planktonic Desmid Species in Continuous-Flow Culture; Different Response Mechanisms of Two Planktonic Desmid Species (Chlorophyceae) to a Single, Saturating Addition of Phosphate; Alkaline Phosphatase Activity in Two Planktonic Desmid Species and the Possible Role of an Extracellular Envelope; Ecophysiological Characteristics of Two Planktonic Desmid Species Originating From Trophically Different Lakes, and more. The text also includes a substantial list of references, and a concise summary.