Roumen Kalchev

Biography

Date and place of birth: November, 20-th, 1951, Koubrat, Bulgaria Nationality: Bulgaria Education:1981-1984 Doctorate, at University “Taras Shevchenko” and Institute of Plant Physiology of Ukrainian Academy of Sciences, Kiev, (former Soviet Union) Thesis title: Fluorescence characteristics of some algal species and possibilities for their application for studying primary productivity of freshwaters Supervisor: Corresponding member of Ukrainian Academy of Sciences, Prof. D.M. Grodzinskii Laboratory study on algal cultures of Anabena variabilis, Scenedesmus bijugatus, Phaeodactylum tricornutum. Productivity measurements by released oxygen measured on gas-chromatographer and fluorescence registrations on a fluorimeter. 1975-1980 Master of Science in Biology University of Rostock (former East Germany) Diploma Thesis title: Carbohydrates in the alga Scenedesmus quadricauda. Supervisor: Prof. Dr. E. Wittenburg. Laboratory study of carbohydrates in the alga Scenedesmus quadricauda and field carbohydrates investigations in brackish waters. Teaching experience: 2006 – 2011 Supervisor of 1 PhD-student 2001 – 2005, 1987 – 1998 A part-time Assistant Professor Faculty of Biology, Sofia University, St. Kliment Ohridsky, Sofia Subject: Methods for assessing primary and secondary productivity in aquatic ecosystems since 1987 Supervisor of 4 M.Sc. students Faculty of Biology, Sofia University, St. Kliment Ohridsky, Sofia Memberships: National representative of Bulgaria in International Association for Danube Research, (IAD)

Research Interest

investigating plankton primary production, chlorophyll, phytoplankton abundance, nutrients, nutrient limitations, organic load, solar radiation above and under water (spectral light extinction coefficient) in stagnant inland freshwaters