1. DIURNAL VARIATIONS IN THE PHOTOSYNTHETIC ACTIVITY OF CYANOBACTERIAL BLOOM ON A FRESHWATER DAM RESERVOIR: AN ISOTOPIC STUDY. Authors: MARIUSZ-ORION JĘDRYSEK, L.I. WASSENAAR, A. TROJANOWSKA, D. LEWICKA-SZCZEBAK, M. KURASIEWICZ, W. DRZEWICKI.