The main results of these workshop were

Berichte Forsch.- u. Technologiezentr. Westküste d. Univ. Kiel Nr. 19 S. 89-91 Büsum 1999 ndGeneral conclusions and recommendations of the 2 Pri-Pro-Workshop 1998 at Buesum Peter Hartig & Klaus H. Vanselow Forschungs- und Technologiezentrum Westküste der Universität Kiel, Hafentörn, D-25761 Büsum As a general conclusion of this workshop we would like to emphasise that the main topic has been shifted from the traditional estimation of primary production by conventional O - and 214C-methods to the innovative saturation pulse fluorescence measurements. This was due to the fact that fluorescence techniques get increasing relevance in the estimation of photosynthetic parameters and primary production of phytoplankton over the last years. The main advantages of the saturation pulse fluorescence measurements are the rapid and non-invasive study of the photosynthetic efficiency of phytoplankton. However, regarding this method a number of questions remain open as was shown in the contributions by Mueller (1999; this issue), Hintze et al. (1999; this volume) and Hartig et al. (1999; this volume) as well as in the last PRI-PRO report 1998 (Domin et al., 1998; Hartig and Lippemeier, 1998). A subgroup of the current workshop showed that the common PAM-devices (LED-PAM, Xenon-PAM and PAM-2000) all provide a very similar estimate of photochemical efficiency under standardised conditions. Regarding the sensitivity, the Xenon-PAM proved to be most ...