caa a22 4500 465825524 CHVBK 20180323112148.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF02256748 doi (NATIONALLICENCE)springer-10.1007/BF02256748 Phases in the development of riverine plankton: Examples from the rivers Rhine and Meuse [Elektronische Daten] [E. De Ruyter Van Steveninck, B. van Zanten, W. Admiraal] Observations on phyto and zooplankton in two hydrographically different rivers were compared in order to discriminate phases in plankton development. Along the longitudinal axis of the River Rhine a gradual increase in the development of phytoplankton was observed, which reached its maximumca. 100 km before the river flows into its artificial sedimentation area. The development of rotifer populations was slightly retarded as compared with that of phytoplankton and highest population densities were only reached in the sedimentation area. Crustaceans developed in significant numbers, not until the river water had entered the sedimentation area. Development of zooplankton coincided here with a strong decrease in the density of phytoplankton. A similar trend in plankton development was observed in the River Meuse, although in this river the highest densities of phyto and zooplankton already occurred in its middle reaches. The differences in the timing of plankton growth in the two rivers are probably caused by differences in flow regime between both rivers. The River Rhine, which is fed by rainwater and melting of glaciers in the Alps, has a relatively constant discharge. On the other hand, the low discharge of the rain-fed River Meuse combined with an increased residence time of the water as a consequence of large numbers of weirs, allows a full cycle of plankton development long before its discharge into the sea. This phenomenon was also reflected in the silicate cycle in the Meuse, where the consumption by planktonic diatoms and the regeneration of silicate of deposits seem to be important. In contrast, in the main branches of the River Rhine only the effects of silicate consumption were detectable. Netherlands Hydrobiological Society, 1990 Phytoplankton nationallicence zooplankton nationallicence rivers nationallicence hydrology nationallicence silicate nationallicence De Ruyter Van Steveninck E. National Institute for Public Health and Environmental Protection (RIVM), P.O. Box 1, 3720 BA, Bilthoven, The Netherlands aut van Zanten B. National Institute for Public Health and Environmental Protection (RIVM), P.O. Box 1, 3720 BA, Bilthoven, The Netherlands aut Admiraal W. National Institute for Public Health and Environmental Protection (RIVM), P.O. Box 1, 3720 BA, Bilthoven, The Netherlands aut Hydrobiological Bulletin Kluwer Academic Publishers 24/1(1990-07-01), 47-55 0165-1404 24:1<47 1990 24 10452 https://doi.org/10.1007/BF02256748 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02256748 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- De Ruyter Van Steveninck E. National Institute for Public Health and Environmental Protection (RIVM), P.O. Box 1, 3720 BA, Bilthoven, The Netherlands aut NATIONALLICENCE 700 1- van Zanten B. National Institute for Public Health and Environmental Protection (RIVM), P.O. Box 1, 3720 BA, Bilthoven, The Netherlands aut NATIONALLICENCE 700 1- Admiraal W. National Institute for Public Health and Environmental Protection (RIVM), P.O. Box 1, 3720 BA, Bilthoven, The Netherlands aut NATIONALLICENCE 773 0- Hydrobiological Bulletin Kluwer Academic Publishers 24/1(1990-07-01), 47-55 0165-1404 24:1<47 1990 24 10452 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer