Biologische Anstalt Helgoland Alfred-Wegener-Institut The Helgoland biological-oceanographical time-series Helgoland Reede Station (54o 11.3’N, 7o 54.0’E) water depth 6 - 8.5 m (tidal) Helgoland Transects (Central German Bight) Renate Scharek, Silvia Janisch, Peter Mangelsdorf, Christian Schütt, Hilke Döpke, Karl-Walter Klings, Gunnar Gerdts, Antje Wichels, Gerrit Sahling
Location of Helgoland and “Helgoland Reede“ sampling site in the German Bight of the North Sea
River Eider RiverElbe The three Helgoland Phytoplankton Transectsconsist of six stations each
Vessells serving the “Helgoland Reede” and the “Helgoland transects” time-series “Aade“ “Uthörn”
Annual medians of concentrations of phosphate, nitrate and phytoplankton carbon on “Helgoland Reede“from 1962 till 1994
Monthly medians of salinity, concentrations of silicate, phosphate and nitrate on “Helgoland Reede“ from 1995 till 1999
Monthly medians of phytoplankton carbon, devided into diatom carbon and flagellate carbon (below) on “Helgoland Reede“ from 1995 till 1998
On “Helgoland Reede” a clear seasonality can be observed in temperature, salinity, nutrient concentrations, phytoplankton stocks and species composition. However, also in apparent bacterial diversity, as investigated by Denaturing-Gradient-Gel-Electrophoresis patterns (DGGE), seasonally dependent diversity of planktonic marine bacteria can be detected (Schütt et al. unpublished).