|Measurements of ATP and organic carbon in suspended matter of the Dutch Wadden Sea|
Manuels, M.W.; Postma, H. (1974). Measurements of ATP and organic carbon in suspended matter of the Dutch Wadden Sea. Neth. J. Sea Res. 8(2-3): 292-311
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
|Authors|| || Top |
Measurements of ATP, following Holm Hansen's method, and of particulate organic carbon were carried out in the Dutch Wadden Sea and adjacent water bodies from April 1970 to August 1971 (Period I) and August 1971 to December 1972 (Period II). In Period I suspended material coarser than 150 µm was removed by filtration; in Period II all material was used. It is assumed that in Period I chiefly phytoplankton was measured and in Period II phyto- and zooplankton. This assumption needs further confirmation. ATP shows a seasonal variation between less than 5 ng/l in winter and more than 5000 ng/l in summer. The average amount of phytoplankton is about 0.05 mg C/l with a peak in summer of 0.2 mg C/l ; for zooplankton these values are 0.04 mg C/l and 0.15 mg C/l, respectively. Particulate organic carbon shows very little seasonal changes: the percentage in suspended matter is slightly higher in summer than in winter (about 7% against about 3%), but total suspended matter concentrations are higher in winter. In summer, up to 80% of carbon may locally be contained in living material, but the average in summer is only 20% and in winter less than 0.1%. The overall average is 5%. On the watersheds, in nearshore areas, and in the Eems estuary these percentages are even lower. In the inner part of the Dollard the contribution of bacteria may be significant, but also the share of bacteria needs further investigation.