Untersuchungen ueber die Wirkung von UV-B auf photoregulierte Entwicklungsvorgaenge bei Pflanzen und ueber deren Schutzmechanismen Abschlussbericht

SIGLEAvailable from TIB Hannover: F93B1396 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

IGOFS Indik. Teilprojekt 7: Pelagische Prozesse und Partikelfluss in der Arabischen See unter besonderer Beruecksichtigung der Bedeutung autotropher Kalkbildner und des Mesozooplanktons Schlussbericht

As part of the German Indian Ocean Project biological, chemical and hydrographical measurements were carried out in the context to investigate the seasonal evolution of biogeochemcial processes with the upswing of the SW monsoon in the Arabian Sea in 1997. Planktological investigations were carried out along a filament from his origin at the coastal upwelling off Oman till his dispersal in the open ocean. Therefore a satellite tracked drifting array with a sediment trap below the productive zone was deployed in this freshly upwelled water and followed for 19 days. During this time hydrographic measurements and extensive water-column sampling has been carried out for the determination of the physical properties and planktological bulk parameters. The results include data of the biochemical level on parameters which were designed for the documentation of nutrient conditions, biological stock parameters, fluxes in the epipelagial and the export production as well as primary production and zooplankton grazing rate. The most interesting results established form this investigation show that the filament is characterised by both high dynamic and heterogeneous systems with a combination of succession and advection. The composition of phytoplankton and zooplankton population as well as the primary production and grazing rate show a distinct variability along the filament. The model for phytoplankton aggregation which simulated the biological interactions for two sites in the Arabian Sea showed quite good agreement with the data that have been measured during the process study. The administration and development of the Ggerman JGOFS databank initialised in frame of this project take place under national and international co-operation. The results obtained during this study will be adopted to the national and international data syntheses and will contribute to the JGOFS goal to better understand the biogeochemical processes with varying temporal and spatial conditions in the Arabian Sea and to find out whether the western Indian Ocean is a sink or a source for carbon in the global carbon cycle. (orig.)SIGLEAvailable from TIB Hannover: DtF QN182,15) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman