Klappentext

This volume contains the keynote lectures, reports on the experimental work, and papers contributed as posters at the Fifth International Workshop of the Group for Aquatic Primary Productivity (GAP). GAP workshops bring together a diverse group of scientists interested in many aspects of aquatic primary productivity and the programmes are designed to promote the sharing of expertise through joint experimental work. This time the Workshop theme was the daily growth cycle of phototrophic micro-organisms, and incorporated different aspects of growth - increase in algal biomass, specific cell components and in cell numbers.

Inhalt
One: The Daily Growth Cycle.- The Keynote Lectures.- Diel periodicity in phytoplankton productivity.- The daily pattern of nitrogen uptake by phytoplankton in dynamic mixed layer environments.- Two: Daily Patterns of Growth in Culture and Lake.- Experimental Work.- Influence of medium frequency light/dark cycles of equal duration on the photosynthesis and respiration of Chlorella pyrenoidosa.- An algal cyclostat with computer-controlled dynamic light regime.- The effect of dynamic light regimes on Chlorella: I. Pigments and cross sections.- The effect of dynamic light regimes on Chlorella: II. Minimum quantum requirement and photo-synthesis-irradiance parameters.- Flow cytometry: instrumentation and application in phytoplankton research.- Characterization of the light field in laboratory scale enclosures of eutrophic lake water (Lake Loosdrecht, The Netherlands).- Influence of the mixing regime on algal photo synthetic performance in laboratory scale enclosures.- Diel changes in dark respiration in a plankton community.- Picoplankton photosynthesis and diurnal variations in photosynthesis-irradiance relationship in a eutrophic and meso-oligotrophic lake.- Three: Cell Cycle and Productivity.- Papers contributed to Posters.- Variations in biochemical parameters of Heterocapsa sp. and Olisthodiscus luteus grown in 12:12 light:dark cycles: I. Cell cycle and nucleic acid composition.- Variations in biochemical parameters of Heterocapsa sp. and Olisthodiscus luteus grown in 12:12 light:dark cycles: II. Changes in pigment composition.- Effect of Si-status on diel variation of intracellular free amino acids in Thalassiosira weissflogii under low-light intensity.- The 'true' growth efficiency of phytoplankton as influenced by light attenuation and insolation: implications ofthe photosynthesis-irradiance relationship.- Nutrients versus physical factors in determining the primary productivity of waters with high inorganic turbidity.- Deep chlorophyll a maxima in the Red Sea observed by in-vivo flash fluorometry.- Dynamic versus static models for photosynthesis.- Interspecific variation in pigmentation: implications for production estimates for shallow eutrophic lakes using an incubator.