Understanding the Status of the Micro World Within the Macro One. Topics: Sampling Methods, Isolation and Enrichment, Identification and Quantification of Microorganisms in Open Waters and Salt Ponds, Molecular Tools to Characterize the Population Variability and Its Physiological Conditions, Oceanographic Processes, Primary and Secondary Productivity, Control Mechanisms and Adaptations to Stressful Environments and Theis Relations to Global Changes and Human Influence on Marine Systems.