Point sources
Competition
Antibiosis
Sedimentation
Grazing
Nutrients
NaCl
Lysis
Diffuse sources
Solar
radiations
discharges
Temperature
treatment plant
Fig. 15.8 Direct and diffuse sources of pathogenic microorganisms to coastal areas and environmental factors that change their physiological
state and survival capability in the environment (Drawing: m-j Bodiou)
Fig. 15.9 Tracer experiment with rhodamine in a coastal area
designed to determine the impact of the release of a wastewater treatment plant in the coastal environment. Rhodamine was injected in high
concentration at the outlet of the WWTP. It diffuses in the sea from the
end of the output (pipe), and the red plume is followed by aerial photo
over time. At the same time, samples are collected at various locations
and times to determine the dye concentration
646
P. Lebaron et al.