252
Flnialela
48000
AtlAntic
120 Ian
38000
P. Dion and S. Le Bozec
.........................................
.. ::::Gironde ::::::::::::::::::::::
) (('Bay 01 AiCadiOii)' H H
:::::::::::::::::::::::::::::::::::::::::::
.:AII:I:···:III!:I.::!::::::II:::·:I .. II·I:::.
Fig. 9.1. Beach cast (stranded Ulva sp. in t wet weight) removed from beaches along the
coast of France in 1991
been demonstrated. However, by making the beaches unattractive (visual
and odoriferous pollution) during the summer period, they force coastal
townships and municipalities to undertake a costly removal scheme in
recreational or living areas. Moreover, immeasurable costs probably
originate with a decrease in a general degradation of the reputation of
the Brittany coastline. It should also be added that massive development
of seaweeds can be a physical hindrance for small coastal navigation or
mariculture, for example, shellfish cultivation. The hydrodynamic situation along the exposed Brittany coasts with strong swells and tidal water
movements prevents degradation of the algal masses in the water