320
M.-L. De Casabianca
fauna. The regression from a typically diverse stenohaline marine community to a euryhaline less diversified community seems to be indicative
of increasing eutrophication.
13.3 Macrophytic Production and Eutrophication
Eutrophication of lagoons may come from various sources, as for
example shown in Fig. 13.7. External sources include various industrial,
agricultural or domestic waste waters that are brought into the lagoon
300~------------------------------------------------~
o
MAUGUIO
GREC
o Agricultural
II Domestic
•
Industrial
~ Total
MEJEAN
ARNEL
PREVOST VIC+INGRIL
THAU
50.-------------------------------------------------~
40
o
MAUGUIO
GREC
o Agricultural
II Domestic
•
Industrial
~ Total
MEJEAN
ARNEL
PREVOST VIC+INGRIL
THAU
Fig. 13.7. Annual nitrogen and phosphorus loads of some French Mediterranean lagoons.
(Agence de L'Eau-Montpellier 1991)