322
M.-L. De Casabianca
c+IDgrl1
Mediterranean sea
20 kin
Fig. 13.8. Lagoons in Languedoc-Roussillon (France)
14
'""'
'" , 12
E
'a
10
~ 8
.3
.. 6
.. c
.~ 4
.. =
z 2
0
Thau
Mauguio
Prllvost
Diana
Urbino
Biguglla
Languedoclan lagoons
Corsican lagoons
Fig. 13.9. Annual means of nitrate and phosphate concentrations in Languedocian and
Corsican lagoons (cf. Table 13.1)
The mean and range of nutrient concentrations is given in Table 13.lo
The dominant macrophytes are the seagrass Zostera marina (2500 ha,
2000-3000 t dry weight, < 4 m depth), the red algae Gracilaria verrucosa
and Gracilaria bursa-pastoris (2000 ha, 2000-5000 t dry weight), the