France - The Mediterranean Lagoons
Floating Macrophytes
(Cladomorpha vagabunda)
Euryhaline phanerogams
( Ruppia maritima)
<:
A
decomposed
Detritus
Macrofeeders
Sphaeroma hookeri
Gammarus aequicauda
:> <:
:>
B
C
~ dead
alive
: Detritus
: Microfeeders
: Corophium
•
:
insidiosum :
: Osuacodes
: Sea~
: Cardium glaucum: Fauna
:
: Idotea viridis
1 Predator
1 Hydrobia acuta
: Pomatoschistus : Brachydontes marioni
1: marmoratus
; : : Cardium exiguum
Predator
: Syngnathus abaster
: Aphanius fasciatus
: Gobius paganellus
317
Fig. 13.4. Section of a brackish lagoon littoral zone (slope 3-10%). A Zone subjected to
immersion; B intermediate zone; C seagrass zone
community with a high degree of adaptability and which is independent of the salinity and of the substrate type.
3. Communities typical for clean environments are replaced by a community exploiting a great deal of available detritus. The flora is characterized by the appearance of free-floating macroalgae, indicative of
eutrophication while the fauna is characterized by a predominance of
detritus feeders, mainly utilizing decomposed organic plant material.
13.2.3 The Urbino Basin (Western Shore) with Respect
to the Agricultural Exploitation of the Drainage Basins (1980-1990)
Owing to a more diffuse land runoff (leaching) on the southern side of
the peninsula, extreme concentrations of mineral nitrogen, up to tenfold,
increased particulate C and N levels, and in the extreme case 100-fold
higher concentrations of PO;3_p are typical for the Urbino basin
(Fig. 13.3 -13.5).
Floating Macrophytes
(Cladomorpha vagabunda)
Euryhaline phanerogams
( Ruppia maritima)
<:
A
decomposed
Detritus
Macrofeeders
Sphaeroma hookeri
Gammarus aequicauda
:> <:
:>
B
C
~ dead
alive
: Detritus
: Microfeeders
: Corophium
•
:
insidiosum :
: Osuacodes
: Sea~
: Cardium glaucum: Fauna
:
: Idotea viridis
1 Predator
1 Hydrobia acuta
: Pomatoschistus : Brachydontes marioni
1: marmoratus
; : : Cardium exiguum
Predator
: Syngnathus abaster
: Aphanius fasciatus
: Gobius paganellus
317
Fig. 13.4. Section of a brackish lagoon littoral zone (slope 3-10%). A Zone subjected to
immersion; B intermediate zone; C seagrass zone
community with a high degree of adaptability and which is independent of the salinity and of the substrate type.
3. Communities typical for clean environments are replaced by a community exploiting a great deal of available detritus. The flora is characterized by the appearance of free-floating macroalgae, indicative of
eutrophication while the fauna is characterized by a predominance of
detritus feeders, mainly utilizing decomposed organic plant material.
13.2.3 The Urbino Basin (Western Shore) with Respect
to the Agricultural Exploitation of the Drainage Basins (1980-1990)
Owing to a more diffuse land runoff (leaching) on the southern side of
the peninsula, extreme concentrations of mineral nitrogen, up to tenfold,
increased particulate C and N levels, and in the extreme case 100-fold
higher concentrations of PO;3_p are typical for the Urbino basin
(Fig. 13.3 -13.5).