Table 10.1. Estimated values of biomass a
,
production and P:B in preinteractive b
communities with exclusive dominance of Ulvaceans on
rocky substrata
Region and Locality
Cantabric Sea
-Cape Penas
Northwestern Rias
-Fucus vesiculosus horizon
-Himanthalia red-algae horizon
-Polluted area (Placeres) from
Fucus
vesiculosus horizon
to upper levels
Southern coast
-Higher horizons
-Lower horizons
Biomass
(g dry
wt m -2)
250
350
750
260 to 560
827
450-750
Estimated Production
(g dry wt m -2
year-I)
506.62
lO64.34
1140.60
811.3-2154
1424.9
775-1303
P:B
(year-I)
2.02
3.04
1.52
3.11-3.84
1.72
1.72
Reference
Fernandez, (1980)
Fuentes (1986)
Niell (1977)
Niell and Buela (1976);
Niell and Paz6 (1978);
Buela (unpub!.)
Espejo (1984)
Espejo (1984)
aAll of them must be considered as overestimations because ulvaceans never presented 1 m 2
of homogeneous cover and patchiness;
competition with other species reduced the biomass
11 5 to 1/10
of the original values.
bThese figures have been obtained after total cleaning of rocky surfaces in the intertidal system.
N
'-l
N
'TI
?<
3:!
~
~
~