A. Sfriso et al., SPECIES COMPOSITION, BIOMASS, AND NET PRIMARY PRODUCTION IN SHALLOW COASTAL WATERS - THE VENICE LAGOON, Bioresource technology, 44(3), 1993, pp. 235-250
Citations number
67
Categorie Soggetti
Energy & Fuels","Biothechnology & Applied Migrobiology",Agriculture
Three areas displaying the main characteristics of the central Venice
lagoon were monitored in 1989-91 to study macroalgal production in rel
ation to different biomass densities and species compositions. Two are
as that were covered by dense (0-20 kg m-2, wet wt), monospecific, Ulv
a rigida populations (> 96%) showed a net biomass production of 7-16 k
g m-2 year-1, wet wt, corresponding to 149-358 g C m-2 year-1, and dai
ly biomass yields up to 1500 g m-2, wet wt. A third area, characterize
d by a biomass of < 3 kg m-2 constituted by five main species, display
ed a net biomass production of 6-9 kg m-2 year-1, i. e. 132-196 g C m-
2 year The percentage daily biomass increase was low (0-5%) at high bi
omass densities (> 5 kg m-2, wet wt) and very high (up to 200%) when b
iomass was < 100 g m-2, wet wt. The ratio of annual biomass production
to highest measured biomass (ABP/HMB) was inversely related to the bi
omass density and ranged from 1.5 to 4.5. On the basis of these ratios
and of the standing crops measured by 180 sampling sites in the late
summer during the highest-algal-growth period, the annual net biomass
production in the central Venice lagoon was estimated to be approximat
ely 1 550 000 tons on a wet-weight basis.