Abstract
The growth and biomass production of the most abundant Gracilariaceae: Gracilariopsis longissima (S.G. Gmelin) M. Steentoft, L.M. Irvine et W.F. Farnham, Gracilaria gracilis (Stackhouse) M. Steentoft, L.M. Irvine et W.F.Farnham and Gracilaria vermiculophylla (Ohmi) Papenfuss, and of Ulva rigida C. Agardh were studied during 1 year in two areas of the Venice Lagoon, namely Tresse and San Giuliano, that were characterized by different trophic levels and water turbidity. Both growth and macroalgal production were monitored every 7–11 days in cubical cages placed on the bottom within the natural biomass. Environmental parameters, nutrient concentrations in the water column and surface sediments, and sedimentation rates were also determined. The biomass production of the two stations was very different and strongly influenced by the water turbidity and sedimentation rates. In both areas the availability of nutrients were high, but Tresse, where waters were more transparent, was more productive. In that area, the annual production of Gracilariaceae ranged between 21.9 and 28.2 kg fresh weight (fw) m−2 and G. longissima was the most productive species. Ulva production was within the same range (25.8 kg fw m−2). The mean relative growth rates on an annual basis were between 1.87 and 2.41% day−1. In contrast, in the turbid area (San Giuliano), the annual production of Gracilariaceae was much lower, ranging from 9.0 to 12.8 kg fw m−2 and that of Ulva was 15.2 kg fw m−2.
Article note:
This article is related to special issue Phycomorph: macroalgal development and morphogenesis, published in Botanica Marina 2017, vol. 60, issue 2.
About the authors
Andrea Augusto Sfriso graduated from Ca’ Foscari University of Venice in 2013. He is a PhD student at Ca’ Foscari University of Venice researching biotechnological applications for seaweeds, seaweed ecology and biochemistry. Currently, he is researching algal polysaccharides, fluorophores and wild bacterial strains for biomass conversion to high value compounds. He is laying the groundwork for a scientific expertise in the sustainable use of algal biomasses in transition environments.
Adriano Sfriso is a full professor of ecology at the University Ca’ Foscari Venice. His research concerns applied ecology, with particular attention to primary producers, eutrophication and pollution of the transitional environments. Prof. Sfriso has set up an environmental quality index (macrophyte quality index, MaQI) to assess the ecological status of the transitional environments of the Mediterranean eco-region based on the study of macrophyte associations. The index was inter-calibrated by the European Community and is currently applied in Italy according to the requirements of the European Water Framework Directive (2000/60/EC). Prof. Sfriso is an author of ca. 200 scientific publications, 85 of which appeared in ISI journals, and has taken part in ca. 220 congresses, meetings and workshops.
Acknowledgments
The authors are grateful to Dr. Orietta Zucchetta and the journal editor for the English editing.
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