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| Content Provider | Springer Nature Link |
|---|---|
| Author | Martínez Aragón, J.F. Hernández, I. Pérez Lloréns, J.L. Vázquez, R. Vergara, J.J. |
| Copyright Year | 2002 |
| Abstract | The potential of three estuarine macroalgae (Ulvarotundata, Enteromorpa intestinalis andGracilaria gracilis) as biofilters for phosphate ineffluents of a sea bass (Dicentrarchus labrax) cultivationtank was studied. These seaweeds thrive in Cádiz Bay and were alsoselected because of their economic potential, so that environmental andeconomicadvantages may be achieved by future integrated aquaculture practices in thelocal fish farms. The study was designed to investigate the functioning of Pnutrition of the selected species. Maximum velocity of phosphate uptake (2.86μmol PO$_{4}$ g$^{−1}$ dry wth$^{−1}$) was found in U. rotundata.This species also showed the highest affinity for this nutrient. At low flowrates (< 2 volumes d$^{−1}$), the three species efficientlyfiltered the phosphate dissolved in the waste water, with a minimum efficiencyof 60.7% in U. rotundata. Net phosphate uptake rate wassignificantly affected by the water flow, being greatest at the highest rateassayed (2 volumes d$^{−1}$). The marked decrease in tissue P shownby the three species during a flow-through experiment suggested that growth wasP limited. However, due to the increase in biomass, total P biomass increasedinthe cultures. A significant correlation was found between growth rates and thenet P biomass gained in the cultures. A three-stage design under low water flow(0.5 volumes d$^{−1}$) showed that the highest growth rates (up to0.14 d$^{−1}$) and integrated phosphate uptake rates(up to 5.8 μmol PO$_{4}$ $^{3−}$ g$^{−1}$dry wt d$^{−1}$) were found in E.intestinalis in the first stage, with decreasing rates in thefollowing ones. As a result, phosphate become limiting and low increments oreven losses of total P biomass in these stages were found suggesting thatphosphate was excreted from the algae. The results show the potential abilityofthe three species to reduce substantially, at low water flow, the phosphateconcentration in waste waters from a D. labrax cultivationtank, and thus the quality of effluents from intensive aquaculture practices. |
| Starting Page | 365 |
| Ending Page | 374 |
| Page Count | 10 |
| File Format | |
| ISSN | 09218971 |
| Journal | Journal of Applied Phycology |
| Volume Number | 14 |
| Issue Number | 5 |
| e-ISSN | 15735176 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 2002-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Ecology Hydrobiology Plant Sciences Plant Physiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science Aquatic Science |
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