Physiological responses of two seaweed biofilter candidates, Gracilariopsis bailiniae Zhang et Xia and Hydropuntia edulis (S Gmelin), to nutrient source and environmental factor
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2011, Vol 4, Issue 5
Abstract
Two gracilarioid species, Gracilariopsis bailiniae and Hydropuntia edulis, were compared based on their growth under different temperature and salinity levels and nitrogen source and on their photosynthetic responses under different irradiance levels. Results show that growth of Gp. bailiniae was significantly higher than that of H. edulis. Both species were euryhaline and had optimum growth rates at 27˚C (16.06 % d[sup]-1[/sup]± 0.10 for Gp. bailiniae and 9.53 % d[sup]-1[/sup]± 0.62 for H. edulis) under both ammonium and nitrate enrichment. Gracilariopsis bailiniae was able to use both N-forms as a nitrogen source in all temperature and salinity levels tested. Meanwhile, the interactive effect of nitrogen source with temperature was observed for H. edulis with plants grown in nitrate enrichment showing significantly higher growth rates than those in ammonium. Nitrate enrichment also resulted to higher growth rates for H. edulis in all salinity levels tested. Photosynthetic rates of Gp. bailiniae were higher than H. edulis. We also found a two-fold difference between the maximum photosynthetic rate (Pmax) of Gp. bailiniae (12.41 ± 1.81) and that of H. edulis (6.44 ± 0.62). However, photosynthetic efficiency (α) was significantly higher in H. edulis than in Gp. bailiniae while compensation and saturation point irradiance levels were similar in both species.
Authors and Affiliations
Rhea Carton, Christopher Caipang, Masahiro Notoya, Daisuke Fujita
Keywords
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