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Nutrient uptake rates by the alien alga Undaria pinnatifida (Phaeophyta) (Nuevo Gulf, Patagonia, Argentina) when exposed to diluted sewage effluent.
- Source :
- Hydrobiologia; Jun2004, Vol. 520 Issue 1-3, p1-6, 6p
- Publication Year :
- 2004
-
Abstract
- In the early nineties, Undaria pinnatifida has been accidentally introduced to Nuevo Gulf (Patagonia, Argentina) where the environmental conditions would have favored its expansion. The effect of the secondary treated sewage discharge from Puerto Madryn city into Nueva Bay (located in the western extreme of Nuevo Gulf) is one of the probable factors to be taken into account. Laboratory cultures of this macroalgae were conducted in seawater enriched with the effluent. The nutrients (ammonium, nitrate and phosphate) uptake kinetics was studied at constant temperature and radiation (16 °C and 50 μE m<superscript>-2</superscript> s<superscript>-1</superscript> respectively). Uptake kinetics of both inorganic forms of nitrogen were described by the Michaelis–Menten model during the surge phase (ammonium: V<subscript>max</subscript><superscript>sur</superscript>: 218.1 μmol h<superscript>-1</superscript> g<superscript>-1</superscript>, K<subscript>s</subscript><superscript>sur</superscript>: 476.5 μM and nitrate V<subscript>max</subscript><superscript>sur</superscript>: 10.7 μmol h<superscript>-1</superscript> g<superscript>-1</superscript>, K<subscript>s</subscript><superscript>sur</superscript>: 6.1 μM) and during the assimilation phase (ammonium: V<subscript>max</subscript><superscript>ass</superscript>: 135.6 μmol h<superscript>-1</superscript> g<superscript>-1</superscript>, K<subscript>s</subscript><superscript>ass</superscript>: 407.2 μM and nitrate V<subscript>max</subscript><superscript>ass</superscript>: 1.9 μmol h<superscript>-1</superscript> g<superscript>-1</superscript>, K<subscript>s</subscript><superscript>ass</superscript>: 2.2 μM), with ammonium rates always higher than those of nitrate. Even though a net phosphate disappearance was observed in all treatments, uptake kinetics of this ion could not be properly estimated by the employed methodology. [ABSTRACT FROM AUTHOR]
- Subjects :
- UNDARIA pinnatifida
PLANT nutrients
ALGAE
AQUATIC plants
AQUATIC biology
SEWAGE
Subjects
Details
- Language :
- English
- ISSN :
- 00188158
- Volume :
- 520
- Issue :
- 1-3
- Database :
- Complementary Index
- Journal :
- Hydrobiologia
- Publication Type :
- Academic Journal
- Accession number :
- 15100165
- Full Text :
- https://doi.org/10.1023/B:HYDR.0000027686.63170.6c