Abstracts
Experiments of water enrichments with natural populations of phytoplankton were carried out at the region of Ubatuba (Lat. 23º30'S - Long. 45º06'W) during winter and summer time. Special attention was given to the influence of nitrogen and phosphorus on the standing-stock (chlorophyll-α) and 14C assimilation and dark fixation in situ conditions. The phytoplankton populations was analysed in terms of its composition and hydrographical parameters were made according to Strickland & Parsons (1968). The enrichments with surface waters reveal that nitrogen may be the major limiting factor for phytoplankton biomass sensu Liebig.
Uma serie de experimentos com águas su perficiais da região de Ubatuba contendo populações naturais de fitoplancton, foi utilizada para se avaliar o papel do nitrogénio e do fosforo sobre a síntese da clorofila-α e da assimilação do 14C na luz e da fixação do no escuro. A composição do fitoplancton foi analisada e alguns parâmetros hidrográficos determinados. Pelos resultados obtidos, concluímos que o nitrogénio é o principal fator limitante, com relação a biomassa do fitoplâncton, segundo "sensu" de Liebig.
ARTIGOS
The effects of nitrogen and phosphorus enrichments on phytoplankton in the region of Ubatuba (Lat. 23º30'S - Long. 45º06'W), Brazil
Clóvis TeixeiraI; J. G. TundísiII
IInstituto Oceanográfico da Universidade de São Paulo
IIDepartamento de Ciencias Biológicas, Universidade Federal de São Carlos
SYNOPSIS
Experiments of water enrichments with natural populations of phytoplankton were carried out at the region of Ubatuba (Lat. 23º30'S - Long. 45º06'W) during winter and summer time. Special attention was given to the influence of nitrogen and phosphorus on the standing-stock (chlorophyll-α) and 14C assimilation and dark fixation in situ conditions. The phytoplankton populations was analysed in terms of its composition and hydrographical parameters were made according to Strickland & Parsons (1968). The enrichments with surface waters reveal that nitrogen may be the major limiting factor for phytoplankton biomass sensu Liebig.
RESUMO
Uma serie de experimentos com águas su perficiais da região de Ubatuba contendo populações naturais de fitoplancton, foi utilizada para se avaliar o papel do nitrogénio e do fosforo sobre a síntese da clorofila-α e da assimilação do 14C na luz e da fixação do no escuro. A composição do fitoplancton foi analisada e alguns parâmetros hidrográficos determinados.
Pelos resultados obtidos, concluímos que o nitrogénio é o principal fator limitante, com relação a biomassa do fitoplâncton, segundo "sensu" de Liebig.
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Acknowledgments
Part of this research was supported by Organization of American States. Our thanks are also due to Mr. Renato Fernandes for his help throughout the course of this work carried out in 1972.
(Received 22 July 1981)
- DUNSTAN, W. M. & MENZEL, D. W. 1971. Continuous cultures of natural populations of phytoplankton in dilute, treated sewage effluent. Limnol. Oceanogr, 16(4):623-632.
- RYTHER, J. H. & DUNSTAN, W. M. 1971. Nitrogen, phosphorus and eutrophication in the coastal marine environment. Science, 171:1008-1013.
- STEEMANN-NIELSEN, E. 1952. The use of radio-active carbon (C14) for measuring organic production in the sea. J. Cons. perm. int. Explor. Mer, 18:117-140.
- STRICKLAND, J. D. H. & PARSONS, T. R. 1968. A practical handbook of seawater analysis. Bull. Fish. Res. Bd Can., (167):1-311.
- THOMAS, W. H. 1967. The nitrogen nutrition of phytoplankton in the northeastern tropical Pacific Ocean. Studies of Tropical Oceanography, Miami, 5:280-289.
- ______ 1970. A nitrogen defficiency in tropical Pacific Oceanic phytoplankton: photosynthetic parameters in poor and rich water. Limnol. Oceanogro, 15(3):380-385.
- TEIXEIRA. C 1973. Preliminary studies of primary production in the Ubatuba region (Lat. 23ş30'S - Long. 45ş06'W), Brazil. Bolm. Inst. oceanogr., S Paulo, 22:49-58.
- ______ & VIEIRA, A. H. A. 1976. Nutrient experiment using Phaedacty tricornutum as an assay organism. Bolm Inst. oceanogr., S Paulo, 25(1):29-42.
- VINCE, S. & VALIELLA, I. 1973. The effects of ammonium and phosphate enrichments on chlorophyll-α, pigment ratio and species composition of phytoplankton of Vineyard Sound. Mar. Biol., 79:69-73.
- ÜTERMÖHL, H. 1931. Neue Wege in der quantitativen Erfassung des Plankton. Verh. int. Verein. theor. angew. Limnol., 5:567-596.
Publication Dates
-
Publication in this collection
05 June 2012 -
Date of issue
1981
History
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Received
22 July 1981