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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 4 | PAGES 521-537 | 1996
© Oxford University Press

research-article

Particulate and dissolved carbohydrates and proteins in Lobo Reservoir (São Paulo State, Brazil): relationships with phytoplankton

F. Striquer-Soares and L. Chevolot1,2

Departamento de Biologia Animal e Vegetal, Universidade Estadual de Londrina 86051 Londrina Pr., Brazil 1Laboratoire de Biologie Marine, ISOMER, Université de Nantes 2 rue de la Houssinière, F-44072 Nantes, France 2Present address: IFREMER-VP/BM-URA CNRS 502 Rue de l'Ile d'Yeu, BP 1105, 44311 Nantes, France

Received on March 31, 1995; accepted on November 17, 1995 This study analyses variations in the carbohydrate and protein concentrations of dissolved and particulate phases in samples of Lobo Reservoir water (São Paulo, Brazil) collected at {small tilde}2 week intervals (April 1989-March 1990) over a 1 year period. Carbohydrate concentrations were measured by the MBTH (3-methyl 2-benzothiazolinone hydrazone) method and protein concentrations by the Lowry assay. Concentrations of particulate organic carbon (POC), total particulate carbohydrates (TPCHO), water-soluble particulate carbohydrates (SPCHO) and particulate proteins (PPROT) ranged between 2.15 and 3.6, 0.40 and 1.90, 0.63 and 2.14 and 0.18 and 0.88 mg l–1, respectively; and the TPCHO/PPROT ratio was elevated (between 0.75 and 5.8). TPCHO variations reflected those of SPCHO, whereas PPROT showed much less variation. All these results are indicative of a carbohydrate-oriented metabolism. Concentrations of total dissolved carbohydrates (TDCHO) and proteins (DPROT) varied considerably between 0.26 and 1.74, and 0.28 and 2.91 mg l–1, respectively. Dissolved combined carbohydrates (0.13–1.55 mg l–1) were more abundant then dissolved free monosaccharides (0.07–0.36 mg l–1). which showed little variation. The phytoplankton community ranged between 10608 and 60619 cells ml–1, with Bacillariophyceae, Chlorophyceae and Cyanophyceae being the most abundant classes. Most regression analyses between biochemical variables (TPCHO, SPCHO, TDCHO, DPROT) and phytoplankton cell numbers were not significant, whereas the phytoplankton community appeared to play an important role for dissolved and particulate carbohydrates, but less for PPROT.


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