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Responses of the Phytoplankton Community of a Tropical Reservoir (São Paulo, Brazil) to the Enrichment with Nitrate, Phosphate and EDTA

✍ Scribed by Raoul Henry; José Galizia Tundisi

Publisher
John Wiley and Sons
Year
1983
Tongue
English
Weight
622 KB
Volume
68
Category
Article
ISSN
1434-2944

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✦ Synopsis

The effects of artificial enrichment with nitrate, phosphate and EDTA on the phytoplankton community were studied in the Lob0 Reservoir (SBo Paulo, Brazil). After 14 days of in situ incubation, the amounts of suspended matter and chlorophyll a, the numbers of cells and the carotene/chlorophyll ratio were determined. The addition of nitrate and phosphate to water samples produced significant effects on the chlorophyll a and cell counts, while EDTA acted only on the cell production. Both nitrate and phosphate, when analysed individually, caused a decrease in the value of the carotene/chlorophyll ratio. A synergistic effect of the addition of EDTA and N on the suspended matter was observed.

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Primary Production and Effects of Enrich
Primary Production and Effects of Enrichment with Nitrate and Phosphate on Phytoplankton in the Barra Bonita Reservoir (State of São Paulo, Brazil)
✍ Dr. Raoul Henry; Kozo Hino; José Geraldo Gentil; José Galazia Tundisi 📂 Article 📅 1985 🏛 John Wiley and Sons 🌐 English ⚖ 818 KB

Primary productivity of the phytoplankton was evaluated by the 1% and dissolved oxygen methods in December 1981 a t the Barra Bonita Reservoir (SBo Paulo State, Brazil). The primary production varied between 0.17 t o 14.51 mg C m-3 h-1 a t 4 and 0 m depth, respectively. About 57 to 94 of the photosy