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Primary production of phyto plankton in the 3 types of amazonian waters 5. some investigations on the phyto plankton and its primary productivity in the clear water of the lower rio tapajos para brazil






Amazoniana 7(3): 335-348

Primary production of phyto plankton in the 3 types of amazonian waters 5. some investigations on the phyto plankton and its primary productivity in the clear water of the lower rio tapajos para brazil

Midriver areas show no stratification. In certain reaches of the river, distinct increases of pH-values temporarily occur due to strong phytoplankton activity. A few species of Cyanophyceae and Diatomeae make up the vast majority of phytoplankton in terms of numbers. Chlorophyceae, Desmidiaceae and other algae are characterized by high species diversity but only occur in low or moderate densities. Despite the low nutrient concentrations encountered, phytoplankton production is high, due to the excellent light conditions in the river. The net production of 2.4 g C/m2 per day exceeds production rates from varzea-lakes, although production densities are lower. A large productive zone in combination with extremely fast turonver rates make this unexpectedly high production per unit area possible. The shortest C turnover time was 0.3 days. Phytoplankton net production amounts to a calculated 5 t [tons] C/ha per yr. A theoretical fish production of 100 kg/ha per year was estimated, which would allow sustained yearly catches of .gtoreq. 10-20 kg/ha for human consumption.


Accession: 006184223



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