Primary Production of Phytoplankton in the Three Types of Amazonian Waters V. Some Investigation on the Phytoplankton and its Primary Productivity in the Clear Water of the Lower Rio Tapajóz (Pará, Brazil)

Abstract

Four limnological investigations were conducted in different seasons of the years 1968 and 1969 at the lower reaches of the Rio Tapajóz. The physical and chemical parameters generally correspond with earlier fiidings of other authors. Midriver areas show no stratification of the water body. in certain reaches of the river, distinct inaeases of pH-values temporarily occur due to strong phytopiankton activity.