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This article provides a summary of the paper "The Role of Caimans in the Nutrient Regime in the Mouth-Lakes of Amazon Affluents" presented by E.-J. Fittkau at the Spring Meeting of the Tropical Group of the British Ecological Society held in London, England, on April 24, 1969. According to the paper, the formerly abundant caimans of the central Amazon region have nearly become extinct because of the demand for their hides. It highlights the existence of close interdependence between caimans and the fish in the Amazonian water-bodies.

This article provides a summary of the paper "Limnological Conditions in Central Amazonia" presented by H. Sioli at the Spring Meeting of the Tropical Group of the British Ecological Society held in London, England, on April 24, 1969. The paper claims that limnological studies give insights into Amazonian landscape-ecology. It discusses the average annual rainfall in the region. It also describes the topography of the valleys and courses of the lower Amazon and the Central Amazonian affluents and the chemistry of Amazonian waters.