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The relationship between the water level of the Amazon River and the fate of the zooplankton population in lago Jacaretinga. A Várzea Lake in the Central Amazon∗

1978; Taylor & Francis; Volume: 13; Issue: 2 Linguagem: Inglês

10.1080/01650527809360533

1744-5140

Gerd‐Oltmann Brandorff, Elsa Rodrigues de Andrade,

Aquatic Ecosystems and Biodiversity

Summary In a várzea lake of the Central Amazon the planktonic crustaceans disappear almost completely after the inflow of suspension‐rich Amazon water. An initial small increase in numbers of individuals is accompanied by increased egg production in Diaphanosoma sarsi and Notodiaptomus amazonicus, suggesting an improved food supply for the Zooplankton. Possible reasons for the complete disappearance of the crustaceans are discussed, these being a dilution effect, flushing out of the plankton by the current, and predation of planktivorous fish.