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The resting eggs of zooplankton from a tropical, eutrophic reservoir (Pampulha Reservoir, south-east Brazil)

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Abstract:

Abstract

Resting eggs of rotifers and cladocerans were collected within 5 cm of sediments from the eutrophic Pampulha Reservoir. All the collected species were successfully hatched and reared in the laboratory. Although the hatching success of rotifer eggs was high (60–80%), it constituted only about 10% of the level of cladoceran eggs. The egg abundance in Pampulha Reservoir varied from 203.2 × 103 eggs m−2 to 80 × 103 eggs m−2. The low densities of resting eggs suggest that the recovery activities directed to the reservoir, such as constant dredging of the sediment, might be affecting this potential genetic pool and, consequently, the maintenance of the remaining and pioneer zooplanktonic populations.

Keywords: Brazil; reservoir; resting eggs; tropical; zooplankton

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1440-1770.2003.00229.x

Affiliations: 1: Federal University of Minas Gerais, Laboratory of Zooplankton Ecology, ICB/Bl, I3/253, Avenue Antônio Carlos, 2267. Pampulha, Belo Horizonte, Brazil. 31270–901, and 2: UFRN, Centro de Biociências, Departamento de Oceanografia e Limnologia, Via Costeira, s/n. Praia de Mãe Luiza, Natal, RN, Brazil. 59014-100.

Publication date: September 1, 2003

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