Migração vertical nictemeral das larvas de Macrobrachium amazonicum num lago de 
várzea na Amazônia Central, Ilha do Careiro, Brasil

Moreira, Luiz Carlos; Odinetz Collart, Olga

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Migração vertical nictemeral das larvas de Macrobrachium amazonicum num lago de várzea na Amazônia Central, Ilha do Careiro, Brasil

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Moreira, L. C., & Odinetz Collart, O. (1993). Migração vertical nictemeral das larvas de Macrobrachium amazonicum num lago de várzea na Amazônia Central, Ilha do Careiro, Brasil. Amazoniana: Limnologia et Oecologia Regionalis Systematis Fluminis Amazonas, 12(3/4), 385-398.

Cite as: http://hdl.handle.net/21.11116/0000-0004-8930-B

Abstract

Prawn larvae of Macrobrachium amazonicum have been collected during six diel cycles in the epilimnion (surface and 2 m) from three different habitats of the Lago do Rei, Careiro Island. The larval distribution showed a significant increase in density at 22 hours regardless of season or habitat, which suggests a diel vertical migration pattern. The thermal stratification of the lake (mean differential of 0.5 °C between the surface and 2 m and 0.6 °C between 2 m and 4 m) suggests that this phenomena could be only partly related to a metabolic efficiency resulting from prawns residing at cooler depths during the day. In shallow tropical waters, predation by visually dependent planktivores can be a more important factor in the adaptative significance of the diel distribution of the macrozooplankton than a low thermal stratification. The diurnal feeding activity found in the predominant planktivores fish species of the Careiro lake reinforces this hypothesis.